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SEM description of the first larval instar of Achelia assimilis (Pycnogonida: Ammotheidae)

Published online by Cambridge University Press:  14 January 2011

Tobias Lehmann
Affiliation:
Zoologische Staatssammlung München, Münchhausenstrasse 21, D-81247 München, Germany
Christa Weinzierl
Affiliation:
Ludwigs-Maximilians-Universität, BioZentrum Martinsried, Großhaderner Strasse 2, D-82152 Planegg-Martinsried, Germany
Roland R. Melzer
Affiliation:
Zoologische Staatssammlung München, Münchhausenstrasse 21, D-81247 München, Germany
Corresponding
E-mail address:

Abstract

The present paper is the first scanning electron microscope (SEM) description of a protonymphon larva of an Ammotheidae. The morphology of the first larval instar of Achelia assimilis is described in detail and illustrated for the first time. The morphological characters are compared to previous larval descriptions of other pycnogonid species. The larvae are integrated into Bain's classification of larval types within the pycnogonids (Bain, 2003a) as a ‘typical protonymphon’. Larvae were obtained from ovigerous males, caught in Punta Huinay, Huinay, Chile and analysed with light microscope and SEM. Descriptions of pycnogonid protonymphons at a species-specific level in the future will contribute to a deeper understanding of larval pycnogonid taxonomy at the level of differential diagnoses.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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SEM description of the first larval instar of Achelia assimilis (Pycnogonida: Ammotheidae)
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