Title Postembryonic development of Mymphon unguiculatum Hodgson 1915 (Pycnogonida, Nymphonidae) from the South Shetland Islands (Antarctica)
Author Sánchez, E.C.; López-González, P.J.
Author Affil Sánchez, E.C., Universidad de Sevilla, Departamento de Fisiología y Zoología, Biodiversidad y Ecología de Invertebrados Marinos, Sevilla, Spain
Source Polar Biology, 33(9), p.1205-1214. Publisher: Springer-Verlag, Berlin, Germany. ISSN: 0722-4060
Publication Date Sept. 2010
Notes In English. 32 refs. GeoRef Acc. No: 309107
Index Terms Antarctica--South Shetland Islands; Antarctica; Arthropoda; ecology; growth; Invertebrata; physiology; Scotia Sea Islands; South Shetland Islands
Abstract Male specimens of the sea spider species Nymphon unguiculatum, carrying eggs, larvae and postlarvae in various stages of development, were collected off the South Shetland Island at water depths between 112 and 472 m in austral summer 2006/2007. Here, we describe the external morphology of four postembryonic stages (protonymphon, instar 1, instar 2, and instar 3) carried by these specimens. We found that (1) protonymphon larvae hatch from the eggs; (2) larvae and postlarval stages have yolk reserves and are characterized by a relatively large size (average body lengths of 0.46, 0.55, 0.65 and 0.73 mm in the successive stages); (3) postlarvae remain on the ovigerous legs of males during several moults; (4) a spinning apparatus is present; (5) the development of walking legs is sequential. The larval and postlarval development of N. unguiculatum is compared with that known from other pycnogonid species.
URL http://hdl.handle.net/10.1007/s00300-010-0810-3
Publication Type journal article
Record ID 91203