Consulta: creatorFacets:"Spoel, S. van der"
Registros recuperados: 51
Data/hora: 05/06/2024 18:30:26

Pteroxena papillifera n. gen., n. sp., an endoparasitic organism (Copepoda?) from the gymnosomatous pteropod, Notobranchaea
Provedor de dados: Naturalis Digital Academic Repository
Autores: Stock, J.H.; Spoel, S. van der.
A single specimen of a strongly transformed, endoparasitic organism was found on the gymnosomatous pteropod Notobranchaea macdonaldi Pelseneer morpha pelseneeri Pruvot-Fol off Delaware Bay in the north-western Atlantic Basin. The parasite is described as Pteroxena papillifera n. gen., n. sp., and is provisionally attributed to the subclass Copepoda of the Crustacea.
Tipo: Article / Letter to the editor
Ano: 1976
URL: http://www.repository.naturalis.nl/record/505530

The structure of the columellar muscle system in Clio pyramidata and Cymbulia peroni (Theocosomata, Gastropoda). With a note on the phylogeny of both species
Provedor de dados: Naturalis Digital Academic Repository
Autores: Pafort-van Iersel, Trudy; Spoel, S. van der.
The phylogenetic relation between Clio pyramidata Linnaeus, 1767, and Cymbulia peroni De Blainville, 1818, has been studied with regard to the structure of their muscle systems. Specimens of both species collected from the North Atlantic Ocean and the Mediterranean were sectioned 5 µm thick and stained with Haematoxilin-Eosin, Crossmon or Azan for histological purposes or they were studied as cleared dissected or entire animals. The columellar muscle and subectodermal wing muscles of both species are described. It is concluded that Clio shows neoteny since it develops without metamorphosis. The asymmetry in anatomy proves that both Clio and Cymbulia descend from spiralised ancestors. For Clio two primitive characters are discussed which may be due to the...
Tipo: Article / Letter to the editor
Ano: 1979
URL: http://www.repository.naturalis.nl/record/504496

Are Pteropods really Ptero-pods? (Mollusca, Gastropoda, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
The columellar muscle system consists anteriorly of a high number of longitudinal branches surrounding a hydrocoel, which forms higher up two lateral, one ventral and four smaller dorsal bundles. These bundles enter the muscular envelope of head and nuchal region, which is formed out of the wing-wall muscles. The two lateral bundles proceed farest apically to insert on the buccal appendages; the four dorsal fibres fuse with the walls of buccal organs and oesophagus, while the ventral muscles run into the posterior and lateral footlobes. The wings are attached to the body by an extra right and left muscle neither derived from the columellar nor from the wing-wall muscle system. So the posterior and lateral footparts are mesopodal, the wings epipodal and the...
Tipo: Article / Letter to the editor
Ano: 1982
URL: http://www.repository.naturalis.nl/record/505289

Strobilation in a mollusc; the development of aberrant stages in Clio pyramidata Linnaeus, 1767 (Gastropoda, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
The occurrence of aberrant stages in the protandric hermaphrodite Clio pyramidata is considered in relation to the sexual cycle of this species. The anatomy of the juveniles, males and females is shortly discussed especially with regard to their sexual organs. The anatomy of the developing (the normal-complete) and of the growingaberrant stage is briefly reviewed. It is shown that the aberrant stage is formed by strobilation of a normal specimen, probably as a result of less favourable environmental conditions. As the most important conclusions it can be stated that: 1) the aberrant stage described by van der Spoel (1962) is a normal stage in the life cycle; 2) the aberrants are most abundant in the population in the months before the reproductive peaks;...
Tipo: Article / Letter to the editor
Ano: 1973
URL: http://www.repository.naturalis.nl/record/504282

Preliminary note on variation of protoconchae of Clio pyramidata (Linnaeus, 1767) (Mollusca, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
A new method for the use of infraspecific variation in the characterization of watermasses in the past is indicated. The various formae of the thecosomatous pteropod Clio pyramidata can be distinguished by the size of their protoconch. Since in marine sediments these protoconchae are usually the most intact part of the pteropod shells, they can be used to trace the distribution of the formae in the past, and thus of the watermasses of which these are characteristic.
Tipo: Article / Letter to the editor
Ano: 1975
URL: http://www.repository.naturalis.nl/record/505468

Pneumodermopsis teschi n. sp., and notes on some other Pteropoda of the “Thor” Expeditions 1903-1910 (Gastropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
Part of the “Thor” collections are studied, with the aid of notes by Dr. J.J. Tesch. A new species, Pneumodermopsis (Pn.) teschi, is described, and the variability of some taxonomic characters in Thliptodon are mentioned. A distributional map for the “Thor” records, based on material from the collection of the Zoological Museum in Copenhagen and on the notes left by Tesch, is provided.
Tipo: Article / Letter to the editor
Ano: 1973
URL: http://www.repository.naturalis.nl/record/505400

Peraclis valdiviae from the Banda Sea (Mollusca, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
The shell of Peraclis valdiviae (Meisenheimer, 1905) from Banda Sea specimens proved to be of a slender Peraclis bispinosa-like type. The specimens showed a very shallow distribution in the Banda Sea due to relatively high deep-water temperatures and vertical mixing.
Tipo: Article / Letter to the editor
Palavras-chave: Pteropoda; Peraclis valdiviae; Vertical distribution; Banda Sea.
Ano: 1992
URL: http://www.repository.naturalis.nl/record/504469

Finer sculptures in euthecosomatous shells, and their value for taxonomy (Mollusca, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
The protoconch in Limacina helicoides, Peraclis moluccensis, Styliola subula, Cavolinia globulosa, C. gibbosa, C. inflexa and C. longirostris are described; finer structures of the shell in these species and Hyalocylis striata, Diacra quadridentata and Cavolinia tridentata are described. The occurrence of a distinct protoconch-I and -II in Cavoliniidae is discussed as well as the taxonomic value of the structure of the ventral ribs in the Cavoliniidae mentioned.
Tipo: Article / Letter to the editor
Ano: 1976
URL: http://www.repository.naturalis.nl/record/505087

Variation in the Diacria trispinosa group, new interpretation of colour patterns and description of D. rubecula n. sp. (Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Bontes, B.; Spoel, S. van der.
The development of the initial stages of the colour pattern on the ventral shell side in the eight taxa of the Diacria trispinosa group is studied. A new species: D. rubecula, is split off from D. maculata on the basis of the discriminating value of these initial colour patterns. The relation of the taxa in the group is discussed and their distributions are compared.
Tipo: Article / Letter to the editor
Palavras-chave: Biogeography; Speciation; Pteropods; Colour patterns.
Ano: 1998
URL: http://www.repository.naturalis.nl/record/505347

Notes on some Pteropods from the North Atlantic
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
A number of samples collected by the Scotia and Explorer Expeditions in 1950 in the North Atlantic were found among undetermined material left by Dr. J. J. TESCH after his death in 1954. Some interesting specimens in these samples seem to justify their publication. My grateful acknowledgements are tendered to Dr. J. H. FRASER of the Marine Laboratory at Aberdeen, for so kindly giving me full information concerning the samples. The author is also very much indebted to Dr. C. O. VAN REGTEREN ALTENA who lent the material of both expeditions, which is part of the collection of the Leiden Museum. Table I gives an enumeration of the species met with and the data concerning the stations. In Fig. 1 the stations are given together with surface currents.
Tipo: Article / Letter to the editor
Ano: 1964
URL: http://www.repository.naturalis.nl/record/505116

List of discrete depth samples and open net hauls of the Amsterdam Mid North Atlantic Plankton Expeditions 1982 and 1983 (Project 101A)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
The technical details and hydrographie data of the hauls with open nets and opening-closing nets made during the Amsterdam Mid North Atlantic Plankton Expeditions (AMNAPE) in 1982 and 1983 are given together with the general conditions during the sampling periods: 1-27 February 1982 and 27 May – 24 June 1983. Temperature and salinity profiles and correlations are given for the sampled area roughly between 55°N 30°W and 24°N 30°W.
Tipo: Article / Letter to the editor
Ano: 1985
URL: http://www.repository.naturalis.nl/record/505539

Clio pyramidata Linnaeus, 1767 forma convexa (Boas, 1886) (Mollusca, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
The pelagic fauna of the Red Sea shows special variation induced by its isolated character (Van der Spoel, 1971). Clio pyramidata from the Red Sea is usually incorrectly referred to as the tropical forma lanceolata (Lesueur, 1813) or the typical forma pyramidata Linnaeus, 1767. Some large samples with C. pyramidata from the northern Red Sea made it possible to establish the correct identity of these populations. Though special variation, like described for Diacria and Cavolinia species (Van der Spoel, l.c.), is found for Red Sea populations of C. pyramidata, the populations are not separated as an endemic taxon as the specimens resemble closely Clio pyramidata forma convexa (Boas, 1886) (figs. 1-4). The anterior parts are almost identical to those of...
Tipo: Article / Letter to the editor
Ano: 1973
URL: http://www.repository.naturalis.nl/record/505325

New forms of Diacria quadridentata (de Blainville, 1821), Cavolinia longirostris (de Blainville, 1821) and Cavolinia uncinata (Rang, 1829) from the Red Sea and the East Pacific Ocean (Mollusca, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
Two subspecies new to science: Diacria quadridentata erythra and Cavolinia uncinata pulsatapusilla are described from the Red Sea. The formae: D.q. quadridentata forma schmidti, D.q. erythra forma erythra, D.q.e. forma crassa, C. longirostris forma flexipes, C. uncinata pulsalapusilla forma pulsatapusilla and C.u.p. forma pulsatoides new to science are described from the Pacific Ocean and Red Sea.
Tipo: Article / Letter to the editor
Ano: 1971
URL: http://www.repository.naturalis.nl/record/504961

List of discrete depth samples and open net hauls of the Amsterdam Mid North Atlantic Plankton Expedition 1981 (Project 101A)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der; Meerding, A.G.H.A.
The technical details and hydrographical data of the hauls with open nets and opening-closing nets, made during the Amsterdam Mid North Atlantic Plankton Expedition, are given, together with the general conditions during the sampling period September 15 – October 6, 1981. Temperature and salinity profiles are given for the sampled area roughly between 55°N 30°W and 24°N 30°W and between 24°N 30°W and 27°N 20°W.
Tipo: Article / Letter to the editor
Ano: 1983
URL: http://www.repository.naturalis.nl/record/505427

Annotated species list of the Mollusca, Tintinnida, Amphisolenia (Dinoflagellata) and Radiolaria collected in pump samples by the Amsterdam Mid North Atlantic Plankton Expeditions, 1980-1983 (Proj.101 A)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
The mid North Atlantic between 24°N and 55°N along 30°W and between 20°W and 30°W along approx. 25°N, investigated by the AMNAPE cruises in the four seasons, spring (1980), summer (1983) autumn (1981) and winter (1982), is dominated by Temperate waters with a northern and southern branch of the North Atlantic Drift, Subtropical Sargasso Sea waters in the south and Subarctic waters in the north (Yen der Spoel, 1981, 1986; Van der Spoel &amp; Meerding 1983; Pafort- van Iersel, 1985). The present study gives the relation of the microplankton distribution in the upper 5m of the water column with the hydrography and seasons.
Tipo: Article / Letter to the editor
Ano: 1987
URL: http://www.repository.naturalis.nl/record/506328

Two new forms of Cavolinia uncinata (Rang, 1829) (Pteropoda, Gastropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
In the species Cavolinia uncinata two new forms are described, one from the Atlantic and one from the Indian Ocean. The reason why the species is not subdivided into subspecies but into formae is explained.
Tipo: Article / Letter to the editor
Ano: 1969
URL: http://www.repository.naturalis.nl/record/504918

Notes on the identification and speciation of Heteropoda (Gastropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
INTRODUCTION Specimens of Heteropoda, especially of Atlantidae, which are damaged by the nets and have lost their shells by the action of preservatives are usually considered to be hardly identifiable. Tokioka (1961) used the opercula as a new source of morphological information for the study of the shell-less Atlantidae. The laborious preparation of opercula enables only the identification of some species. The occurrence of groups of closely related taxa showing only slight morphological differences is responsible for other difficulties in identification. Recent expeditions, like the Cicar Expedition, the Eastropac Expeditions and the Acre project provided samples with large quantities of damaged heteropods, which induced me to look for a simple method to...
Tipo: Article / Letter to the editor
Palavras-chave: 42.73.
Ano: 1972
URL: http://www.repository.naturalis.nl/record/319387

Variation in Cavolinia longirostris (De Blainville, 1821) from the Pacific Ocean with description of a new forma (Mollusca, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
Cavolinia longirostris forma mcgowani nov. forma is described from the Pacific Ocean.
Tipo: Article / Letter to the editor
Ano: 1973
URL: http://www.repository.naturalis.nl/record/505348

Neue Fundorte und Variabilität der Xerobdella anulata Autrum, 1958 (Hirudinea, Haemadipsidae)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Dresscher, Th.G.N.; Engel, H.; Spoel, S. van der.
Es wird Xerobdella-Material aus 11 neuen Fundorten in Jugoslawien erwähnt. Wir wissen leider noch nicht genug über die Variabilität der beiden Xerobdella-Arten (X. lecomtei und X. anulata) um mit Sicherheit sagen zu können ob hier zwei Arten oder zwei Subspecies einer Art vorliegen. Je mehr Exemplare bekannt werden, desto grösser erscheint die Variabilität. Es ist nicht sicher ob wirklich bei allen als X. lecomtei beschriebenen Tieren genau die Zahl der Ringe zwischen den Genitalöffnungen gezählt worden ist. Unsere Exemplare zeigen 4 bis 5 Ringe, während Autrum nur 4½ Ringe für X. anulata angab, dagegen 3 bis 3½ Ringe für X. lecomtei. Vorläufig nennen wir unsere Tiere darum Xerobdella anulata Autrum, 1958, die vermutlich südlich der Julischen Alpen vorkomme.
Tipo: Article / Letter to the editor
Ano: 1966
URL: http://www.repository.naturalis.nl/record/505169

Geographical variation in Cavolinia Tridentata (Mollusca, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
A redescription is given for five formae of Cavolinia tridentata and four formae new to science are described. The distribution of the species is given and the zoogeography of the formae is discussed.
Tipo: Article / Letter to the editor
Ano: 1974
URL: http://www.repository.naturalis.nl/record/504420

Sense organs in Spongiobranchaea australis d’Orbigny, 1835 (Gastropoda, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
The sense organs: the labial tentacles, eyes, rhinophores, osphradium and statocysts of Spongiobranchaea australis d’Orbigny, 1835 are described together with their innervation. The descriptions are based on serial sections of three animals.
Tipo: Article / Letter to the editor
Ano: 1964
URL: http://www.repository.naturalis.nl/record/504903

Variation in Cavolinia inflexa (Lesueur, 1813) (Gastropoda: Pteropoda: Euthecosomata)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der; Pierrot-Bults, A.C.
Cavolinia inflexa (Lesueur, 1813) proves not to be composed of subspecies or formae, or to show clinal variation. Maximum shell length varies between 4 and 7 mm, shell width between 2 and 4 mm, length/width ratio between 0.51 and 0.81. A geographic pattern in the occurrence of different length/width ratios, on which the subdivision of this species was always based in literature, could not be found. Frequency analyses of length for all samples combined did not show subdivision in local populations and length/width ratios over all samples did show only a pattern of shell growth. There is no valid ground for the subdivision of the species into different taxa.
Tipo: Article / Letter to the editor
Palavras-chave: Variation; Taxonomy; Distribution; Cavolinia; Pteropoda.; 42.73.
Ano: 1998
URL: http://www.repository.naturalis.nl/record/317673

A new taxonomic and zoogeographic interpretation of the Diacria quadridentata group (Mollusca, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Leyen, A. van; Spoel, S. van der.
Re-examination of the Diacria quadridentata species group based upon morphology of the shell and zoogeographic data, led to a new classification comprising the recent taxa: D. quadridentata, D. costata with an equatorial and a central water form, D. danae with an equatorial and a central water form, D. schmidti schmidti, D. erythra crassa and the fossil taxa D. schmidti cocidentalis and D. erythra erythra from surface sediments. A method has been developed to estimate the relative age of the population, based on the development of shell and soft parts. Shell growth in the period of minute and adult stages together does not exceed 0.2 mm, and differs from species to species.
Tipo: Article / Letter to the editor
Ano: 1982
URL: http://www.repository.naturalis.nl/record/505420

Willem Lodewijk van Utrecht in memoriam
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
After a few years of serious illness Dr. W. L. van Utrecht, born 13 December 1926 in Tiel, died still very unexpected at the age of 67 year on 10 August 1994. After a study of chemistry and biology he joined from 1952 till 1963 the working group for Cetacea of the Netherlands Organisation of Applied Sciences (TNO), and the University of Amsterdam in the periods 1953-1956 and 1963-1988. In the season 1953/54 his first large expedition took place with the catcher “Enern”, a three month trip for whale marking, and two month visit to South Georgia. As an inspector he made a cruise to the Antarctic ocean with the Dutch whalefactory ship “Willem Barendsz” in the seasons 1959/1960 and as a scientist in the period 1962/1963. In 1966 he got his PhD at the same day...
Tipo: Article / Letter to the editor
Ano: 1994
URL: http://www.repository.naturalis.nl/record/505367

Preliminary note on the pump samples of the Amsterdam Mid North Atlantic Plankton Expedition 1980 (Project 101A)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der; Goessens, F.
Pump samples filtered from the sea-water tap have been used to determine microplankton volumes, species diversity and faunal composition in the different water masses sampled by the Amsterdam Mid North Atlantic Plankton Expedition between 55°N 30°W and 24°N 30°W in the period 9 April – 6 May 1980. The presence of a plankton bloom south of 40°N could be demonstrated. Six faunal assemblages are distinguished, viz.: Subarctic, Cold Temperate, Warm Temperate, N. Sargasso Sea, S. Sargasso Sea and a more Tropical assemblage. Some traces of upwelling near 55°, 48° 38° and 30°N could be demonstrated by the presence of benthic Foraminifera in these shallow samples. A list of samples is provided.
Tipo: Article / Letter to the editor
Ano: 1986
URL: http://www.repository.naturalis.nl/record/505514

From Cavolinia longirostris to twenty-four Diacavolinia taxa, with a phylogenetic discussion (Mollusca, Gastropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der; Bleeker, J.; Kobayasi, H.
The six already known infraspecific taxa in Cavolinia longirostris (De Blainville, 1821), presently in the genus Diacavolinia, are raised to species rank and sixteen species and two formae new to science are described in this genus from different oceanic areas. Some shell structures in the Cavoliniinae are described for the first time and the phylogeny of the group is discussed.
Tipo: Article / Letter to the editor
Palavras-chave: Taxonomy; Pteropoda; Cavoliniidae; Diacavolinia; New species; Phylogeny.
Ano: 1993
URL: http://www.repository.naturalis.nl/record/503859

Macrozooplankton diversity: how much do we really know?
Provedor de dados: Naturalis Digital Academic Repository
Autores: Pierrot-Bults, A.C.; Spoel, S. van der.
Pelagic species are widely distributed in a horizontal plane and have three-dimensional distributions, since the sea covers about 70% of the surface of the earth, and on average 4 km deep. For most macrozooplankton and micronekton groups there seems to be no great expectations of finding new taxa with the exception of gelatinous groups and of the deep sea, which is a relatively unknown especially in the benthopelagic zone close to the sea-bed. However, we do not know very much about variation, either morphological or genetical, within socalled species in different parts of their range. We think we are dealing with single very broadly distributed species, which, in reality, are species complexes consisting of several more or less cryptic species or...
Tipo: Article / Letter to the editor
Palavras-chave: Pelagic macrozooplankton/micronekton diversity; Biogeographic patterns; Genetic variation; Morphological variation; Cryptic species; 42.79.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/220316

Sagitta batava n.sp. from the Scheldt Estuary, the Netherlands (Chaetognatha)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Biersteker, Rinie H.; Spoel, S. van der.
A new species of Chaetognatha, Sagitta batava, is described. The morphological differences between this new species and closely related ones, especially S. setosa, are given. Ecological and meristic data concerning S. batava are reported.
Tipo: Article / Letter to the editor
Ano: 1966
URL: http://www.repository.naturalis.nl/record/505097

Pelagic nemerteans of the Amsterdam Mid North Atlantic Plankton Expeditions (AMNAPE), 1980-1983
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
From the Mid North Atlantic Ocean 18 species of Nemertinea are reported, two of which are new for the Atlantic, six are new for the North Atlantic. One specimen was the first male to be described of Dinonemertes investigatoris. For Nectonemertes mirabilis a seasonal shift in distribution is found with very shallow (300 m) occurrence in winter and spring north of 41° N. The other species were all collected in hauls below 500 m.
Tipo: Article / Letter to the editor
Ano: 1985
URL: http://www.repository.naturalis.nl/record/505145

Medusae of the genera Paraphyllina, Periphylla and Atolla from the Amsterdam Mid North Atlantic Plankton Expeditions (1980-1983)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
The vertical distribution patterns of Paraphyllina ransoni Russell, 1956, Periphylla periphylla (Péron &amp; Lesueur, 1809), Atolla parva Russell, 1958, A. vanhoeffeni Russell, 1957, and A. wyvillei Haeckel, 1880 are described. A comparison with other bathypelagic taxa shows that there are various upper limits to be drawn for the bathypelagic area. Four typically different vertical distribution patterns are described.
Tipo: Article / Letter to the editor
Ano: 1987
URL: http://www.repository.naturalis.nl/record/504330

Clio piatkowskii, a mesopelagic pteropod new to science (Gastropoda, Opisthobranchia)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der; Schalk, P.H.; Bleeker, J.
A pteropod species new to science: Clio piatkowskii is described from benthopelagic samples taken in high Antarctic waters of the Weddell Sea. Comparisons with related species are made and its taxonomic place in the genus Clio is discussed.
Tipo: Article / Letter to the editor
Palavras-chave: Gastropoda; Pteropoda; Clio; Taxonomy; Plankton; Antarctica.
Ano: 1992
URL: http://www.repository.naturalis.nl/record/504812

Protopelagonemertes joculatori n.sp., a pelagic nemertean from Indonesian waters
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
From the Banda Sea a new nemertean, Protopelagonemertes joculatori n.sp., is described. Although collected from rather shallow depths of 400-500 m, it may appear to be a bathypelagic form.
Tipo: Article / Letter to the editor
Ano: 1988
URL: http://www.repository.naturalis.nl/record/505204

Catalogue of the type specimens of Tunicata in the Zoological Museum in Amsterdam
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
The types of 360 nominal species of Tunicata present in the Zoological Museum in Amsterdam are listed, for some species lectotypes are indicated.
Tipo: Article / Letter to the editor
Ano: 1969
URL: http://www.repository.naturalis.nl/record/505464

The shell and its shape in Cavoliniidae (Pteropoda, Gastropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
The shape of the shell in Cavoliniidae is studied in relation with the floating capacity of the specimens. A formula for this capacity (F) is given. The value for F proved to be higher in more specialized species and de.nendent on environmental conditions.
Tipo: Article / Letter to the editor
Ano: 1968
URL: http://www.repository.naturalis.nl/record/505220

Catalogue of the Polychaeta collected by the Siboga Expedition and type specimens of Polychaeta in the Zoological Museum of Amsterdam
Provedor de dados: Naturalis Digital Academic Repository
Autores: Bleeker, J.; Spoel, S. van der.
The polychaetous worms collected by the Siboga-Expedition (1899-1900) are listed with some annotations. A few specimens – identified by Augener and Pettibone but never published – are added, so that this list gives a complete survey of all Polychaeta collected by the mentioned expedition. The types of 269 nominal species present in the Institute of Taxonomic Zoology (Zoological Museum), Amsterdam are incorporated in this list, for some species lectotypes are desinated.
Tipo: Article / Letter to the editor
Ano: 1992
URL: http://www.repository.naturalis.nl/record/505308

A new forma of the species Clio pyramidata Linnaeus, 1767 and a new resting-stage of Clio pyramidata Linnaeus, 1767 forma sulcata (Pfeffer, 1879) (Gastropoda, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
A new form is described in the polytypic species Clio pyramidata LINNAEUS, 1767. This new forma excisa was found at 57°31'S 02°56'W and it is related to the forms convexa (BOAS, 1886) and sulcata (PFEFFER, 1879). The shape of the shell of the new form excisa shows a great resemblance to the shape of the shell of these two forms and also a resemblance is present to the shape of the shell of the form martensii (PFEFFER, 1880). This resemblance, however, may indicate a relationship as well as a parallel development. The new forma and the form martensii live in the same area, so that the chemo-physical characteristics of the water may have caused a parallel development. As indicated in a previous paper, the polytypic species Clio pyramidata consists of several...
Tipo: Article / Letter to the editor
Ano: 1963
URL: http://www.repository.naturalis.nl/record/504828

Pneumoderma heronensis nov. sp.: A new Pteropod (Opisthobranchia; Gymnosomata) from Australian waters
Provedor de dados: Naturalis Digital Academic Repository
Autores: Newman, L.J.; Spoel, S. van der.
In April 1987, seven specimens of a new species of the gymnosomatous pteropod, Pneumoderma heronensis, were collected from surface waters between Heron and Wistari Reefs, southern Great Barrier Reef, Australia (23° 27’S 151° 55’E). Additional specimens were identified from CSIRO plankton collections from the Northwest Shelf, Western Australia (19° 25’S 119° 30’E). This new species is described and illustrated from living specimens. Uniquely, P. heronensis possess 12 lateral buccal arm suckers, arranged alternately in two rows. Morphological comparisons are made with closely related species; P. mediterraneum (Van Beneden, 1838), P. atlanticum atlanticum (Oken, 1815) forma eurycotylum (Meisenheimer, 1905) and P. degraafíi Spoel &amp; Pafort-van Iersel, 1982.
Tipo: Article / Letter to the editor
Ano: 1989
URL: http://www.repository.naturalis.nl/record/505498

Pneumoderma degraaffi n.sp., a Pteropod new to science (Mollusca Opisthobranchia)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der; Pafort-Van Iersel, Trudy.
Description of Pneumoderma degraaffi n.sp., from Sargasso Sea water, at 28°23.5'N 29.°55.9'W, related to P. a. atlanticum forma pygmaeum (Tesch, 1913) and P. mediterraneum (Van Beneden, 1838).
Tipo: Article / Letter to the editor
Ano: 1982
URL: http://www.repository.naturalis.nl/record/505360

List of discrete depth samples and open net hauls of the Amsterdam Mid North Atlantic Plankton Expedition 1980 (project 101A)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
The technical details and hydrographical data of the hauls with open nets and opening-and-closing nets, made during the Amsterdam Mid North Atlantic Plankton Expedition are given together with the general conditions during the sampling period April 11 – May 2, 1980. A temperature and salinity profile between 55° and 25°N to a depth of 2000 m are presented with ten XBT records.
Tipo: Article / Letter to the editor
Ano: 1981
URL: http://www.repository.naturalis.nl/record/505292

Clio bartletti n.sp., a fossil new to science closely related to Clio cuspidata (Gastropoda, Thecosomata)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
Clio bartletti n. sp. is described from a sediment sample containing a mixture of late Pleistocene and recent pelagic and benthic sediment. The sample is described and correlated with climatic fluctuations using protoconch size as a temperature indicator. In all probability the new species is an Alleröd fossil.
Tipo: Article / Letter to the editor
Ano: 1978
URL: http://www.repository.naturalis.nl/record/505528

Growth, reproduction and vertical migration in Clio pyramidata Linné, 1767 forma lanceolata (Lesueur, 1813), with notes on some other Cavoliniidae (Mollusca, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
Shell growth and size variation in populations of Diacria trispinosa Clio pyramidata, Cuvierina columnella, and Cavolinia gibbosa are studied. Attention is given to differences in the size variations of the four species caused by differences in their developmental biology. The reproductive cycle of Clio pyramidata forma lanceolata in the Bermuda Area is described and it is shown that there are more than one protandric hemaphrodite sexual cycles in one animal. The vertical migration of the four mentioned species is discussed.
Tipo: Article / Letter to the editor
Ano: 1973
URL: http://www.repository.naturalis.nl/record/505038

Meridionalis, a valid forma in Clione limacina (Phipps, 1774) (Gastropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
Clione limacina (Phipps, 1774) var. meridionalis Pruvot-Fol, 1926, is considered to be a forma endemic to the Sargasso Sea.
Tipo: Article / Letter to the editor
Ano: 1973
URL: http://www.repository.naturalis.nl/record/505449

The Vascular System in the Kidneys of the Common Porpoise (Phocoena phocoena (L.))
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
Studying the kidneys of the Common Porpoise and the Fin Whale it was found that there is a second venal system next to the normal venal system. The arterial and venal system as found in the kidneys of the dog are present in the kidneys of the Common Porpoise without typical differences but there is also a venal system situated outside the renculi which conducts the blood from the venae arcutae to the vene cava. This system is found in the kidneys of the Common Seal but here it is replacing the system of the vena renalis which it does not do in the kidneys of the Common Porpoise. In the kidneys of the Common Porpoise and the Fin Whale both the plexus which surround the pelvic cavity and the ureter are present and they show to be nearly similar to those...
Tipo: Article / Letter to the editor
Ano: 1963
URL: http://www.repository.naturalis.nl/record/504544

First records of fossil gymnosomatous protoconchae (Pteropoda, Gastropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der; Diester-Haass, L.
Fossil protoconchae of an unknown gymnosomatous pteropod are described from Late Pleistocene sediments.
Tipo: Article / Letter to the editor
Ano: 1976
URL: http://www.repository.naturalis.nl/record/505440

Diacavolinia nov. gen. separated from Cavolinia (Pteropoda, Gastropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
Diacavolinia is described to comprise Cavolinia longirostris, a species which throws off the protoconchs-I and -II while the species of Cavolinia keep the protoconch in the adult stage. Phylogeny of the Cavoliniidae is discussed.
Tipo: Article / Letter to the editor
Ano: 1987
URL: http://www.repository.naturalis.nl/record/505451

A biosystematic basis for pelagic biodiversity
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der.
Biodiversity can be considered to be a human appreciation of the biological entity diversity. Diversity can be expressed numerically on the basis of taxa found, but it can also be expressed as the contribution of a specimen to the diversity, for which a formula is proposed. Diversity is the sum of the taxonomic or numerical diversity, and the ecological, genetical, historical, and phylogenetic diversity. Moreover, each group, or larger taxon, has its own characteristic diversity. These types of diversity are considered separately. One formula is tentatively proposed to calculate the overall diversity. Diversity in nature is variable, which is demonstrated in a diagram for comparison with societyinduced diversity changes. Diversity in the pelagic fluctuates...
Tipo: Article / Letter to the editor
Palavras-chave: Biodiversity; Diversity calculation; Ecology; Pelagic; Phylogeny.
Ano: 1994
URL: http://www.repository.naturalis.nl/record/504018

Juveniles of Cavolinia inflexa (Lesueur, 1813) and Cavolinia longirostris (de Blainville, 1821), their discrimination and development (Gastropoda, Pteropoda)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Troost, D.G.; Spoel, S. van der.
In C. inflexa the mantle gland and its border show twenty-two bands. Differences in banding with C. longirostris are discussed. It appeared to be possible to discriminate the soft parts of juveniles in both species. Of special value for discrimination is the shape of the lateral appendages. The shells can be distinguished by the relative length of the caudal spine, which is longer in C. inflexa than in C. longirostris. Different developmental stages of C. longirostris are described and those of C. inflexa are added for comparison. While for the latter species the soft parts grow larger parallel with the increment of the shell, this is not the case in C. longirostris, due to the occurrence of minute stages and shedding of the caudal spine. The differences...
Tipo: Article / Letter to the editor
Ano: 1972
URL: http://www.repository.naturalis.nl/record/505296

Medusae of the Amsterdam Mid North Atlantic Plankton Expeditions (1980-1983) with description of two new species
Provedor de dados: Naturalis Digital Academic Repository
Autores: Bleeker, J.; Spoel, S. van der.
The medusa fauna of the mid North Atlantic Ocean between 24° and 55° N along approximately 30° W is studied. Two Hydromedusae new to science, Oceania tydemani and Annatiara lempersi, are described. The differences in fauna south and north of 42° N, and faunal borders near 50°, 48°, 45°, 35°, 30°, and 34°-37° N are discussed. The vertical distribution and for some species the diurnal migration and subtropical submergence are recorded.
Tipo: Article / Letter to the editor
Ano: 1988
URL: http://www.repository.naturalis.nl/record/504150

Samplelist of the Cicar (Cooperative Investigations in the Caribbean and Adjacent Regions) cruises 1970 – 1972
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der; Koperdraat, M.J.
The Royal Dutch Navy participated in the cruises of the Cooperative Investigations in the Caribbean and Adjacent Regions (Cicar) from 1970 up to 1973 with H.Nl.M.S. “Luymes” and made 39 cruises. For general information on these cruises and preliminary results one is referred to the titles in the list of literature marked with a asterisk. Plankton collecting was executed by the ornithologists Drs. S. van Halewijn and Drs. D.M.C. Poppe and when ornithologists were not aboard the crew of the researchship did valuable work by continuing sampling. As plankton samples could in many cases not be correlated with the official Cicar Stations new numbers are added when possible. Confusion of the numbers is impossible as the new numbers are single numbers, the...
Tipo: Article / Letter to the editor
Ano: 1974
URL: http://www.repository.naturalis.nl/record/506372

Probable Mesozoic vicariance in the biogeography of Euphausiacea
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der; Pierrot-Bults, A.C.; Schalk, P.H.
The worldwide distribution of Euphausiacea is related to differences in character states found in the genera belonging to this order. An area cladogram is composed. The vicariant events postulated in this study made it possible to distinguish between different “hydroplates” of the “hydrotectonic (cf. Nelson, 1986) system” on the basis of general trends in distribution of these genera.
Tipo: Article / Letter to the editor
Palavras-chave: Euphausiacea; Biogeography; Vicariance.
Ano: 1990
URL: http://www.repository.naturalis.nl/record/504564

Distribution of Myctophidae (Pisces, Myctophiformes) during the four seasons in the mid North Atlantic
Provedor de dados: Naturalis Digital Academic Repository
Autores: Spoel, S. van der; Bleeker, J.
The distribution, temperature, and size ranges of 60 species of myctophids in the North Atlantic between 55°N and 24°N along approximately 30°W are recorded for the four seasons. The general zoogeography and migration is discussed. Faunal groups of species, faunal borders, and transition zones near 50°N, 41 °N, and 29°N for myctophids are distinguished and discussed.
Tipo: Article / Letter to the editor
Palavras-chave: Myctophidae; Biogeography; North Atlantic; Faunal borders.
Ano: 1991
URL: http://www.repository.naturalis.nl/record/504270