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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 ,
Christa Weinzierl  and
Roland R. Melzer
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
*
Correspondence should be addressed to: T. Lehmann, Zoologische Staatssammlung München, Münchhausenstrasse 21, D-81247 München, Germany email: [email protected]
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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.

Keywords

sea spiderPycnogonidaPantopodaAcheliaprotonymphonlarvadevelopmentSEM
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 91 , Issue 5 , August 2011 , pp. 1081 - 1087
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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