Larvae of three sea spider species of the genus Nymphon (Arthropoda: Pycnogonida) from the White Sea

Larvae of three Nymphon species are described. For Nymphon brevirostre Hodge, 1863 and Nymphon micronyx Sars, 1888 protonymphon larvae are examined, larvae of N. micronyx have been studied for the first time. The fine external morphology of larvae is studied in detail using SEM methods; the internal...

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Bibliographic Details
Published inRussian journal of marine biology Vol. 33; no. 3; pp. 145 - 160
Main Author Bogomolova, E. V.
Format Journal Article
LanguageEnglish
Published 01.06.2007
Subjects
Araneae
Arthropoda
Marine
Nymphon
Nymphon brevirostre
Nymphon grossipes
Nymphonidae
Pycnogonida
PNE, White Sea
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Summary:Larvae of three Nymphon species are described. For Nymphon brevirostre Hodge, 1863 and Nymphon micronyx Sars, 1888 protonymphon larvae are examined, larvae of N. micronyx have been studied for the first time. The fine external morphology of larvae is studied in detail using SEM methods; the internal structure of N. brevirostre protonymphon is additionally described. SEM data on external morphology and fine surface structures are given for several postembryonic stages of Nymphon grossipes Fabricius, 1780. Different types of postembryonic development are revealed in examined Nymphon species. N. brevirostre and N. micronyx have a 'typical protonymphon' developmental pathway. A special developmental pathway named 'lecithotrophic protonymphon' is suggested for N. grossipes and other Nymphonidae having large yolky eggs.
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ISSN:1063-0740
1608-3377
DOI:10.1134/S1063074007030029