Postembryonic development of Tanystylum bealensis (Pycnogonida, Ammotheidae) from Barkley Sound, British Columbia, Canada |
| |
Authors: | Gillespie J M Bain B A |
| |
Affiliation: | Systematics and Evolution Program, Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada. |
| |
Abstract: | 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. |
| |
Keywords: | typical protonymphon larva sea spider |
本文献已被 PubMed 等数据库收录! |
|