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| Registros recuperados: 32 | |
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| Land, J. van der. |
| INTRODUCTION Flatworms living as commensals on parasitic copepods from marine fishes were known already as- early as 1835, when Johnston described Udonella caligorum from Caligus spec., a parasite of Hippoglossus hippoglossus (L.). Since then a number of similar genera and species have been described, but none of these is clearly different from Udonella caligorum, as far as can be judged from the descriptions. Therefore only one valid species is recognized by most modern authors (Price, 1938; Sproston, 1946; Ivanov, 1952b). Calinella ophiodontis Kay, 1945, a species not listed by these authors, probably is another synonym to be added to the long list, but Kay's material should be re-examined before a final decision can be made. In Yamaguti's compilation... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.76. |
| Ano: 1967 |
URL: http://www.repository.naturalis.nl/record/318129 |
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| Land, J. van der. |
| Recently DELAMARE DEBOUTTEVILLE & RENAUD-MORNANT (1965) described two new species of marine tardigrades, Florarctus heimi and F. salvati, for which they erected a new genus. The representatives of this remarkable genus are characterized by the possession of large, aliform expansions of the body, structures which were unknown among the Tardigrada. The two species were taken from coral sand from New Caledonia. Two specimens of an undescribed species, which undoubtedly belongs to the genus Florarctus, have now been found in a sample of coral sand from Curaçao. The sample, preserved in alcohol, was kindly put at the author’s disposal by Dr. P. WAGENAAR HUMMELINCK, who collected it during his investigations of the Piscadera Baai in 1964. |
| Tipo: Article / Letter to the editor |
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| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/506036 |
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| Land, J. van der; Dienske, H.. |
| INTRODUCTION Species of the genus Gyrocotyle are quite common intestinal parasites of chimaerids. As far as we now know, each parasite species is restricted to one host species. In each host species, however, a second and much rarer species of Gyrocotyle may occur besides the common one. The common species are systematically related to each other, and so are the rare ones. In the present paper two species of the group of rare species are described. Their existence has been known already for a long time, but, for different reasons, they have never been recognized as separate species. DEFINITION OF SOME TERMS Ι. Spines. — We recognize two types of spines in the genus Gyrocotyle, viz., the urna-type and the confusa-type. In spines of the urna-type the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.36. |
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/319350 |
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| Land, J. van der. |
| INTRODUCTION The species of the genus Priapulus occur in rather cold water. Hence, their shallow-water distribution is restricted to northern and southern waters (fig. 1); there are only a few isolated records from sub-tropical localities. However, in deep water the genus apparently has a world-wide distribution (fig. 2). The northern species (P. caudatus De Lamarck) and the southern species (P. tuberculatospinosus Baird) from shallow water are well defined but the specimens from the deep sea present systematical problems. In my survey of the Priapulida (Van der Land, 1970) I could not answer the question of their identity, because I had seen only very few specimens from deep water and not a single one from the tropical deep sea. Meanwhile I could study... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.79. |
| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/318493 |
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| Land, J. van der. |
| INHOUD Inleiding................ 3 Technische zaken............. 4 Programma............... 5 Overzicht van de monsters........... 7 Het meiobenthos............. 19 Het plankton.............. 35 De macrofauna.............. 36 English summary............. 44 Literatuur betreffende Surinaamse Limnologie...... 44 INLEIDING In februari en maart 1967 werd een vijf weken durend bezoek aan Suriname gebracht met de bedoeling daar een studie te maken van de microscopische bodemfauna, het zogenaamde meiobenthos, van het zoete water. Tot dit meiobenthos behoren dieren van allerlei groepen die voordien niet of vrijwel niet verzameld waren in Suriname. Speciale aandacht werd geschonken aan enkele groepen van wormen, die ter plaatse levend bestudeerd moesten worden;... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.93. |
| Ano: 1970 |
URL: http://www.repository.naturalis.nl/record/317275 |
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| Land, J. van der. |
| INTRODUCTION Two years ago I found two specimens of a curious animal in a sample of coral sand from Curaçao. It superficially resembled the larva of priapulids, animals that are restricted to cold water. The condition of the specimens did not permit of a description and I did not succeed in determining the group to which the species could possibly belong. Later I happened to see a paper by Remane (1963) in which he gives a simple figure of "a not yet described animal from the sandy bottom of the Red Sea". I immediately recognized it as a relative of the species from Curaçao. Upon request Professor Remane informed me that he had fixed some specimens, but that these were lost. He had not found more material of the species and he had not heard of these... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.71. |
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/318436 |
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| Land, J. van der. |
| INTRODUCTION Freshwater microturbellaria of the Netherlands were studied already by De Man (1874). Since then this subject has not received much attention and much faunistic research remains to be done on this large and interesting group. The present paper deals with material from distribution mains for drinking water in the South and the West of the Netherlands and from a canal in the city of Leiden. A new species of Microdalyellia is described. MATERIAL AND METHODS The material was taken from the following samples: Sample no. 150. Leiden, Zoeterwoudse Singel (canal), near Koepoortsbrug. Between vegetation (Glyceria); decaying vegetable debris, mainly Glyceria and Aesculus leaves; 10-15 cm deep; temperature above 50 C (there was no ice in the second half... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.76. |
| Ano: 1965 |
URL: http://www.repository.naturalis.nl/record/318744 |
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| Registros recuperados: 32 | |
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