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| Registros recuperados: 44 | |
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| Hammen, L. van der. |
| Progress in classification of Chelicerata has been thwarted especially by two factors, viz., the concept of mites as one monophyletic group, and the opinion that this group consists of species with a highly modified plan of construction and without any trace of true segmentation. The only characters which are generally shared by all groups of mites refer to the presence of a gnathosoma (i.e. the cone-shaped, movable structure comprizing the mouthparts), and the occurrence of a larva with only three pairs of legs (the last-mentioned character is also found in Ricinulei). A comparative morphological study of the gnathosoma (Van der Hammen, 1970b, 1972) has, however, demonstrated that two fundamentally different types can be distinguished, which must be the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1977 |
URL: http://www.repository.naturalis.nl/record/319210 |
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| Hammen, L. van der. |
| INTRODUCTION The genus Metabelba was created by Grandjean in 1936 for Belbidae of which the solenidions of tibiae II and III are coupled with protective hairs, but of which the solenidion of tibia IV is free, long, and tactile. The genus belongs to the group of rather small species that are never covered with foreign material, but of which the cerotegument is very thick, especially on the moniliform legs, whilst the adults often bear the larval and nymphal skins. The species have three or four lateral apophyses : one (which is not always present) between leg I and leg II, two between II and III, and one between III and IV. We have been in doubt as to the nomenclature of these apophyses, for although they have generally been regarded as tectopedia, they do... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1953 |
URL: http://www.repository.naturalis.nl/record/318814 |
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| Hammen, L. van der. |
| INTRODUCTION In 1961 I published a paper on a species of the genus Holothyrus, in which I paid also some attention to the general classification of the mites. Before that time I had chiefly studied Oribatid mites, and I was surprised by the neglect of important discoveries made in the field of Oribatid morphology by specialists of other groups. I realized that a comparative study of acarid morphology was badly needed, and that this could be the only base for a satisfactory general classification. I continued and developed this idea, and in the course of ten years I investigated, in a more or less detailed way, representatives of all groups of mites. In this way I published papers on Opilioacarida (Van der Hammen, 1966, 1968a, 1968b, 1969b, 1971),... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/318895 |
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| Hammen, L. van der. |
| In de jaren 1942-1949 werd door een aantal Nederlandse biologen een onderzoek ingesteld naar de samenstelling van de kassenfauna van ons land, zulks ter vergelijking met resultaten op dit gebied verkregen in andere landen. Het onderzoek resulteerde in een aantal artikelen over verschillende diergroepen, gepubliceerd in diverse tijdschriften. Hoewel deze artikelen als serie bedoeld waren, werden zij (met uitzondering van Meeuse, 1943, en Van Ooststroom, 1944) nooit als zodanig genummerd, zodat het moeilijk is een overzicht te krijgen van wat destijds gevonden werd. Om deze reden is onderstaande korte bibliografie samengesteld die zich beperkt tot de artikelen door de medewerkers in de onderzoekperiode geschreven. De artikelen zijn gerangschikt naar... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1969 |
URL: http://www.repository.naturalis.nl/record/317228 |
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| Hammen, L. van der. |
| CONTENTS I. Introduction.................. 1 II. Bibliography.................. 4 III. Systematic review................ 8 IV. References..................84 V. Index...................90 I. INTRODUCTION Among the works of acarologists of the past, Berlese's numerous writings take a particular place. Although they contain descriptions of an enormous number of new species, and notwithstanding the fact that they must be regarded as an important contribution to progress of systematics, the way of publishing is superficial to such a degree that Berlese appears to be the author that created the largest number of problems. As a rule his Latin descriptions are extremely short and consist of a few lines only. When exceptionally a figure is given, it represents at... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1959 |
URL: http://www.repository.naturalis.nl/record/317580 |
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| Hammen, L. van der. |
| Het Vogeljaar door Jac. P. Thijsse, waarvan in 1969 de zesde druk verscheen, is door zijn in opeenvolgende drukken herhaaldelijk wisselend uiterlijk, een interessant historisch object geworden. De tekst evolueerde langzaam, doordat bij iedere nieuwe druk nieuwe gegevens werden toegevoegd en kleine correcties werden aangebracht. Op het gebied van illustraties, formaat, typografie en bandversiering hadden echter bijna steeds (behalve bij de derde druk die veel lijkt op de tweede) ingrijpende veranderingen plaats. In grote lijnen kan men zeggen dat de eerste drie drukken nauw verbonden zijn met de kring van medewerkers aan het tijdschrift De Levende Natuur, de volgende drie drukken met die van medewerkers aan De Wandelaar. Door vergelijking van de drukken kan... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.01. |
| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/317235 |
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| Hammen, L. van der. |
| Over de bastaardschorpioenen van Nederland zijn slechts enkele verspreide gegevens gepubliceerd ; deze gegevens moeten bovendien bijna alle nog eens op juistheid van determinatie worden gecontroleerd. Ik meen dat een naamlijst die als basis kan dienen voor verder faunistisch onderzoek (afgezien van Rit sema, 1874) tot nu toe voor ons land niet bestond. Het is daarom zeer verheugend dat Prof. Dr. M. Beier (Naturhistorisches Museum, Zoologische Abteilung, Wenen), naast zijn bewerking van ons buitenlandse materiaal, ook nog tijd heeft gevonden voor determinatie van de Nederlandse bastaardschorpioenen uit de verzameling van het Rijksmuseum van Natuurlijke Historie. Het bleek hem dat deze collectie een aantal interessante aanvullende gegevens verschafte over de... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1969 |
URL: http://www.repository.naturalis.nl/record/317224 |
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| Hammen, L. van der. |
| A comparative study is made of two groups of Chelicerata (Palpigradi and Actinotrichid mites, together constituting the Epimerata, a chelicerate class), and models of the evolution of epimerate characters are prepared. The study is based on the same methods and principles as the first part of the present series, and the same terminology has been used. The models of the evolution of characters constitute the epimerate archetype and the standard of epimerate classification. |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1982 |
URL: http://www.repository.naturalis.nl/record/317809 |
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| Hammen, L. van der. |
| A comparative study is made of the three groups (Cyphophthalmi, Laniatores and Palpatores) into which Opilionida are currently subdivided. Methods, principles and terminology, adopted in this paper, correspond with those of parts I and II of the present series of studies in Chelicerata. Special attention is paid to mouthparts and appendages, to opilionid relationships, and to the evolution of chelicerate characters. It is demonstrated that Cyphophthalmi present all the essential opilionid characters, and evidently do not constitute a separate group. It is also demonstrated that Opilionida are not closely related to Actinotrichid or Anactinotrichid mites, but to other groups with a so-called myliosoma (mouthparts associated with coxisternal feeding); these... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Opilionida; Chelicerata; Comparative morphology; Classification; Evolution; Phy- logeny.; 42.74. |
| Ano: 1985 |
URL: http://www.repository.naturalis.nl/record/317785 |
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| Hammen, L. van der. |
| A comparative study is made of four chelicerate classes: Apatellata (Solifugae and Pseudoscorpionida), Arachnida s. str. (both groups of Uropygi, i.e. Holopeltida and Schizomida, Amblypygi and Araneida), Scorpionida and Xiphosura. Methods, principles and terminology, adopted in this paper, correspond with those of parts I -111 of the present series of comparative studies in Chelicerata. Special attention is paid to segmentation of the body, respiratory organs, orifices of coxal glands, mouthparts, and appendages. The evolution of these structures is studied, and the relationships of the chelicerate classes and subclasses are reinvestigated and discussed. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Amblypygi; Apatellata; Arachnida; Araneida; Chelicerata; Evolution; Holopeltida; Morphology; Pseudoscorpionida; Schizomida; Scorpionida; Solifugae; Uropygi; Xiphosura.; 42.74. |
| Ano: 1986 |
URL: http://www.repository.naturalis.nl/record/317847 |
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| Hammen, L. van der. |
| A broad survey is given of the occurrence and distribution of microarthropods (and some other animals) in the soil of the following vegetation types in New Guinea: algal communities in the intertidal zone, beach forest, mangrove swamp forest, sago palm swamp, lowland swamp forest, forests on limestone and other sedimentary rocks, pioneer vegetation on barren coral limestone, forests on serpentine and cristalline schists, and montane vegetations. |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.65. |
| Ano: 1983 |
URL: http://www.repository.naturalis.nl/record/317748 |
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| Hammen, L. van der. |
| A study is made of the Arachnid fauna of the subterranean limestone quarries in Southern Limburg, The Netherlands. About a hundred quarries have been investigated, and ten species of Opilionida, three species of Pseudoscorpionida and fifty-six species of Araneida are listed here. Among the species most frequently met with are: Nesticus cellulanus (Clerck), Meta merianae (Scopoli), Lepthyphantes pallidus (O. P.-Cambridge), Tegenaria silvestris L. Koch, Meta menardi (Latreille), Lepthyphantes leprosus (Ohlert), Amaurobius ferox (Walckenaer) and Paranemastoma quadripunctatum (Perty) (species arranged according to decreasing frequency). |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1983 |
URL: http://www.repository.naturalis.nl/record/317194 |
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| Hammen, L. van der. |
| On December 7, 1953, while collecting animals along the south coast of Biak Island (Netherlands New Guinea), in the neighbourhood of the Base of the Royal Netherlands Navy 1), I was surprised in seeing red Trombidiid mites creeping on stones in the intertidal zone. These stones, which fall dry at low tide, were overgrown with green Cladophora socialis and several species of red algae 2). I became interested in the fauna of the littoral, especially in the possible presence of other Acari, and I spent several mornings in observing the animal life on the stones. The Trombidiid mites later appeared to belong to a Platytrombidium species, closely related to the species described by Michener (1946) as Microtrombidium littorale from mangrove forests along the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1960 |
URL: http://www.repository.naturalis.nl/record/319120 |
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| Hammen, L. van der. |
| The present paper is the first part of a series of two studies dealing with the morphology of the suborder Holothyrina. Some years ago (Van der Hammen, 1961), I published already an extensive description of a species from New Guinea (Holothyrus grandjeani Van der Hammen), in which paper I pointed to a number of important characters generally neglected in the study of Anactinotrichida. Because my material of H. grandjeani contained only one adult specimen, a number of characters (e.g. details to be studied in transverse as well as in longitudinal sections) could, however, not be taken into consideration. As a result of my 1961 study, a reinvestigation of nearly all species of Holothyrus, and especially of the type-species (H. coccinella), became highly... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1965 |
URL: http://www.repository.naturalis.nl/record/318632 |
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| Hammen, L. van der. |
| A study is made of John Ruskin's work in the field of zoology. It is demonstrated that Ruskin's early interest in zoology was connected with his study of ornament, whilst his later studies are connected with his Oxford teaching and his social work. Ruskin's interest in zoology concerned groups frequently represented in art (particularly birds and snakes). Of these groups he studied, in a fragmentary way, the artistic morphology, the life-habits, the particular position to art and literature, and the mythological signification. Besides that, his natural history teaching was focussed on the protection of animals and respect for nature. |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.01. |
| Ano: 1983 |
URL: http://www.repository.naturalis.nl/record/318416 |
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| Hammen, L. van der. |
| A study is made of the morphology and postembryonic development of Rhizoglyphus echinopus (Fumouze & Robin), a species of Acaridida (Actinotrichid mites). The study is based on the same methods and principles as the author's previous studies of mites and other groups of Chelicerates. Particular attention is paid to the homology of the setae of idiosoma and appendages, and to the postembryonic development of the paraproctal setae. A new interpretation is given of bursa copulatrix and fertilization. |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1982 |
URL: http://www.repository.naturalis.nl/record/319011 |
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| Registros recuperados: 44 | |
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