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| Registros recuperados: 53 | |
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| Nijssen, H.. |
| During recent expeditions to Surinam, large ichthyological collections have been made from nearly all river systems by several ichthyologists, one of which was the author. Because of new information provided by the especially rich collections of Corydoras, a revision of the Surinam species and subspecies of this genus was thought necessary. This revision is based on 5211 specimens belonging to seventeen species and subspecies of which seven are new to science, viz., C. bondi coppenamensis, C. guianensis, C. heteromorphus, C. octocirrus, C. oelemariensis, C. schwartzi surinamensis and C. saramaccensis. A key to the Surinam species is provided and the taxonomic value of several characters is discussed. The distribution of the different groups within the... |
| Tipo: Article / Letter to the editor |
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| Ano: 1970 |
URL: http://www.repository.naturalis.nl/record/504990 |
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| Nijssen, H.. |
| This paper contains descriptions and figures of two new species of Corydoras Lacépède, 1803, C. weitzmani from Peru, and C. blochi from Guyana, Brazil, and Venezuela. The latter species is represented by two subspecies, C. blochi blochi from the Amazonas, Branco, Orinoco, and Essequibo drainages, and C. blochi vittatus from the Itapecuru basin. |
| Tipo: Article / Letter to the editor |
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| Ano: 1971 |
URL: http://www.repository.naturalis.nl/record/504743 |
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| Nijssen, H.; Stock, J.H.. |
| An alien amphipod, Gammarus tigrinus Sexton, has been observed in the Netherlands, mainly in oligohaline waters. It has had an “explosive” development in the Yssellake (the former Zuydersea) and occurs also in a great number of inland waterways in the province of North-Holland (fig. 1). It co-exists with, and often outnumbers, the local gammarids, G. pulex, G. zaddachi and G. duebeni. It is expected that the extension of its range will continue next years; fig. 2 illustrates the range of this introduced species in autumn 1965. Since Irish specimens of G. tigrinus were released in 1960 in the Yssellake, it is not clear whether the Dutch populations originate from the Irish stock, or whether that they were accidentally, e.g. in ballast tanks, carried to the... |
| Tipo: Article / Letter to the editor |
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| Ano: 1966 |
URL: http://www.repository.naturalis.nl/record/505062 |
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| Isbrücker, I.J.H.; Nijssen, H.. |
| Descriptions and illustrations are given of four species of mailed catfishes belonging to the subfamily Loricariinae, tribe Harttiini. Two species are assigned to Lamontichthys P. de Miranda Ribeiro, 1939: Lamontichthys filamentosus (La Monte, 1935) (type-species, of which Harttia filamentissima C. H. Eigenmann & Allen, 1942, is provisionally considered a junior synonym), based on a total of thirteen specimens, including all type-specimens, from Brazil, Bolivia, Peru, and Ecuador (all from tributaries of the Rio Amazonas system), and Lamontichthys stibaros n. sp., based on two specimens from Ecuador, sympatric with the former species. Harttia microps C. H. Eigenmann & Allen, 1942, is redescribed from three out of the five type-specimens,... |
| Tipo: Article / Letter to the editor |
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| Ano: 1978 |
URL: http://www.repository.naturalis.nl/record/504145 |
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| Nijssen, H.. |
| Gammarus fossarum Koch, 1835 est une espèce commune dans la partie sud du Limbourg (Pays-Bas), où elle est présente dans l’eau douce, non polluee, d’un pH de 6,2 à 7,0. Les études en campagne, effectuées en 1962 démontrent la présence de l’espèce à six localités en dehors du Limbourg, c’est-à-dire près d’Arnhem et de Nimègue, où elle vit dans les mêmes conditions qu’au Limbourg. D’ailleurs, il y a un échantillon de Gammarus fossarum au Musée zoologique d’Amsterdam, ramassé en 1949 dans un ruisseau dans la commune de Gendringen (la Gueldre), mais des recherches plus récentes ne découvrirent pas sa présence en cet endroit, fait probablement attribuable à la pollution actuelle de ses eaux. Dans 60% des localités connues dans les Pays-Bas Gammarus fossarum... |
| Tipo: Article / Letter to the editor |
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| Ano: 1963 |
URL: http://www.repository.naturalis.nl/record/505065 |
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| Bree, P.J.H. van; Nijssen, H.. |
| Recently the Zoological Museum in Amsterdam came into possession of three specimens of the White-beaked Dolphin, Lagenorhynchus albirostris. As data on this species are rather scarce, it may be useful to publish a few notes on these animals. The first dolphin, a female, was caught in the North Sea at 7.3 miles N.N.W. from IJmuiden (about 52° 34’ N, 4° 30’ E) at the end of November 1958 by a commercial fish-trawler. The animal was obtained by the Netherlands Whale Research Group T.N.O. (Prof. dr. E. J. Slijper and Drs. W. L. van Utrecht), Amsterdam, for anatomical studies. Afterwards the skull and the complete skeleton were presented to the Zoological Museum. The dolphin was pregnant, its fetus weighed 1.5 kg. This specimen bears the registration number ZMA... |
| Tipo: Article / Letter to the editor |
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| Ano: 1964 |
URL: http://www.repository.naturalis.nl/record/505163 |
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| Martin Salazar, F.J.; Isbrücker, I.J.H.; Nijssen, H.. |
| Dentectus barbarmatus, a new genus and species of mailed catfish of the subfamily Loricariinae, tribe Loricariini, is described from tributaries of the northern margin of the Orinoco River in Venezuela. Morphometric and meristic data of several specimens are presented and illustrations are given. The relationships of the new genus with other genera of the tribe are discussed. It is assigned to the subtribe Planiloricariina, together with Pseudohemiodon Bleeker, 1862, Rhadinoloricaria Isbrücker & Nijssen, 1974, Crossoloricaria Isbrücker, 1979, and Planiloricaria Isbrücker, 1971. |
| Tipo: Article / Letter to the editor |
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| Ano: 1982 |
URL: http://www.repository.naturalis.nl/record/504740 |
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| Isbrücker, I.J.H.; Nijssen, H.. |
| Hemiodontichthys acipenserinus (Kner, 1854) is redescribed and figured after examination of 132 specimens from the Rio Amazonas, Essequibo River, and Rio Paraguai systems, including five syntypes, from which the lectotype is selected. Reganella depressa (Kner, 1854) is redescribed and figured after examination of 7 specimens from the Rio Amazonas system, including two syntypes, from which the lectotype is selected. Relationships of the monotypic genera Hemiodontichthys Bleeker, 1862, and Reganella Eigenmann, 1905 with other genera are briefly discussed. |
| Tipo: Article / Letter to the editor |
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| Ano: 1974 |
URL: http://www.repository.naturalis.nl/record/505200 |
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| Registros recuperados: 53 | |
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