SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Artois, T.J.; Schockaert, E.R..

The taxonomy of the genus Polycystis Koelliker, 1845 sensu Schockaert & Karling, 1975 is discussed. Character analysis reveals the monophyletic state of the three species groups these authors defined within it. As no synapomorphies for the three groups can be found, the genus is split in three genera: Polycystis Koelliker, 1845, Macrorhynchus Graff, 1882 and Paulodora Marcus, 1948. The systematic position of Macrorhynchus yaganus (Marcus, 1954) Evdonin, 1977 is also discussed, resulting in the erection of the new genus Marcusia gen. n.

Anatomy and systematics of some Polycystididae (Turbellaria, Kalyptorhynchia) from the Pacific and S. Atlantic

Palavras-chave: Phylogenetics; Taxonomy; Eukalyptorhynchia; Plathelminthes; Polycystididae; Polycystis.

Ano: 1998

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6815

Karling, T.G.; Schockaert, E.R..

Paraustrorhynchus gen. n., P. pacificus (California), Antiboreorhynchus novzelae sp. n. (New Zealand) and Gyratrix proaviformis sp. n. (Oregon) are described as new taxa. Additional notes are given on Gyratrix hermaphroditus Ehrbg. (new localities on the N. American Pacific coast), Scanorhynchus forcipatus Karling (new locality in California), Paraustrorhynchus elixus (Marcus) comb. n. and Alcha evelinae Marcus (new localities in California). The taxonomy of the genera and species is discussed. Viewpoints are presented on evolutionary trends and homologous atrial organs in the family Polycystididae.

Anatomy and taxonomy of some species of Polycystididae (Turbellaria, Kalyptorhynchia) from N. Atlantic and Mediterranean coastal areas

Palavras-chave: Polycystididae.

Ano: 1977

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3563

Schockaert, E.R.; Karling, T.G..

Acrorhynchides styliferus sp. n. from Norway and the British Isles and Polycystis contorta sp. n. and Typhlopolycystis coomansi sp. n. from Norway and the Mediterranean are described. Additional notes are given on the anatomy and distribution of Paracrorhynchus bergensis Karling. Polycystis groenlandica (Levinsen), P. crocea (Fabricius) and Typhlopolycystis mediterranea Brunet. The taxonomy of the species and the corresponding genera is discussed.

Palavras-chave: Anatomy Geographical distribution New species Taxonomy Acrorhynchides styliferus Paracrorhynchus bergensis Polycistis crocea Polycystididae Polycystis contorta Polycystis groenlandica Typhlopolycystis coomansi Typhlopolycystis mediterranea ANE; British Isles ASE; Mediterranean Water.

Ano: 1975

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3522

Divergent protonephridial architecture within the Kalyptorhynchia (Platyhelminthes) and the implications for the phylogeny of the Rhabdocoela

Watson, N.A.; Schockaert, E.R..

Free-living Plathelminthes from the Belgian coast and adjacent areas

Ano: 1997

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7011

Schockaert, E.R.; Jouk, P.E.H.; Martens, P.M..

From own observations and data from the literature. a species list is given of the free-living Plathelminthes which occur on the Belgian coast. in the Netherlands Delta area en some localities in Northern France. In the whole area considered over 250 species have been observed more than 150 of them are from Belgian sandy beaches. some sublitoral stations and/or brackish water areas.

Horizontal distribution of the Plathelminthes in a sandy beach of the Belgian coast

Palavras-chave: Platyhelminthes ANE; Belgium ANE; North Sea; Southern Bight.

Ano: 1989

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7365

Jouk, P.E.H.; Martens, P.M.; Schockaert, E.R..

Studies of the horizontal distribution of the Plathelminthes in sandy beaches have up to now mainly been carried out on the German island of Sylt where the beaches consist of a steep "Prallhang" and a flat wadden area. Beaches of the Belgian coast are very flat, only gently sloping and with a different sediment compared to the Sylt beaches. This study reports on the distribution of the turbellarians in such a flat beach; the discussion is mainly focussed on the comparison with the results of the German investigators.

Interstitial fauna of Galapagos: Porrocystidinae (Plathelminthes Polycystididae)

Palavras-chave: Beaches Coastal zone Geographical distribution Horizontal distribution Plathelminthes ANE; Belgium; Belgian Coast.

Ano: 1988

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2990

Artois, T.J.; Schockaert, E.R..

Syndesmis longicanalis sp.nov., an umagillid turbellarian (Plathelminthes) from echinoids from the Kenyan coast

Palavras-chave: New taxa Phylogeny Polycystididae Porrocystidinae ISE; Ecuador; Galapagos I..

Ano: 1999

URL: http://www.vliz.be/imisdocs/publications/238783.pdf

Moens, J.B.; Martens, E.E.; Schockaert, E.R..

A new species of Umalgillid rhabdocoel is described from echinoids from the Kenyan coast. Syndesmis longicanalis sp.nov. is found in the intestine of both Tripneustes gratilla and Toxopneustes pileolus collected near Mombasa. The most stricking characteristic, which distinguishes the new species from all known species of the Syndesmis-Syndisyrinx group is the very long scelotic bursal canal and the three ventral glandular papillae. A more detailed comparison between the specimens from the two different hosts demonstrates that they belong to the same species although some differences are statistically significant.

Observations on the ultrastructure of the copulatory organ of Archilopsis unipunctata (Fabricius, 1826) (Proseriata, Monocelididae)

Ano: 1994

URL: http://www.vliz.be/imisdocs/publications/217167.pdf

Martens, E.E.; Schockaert, E.R..

The copulatory organ in adult specimens of Archilopsis unipunctata has been studied by transmission electron microscopy. This copulatory organ is of the conjuncta-duplex type with eversible cirrus. The seminal vesicle, lined with a nucleate epithelium, is surrounded by spirally arranged muscles. The fibers are enclosed in a sheath that is continuous with the septum of the bulbus and the basement lamina of the male canal epithelium. Distally to the seminal vesicle the bulbus is filled with the secretory cell-necks of the prostate glands. The male canal shows three different parts: seminal duct, ejaculatory duct and eversible cirrus. At the transition of seminal duct and ejaculatory duct two prostate ducts open into the lumen. The...

Observations on the ultrastructure of the proboscis epithelia in Polycystis naegelii Kölliker (Turbellaria Eukalyptorhynchia) and some associated structures

Palavras-chave: Animal reproductive organs; Ultrastructure; Archilopsis unipunctata; Proseriata; Turbellaria [Flatworms].

Ano: 1981

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3407

Schockaert, E.R.; Bedini, C..

The epithelium of the anterior tip of the bodywall, of the proboscis cavity and of the proboscis cone in Polycystis naegelii has been studied with the electron microscope. These epithelia are formed by six syncytial belts separated from each other by cellular limits: one belt belongs to the epidermis, three line the cavity and two cover the cone. The posterior belt of the cavity and those of the cone are of the insunk type bringing about a peculiar relationship between the latter two. Moreover, they are associated with muscular elements under the basal cone belt but above its basement membrane. Nine different kinds of glands have been observed erupting at the surface of the epithelia in the studied area, while six different sorts of...

On the anatomy of Gnosonesima mediterranea sp.n. from Corsica (Plathelminthes, Lecithoepitheliata) with special emphasis on its genito-intestinal connections

Palavras-chave: Skin; Ultrastructure; Polycystis naegelii.

Ano: 1978

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6984

Gnosonesima mediterranea sp. n. from algae in the Bay of Calvi (Corsica) is described. It is the first record of a Gnosonesima-species from the Mediterranean. The pharynx and the genital organs are extensively described at the light microscopic level from 1 µm Epon sections. The male "accessory organ" is revealed to be an andro-genito-intestinal connection with a high similarity with the female genito-intestinal connection. The taxonomic position of the Lecithoepitheliata is discussed.

On the male copulatory organ of some Polycystididae and its importance for the systematics of the family

Palavras-chave: Anatomy Distribution records New records New species Gnosonesima mediterranea MED; France; Corsica; Calvi Bay.

Ano: 1985

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6778

Schockaert, E.R..

Phylogeny of the digonoporid Proseriata

Palavras-chave: Polycystididae.

Ano: 1974

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6714

From a comparative study of the ultrastructure of the hard parts in the copulatory organ of the Proseriata, E. Martens (1984) concluded for the monocelidid genera she studied that in all except the genus Archimonocelis, the spines and styles are basal lamina differentiations: the autapomorphy for the monophylum Monocelididae.Archimonocelis has intracellular hard parts as in all other Proseriata, clearly the plesiomorphic condition. At the same time it was also found from a karyological viewpoint that there are arguments that Archimonocelis does not belong to the Monocelididae at all.

Revision of the Archimonocelididae (Platyhelminthes) Meixner, 1938

Palavras-chave: Animal morphology; Comparative studies; Taxonomy; Proseriata.

Ano: 1988

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3147

Martens, P.M.; Schockaert, E.R.; Curini-Galletti, M.C..

Sand dwelling Turbellaria from the Netherlands Delta area

Ano: 1991

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7368

Sand dwelling Turbellaria from the Delta of the Rivers Rhine, Meuse and Scheldt have been investigated. Thirty-eight samples taken from littoral and sublittoral stations in the Grevelingen, Eastern and Western Scheldt have been analysed. Thirty-three species were recorded (Acoela were not considered); twenty-four of them are new for the area and seven new species are described. Density and diversity of Turbellaria were higher in the Eastern Scheldt than in the Western Scheldt or in the Lake Grevelingen. A maximum density of 82 ind./100 cm³ was noted. A tentative calculation on relative abundance of the representatives of the different Turbellaria orders is established. Proseriata seem to be dominant in the localities studied.

Spermiogenesis and spermultrastructure in Thylacorhynchus ambronensis (Schizorhynchia, Kalyptorhynchia, Platyhelminthes)

Palavras-chave: Meiobenthos Taxonomy Turbellaria [Flatworms] ANE; Netherlands; Delta Area.

Ano: 1981

URL: http://www.vliz.be/imisdocs/publications/260405.pdf

Watson, N.A.; Schockaert, E.R..

Comprehensive ultrastructural investigation of spermiogenesis and the mature sperm in Thylacorhynchus ambronensis revealed a number of features valuable for cladistic analysis. Two basal bodies lie on either side of an intercentriolar body in the zone of differentiation of the spermatid, but only one develops into a normal flagellum while the other remains as a small bud, eventually disappearing. Structures within and surrounding the two basal bodies differ, and, contrary to observations in another monoaxonemal schizorhynch (Baltoplana magna), the two basal bodies become separated and only that of the normal flagellum is carried distally from the cytophore which unites an isogenic group of spermatids. A spiralling...

Studies on the ultrastructure of the genital organs in Proseriata (Turbellaria): I. Cirrifera aculeata (Ax) (Coelogynoporidae)

Palavras-chave: Phylogeny Kalyptorhynchia Plathelminthes Schizorhynchia Thylacorhynchus ambronensis Schilke; 1970 Turbellaria [Flatworms].

Ano: 1996

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6811

Martens, E.E.; Schockaert, E.R..

The genital organs in adult specimens of Cirrifera aculeata have been studied by transmission electron microscopy. The male copulatory organ is of the conjuncta-duplex type provided with a spiny cirrus. The structure of the epithelia lining the different parts of the genital organs is described. The cirrus spines and the spines in the genital atrium are shown to be intracellular specializations. The structure and location of the cirrus spines in the Proseriata studied so far are discussed.

Systematics and evolution in Polycystididae (Turbellaria, Kalyptorhyncia)

Palavras-chave: Animal reproductive organs Cirrifera aculeata (Ax; 1951) Proseriata.

Ano: 1985

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3281

Schockaert, E.R..

Possible evolutionary trends within Polycystididae have been indicated by Karling (1956) while studying the male genital organs of seyeral turbellarian groups. For the moment his ideas seem the most valuable basis for establishing an intrafamiliar system of Polycystididae, and have hence been applied formally (Schockaert, 1974). However, it can be demonstrated with several examples that the underlying principles prove to be unsatisfactory when one tries to apply Hennig's methodology:-the subfamily Duplacrorhynchinae Schockaert & Karling, 1970, can be recognized as containing the most plesimorph polycystidids; a synapomorph character that would give us an indication of the monophyly of this taxon is lacking;-the homology of some glandular elements (al!...

The anatomy and ultrastructure of the proboscis in Zonorhynchus-species and implications for phylogenetic relationships within the Eukalyptorhynchia Meixner, 1928 (Platyhelminthes, Rhabdocoela)

Palavras-chave: Evolution; Taxonomy; Polycystididae; Turbellaria [Flatworms].

Ano: 1977

URL: http://www.vliz.be/imisdocs/publications/238823.pdf

De Vocht, A.J.-P.; Schockaert, E.R..

The ultrastructural morphology of the proboscis in species of the genus Zonorhynchus Karling, 1952 is investigated. The proboscis epithelia are organized in four belts. The apical cone epithelium has intra-epithelial nuclei, and the distal belt of the sheath epithelium is formed by numerous cells lacking a distinct pattern. Multiciliary receptors are lacking. The diversity in ultrastructural data on the proboscis is used to elucidate the phylogenetic relationships within the Cicerinidae and Eukalyptorhynchia. A bipartite cone epithelium as found in Zonorhynchus-species is a common feature for all eukalyptorhynch species investigated. A syncytial basal cone epithelium is a synapomorphic character for all species except...

The importance of turbellarians in the marine meiobenthos: a review

Palavras-chave: Phylogeny; Proboscis; Ultrastructure; Eukalyptorhynchia; Platyhelminthes; Rhabdocoela; Zonorhynchus.

Ano: 1999

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=1116

Recent data and opinions on meiofaunal ecology are briefly reviewed; and from scattered data, the place of turbellarians in the meiobenthic community is discussed. Turbellarian diversity is of the same magnitude higher in sandy habitats than in muddy bottoms. In sand, turbellarian diversity is of the same magnitude as that of other important meiofaunal taxa, while densities range between 7-25% of the total meiofauna. Mean individual turbellarian dry weight seems to be four times that of nematodes and in sandy habitats turbellarian biomass may be equal to or exceed that of nematodes. Most turbellarian species may be considered as predators and in this respect may take the place occupied by macrofaunal species in muddy sediments.