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| Registros recuperados: 10 | |
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| Pierrot-Bults, A.C.. |
| In this paper an attempt is made to give a general survey of our present knowledge about the relations between distribution patterns and diversity chiefly based on chaetognaths. Six main Zoogeographic patterns are distinguished, viz. cosmopolitan, 40° N to 40° S circumglobal, 30° N to 30° S, biantitropical, circumpolar, and neritic; their relation with holoplankton diversity is discussed. Generally the more limited the distribution of a holoplanktonic species, the less infraspecific variation is observed. The most common pattern is the circumglobal from 40° N to 40° S. No obvious relations between distribution patterns and taxonomic categories could be traced. |
| Tipo: Article / Letter to the editor |
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| Ano: 1976 |
URL: http://www.repository.naturalis.nl/record/505581 |
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| Pierrot-Bults, A.C.. |
| The inadequacies of the original descriptions of Sagitta decipiens Fowler, 1905, and S. sibogae Fowler, 1906, have led to confusion concerning these species. Sagitta neodecipiens Tokioka, 1959, is a junior synonym of S. decipiens Fowler, 1905. S. sibogae Fowler, 1906, is the valid name for the species usually incorrectly named S. decipiens (non Fowler, 1905) because of the redescription of Ritter-Zahony (1911). S. philippini Michael, 1919, is a junior synonym of S. sibogae. The two valid species are redescribed from the types, and lectotypes have been designated. |
| Tipo: Article / Letter to the editor |
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| Ano: 1979 |
URL: http://www.repository.naturalis.nl/record/505520 |
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| Pierrot-Bults, A.C.. |
| The histology of the seminal vesicles of Sagitta serratodentata, S. pseudoserratodentata, S. pacifica, S. tasmanica, and S. bierii is described. To conclude from the structure of these vesicles S. serratodentata, S. pseudoserratodentata, and S. pacifica are closely related. For both S. tasmanica and S. bierii no relations with other species could be traced. S. bierii is considered the most primitive species of the group. |
| Tipo: Article / Letter to the editor |
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| Ano: 1976 |
URL: http://www.repository.naturalis.nl/record/505340 |
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| 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 |
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| 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 |
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| Pierrot-Bults, A.C.. |
| The morphology and histology of the reproductive organs of Sagitta planctonis forma planctonis and of S. planctonis forma zetesios are described. No difference in number of oocytes was observed. The existence of a temporary oviduct is questionable. It may be possible that the so-called accessory fertilization cells are not actually participating in fertilization, but they may have a resorptive or secretory function. |
| Tipo: Article / Letter to the editor |
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| Ano: 1975 |
URL: http://www.repository.naturalis.nl/record/504630 |
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| Registros recuperados: 10 | |
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