出版社：International Academy of Ecology and Environmental Sciences
摘要：The protonymphon larva and next four instars of the pycnogonids Nymphon charcoti are described. Thedevelopmental pattern is that of a “Typical Protonymphon” according to Bain’s 2003 classification. Thedescription is based on archived specimens from the National Museum of Natural History collections. Thewalking legs appear initially as underived buds with three pseudo-segments beginning with walking leg one inthe second instar. In the subsequent instars the walking legs appear as six segmented appendages and theneight segmented appendages. In the genus Nymphon there are four different post embryonic developmentalpatterns, “Typical Protonymphon”, “Attaching Larva”, “Lecithotrophic Larva” and “Elvie’s Larva”. Thisdiversity of developmental patterns within the same genus which is not restricted to the Nymphonidaeindicates that the developmental patterns as currently defined in the literature have little phylogeneticrelevance.
