Postembryonic development of Tanystylum bealensis (Pycnogonida, Ammotheidae) from Barkley Sound, British Columbia, Canada

All developmental stages of Tanystylum bealensis are described. This is the first complete developmental series of a pycnogonid species collected from a natural, rather than a laboratory‐reared population. Development proceeds through a series of nine instars from egg to adult, with major defining c...

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Veröffentlicht in:Journal of morphology (1931) 2006-03, Vol.267 (3), p.308-317
Hauptverfasser: Gillespie, J.M., Bain, B.A.
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description All developmental stages of Tanystylum bealensis are described. This is the first complete developmental series of a pycnogonid species collected from a natural, rather than a laboratory‐reared population. Development proceeds through a series of nine instars from egg to adult, with major defining characteristics of the instars being the addition of walking legs, loss of chelifores, and modification of larval appendages into adult palps and ovigers. All stages are free‐living on the hydroid Plumularia setacea, except for the first instar (protonymphon), which remains on the ovigers of the adult male for a short time after hatching. Development in T. bealensis is compared to development in both the closely related species T. orbiculare and to the more distantly related Achelia alaskensis. J. Morphol. © 2005 Wiley‐Liss, Inc.
doi_str_mv 10.1002/jmor.10402
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source Wiley-Blackwell Journals; MEDLINE
subjects Animals
Arthropods - anatomy & histology
Arthropods - growth & development
British Columbia
larva
Larva - growth & development
Life Cycle Stages
Male
sea spider
Time Factors
typical protonymphon
title Postembryonic development of Tanystylum bealensis (Pycnogonida, Ammotheidae) from Barkley Sound, British Columbia, Canada
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