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The reproductive biology of Ypsilothuria talismani (Holothuroidea: Dendrochirota) from the N.E. Atlantic

Published online by Cambridge University Press:  06 October 2009

P. A. Tyler  and
J. D. Gage
P. A. Tyler
Affiliation:
Department of Oceanography, University College of Swansea, Singleton Park, Swansea, SA2 8PP
J. D. Gage
Affiliation:
Dunstaffnage Marine Research Laboratory, Oban, Argyll, Scotland, PA34 4AD
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Abstract

Samples of the deep-sea holothurian Ypsilothuria talismani were collected in a time series sampling programme from April 1978 to August 1981 at a 2200 m station in the northern Rockall Trough. The gonad of Ypsilothuria talismani lies beneath the dorsal body wall and the gonad tubules ramify throughout the body cavity close to the gut. In the female, there is no synchrony of gamete development between tubules although macroscopic observation suggests oocyte development is synchronous within each tubule. Maximum fecundity at any time is less than 50 oocytes per individual. The developing oocyte grows to a maximum size of 350 μm and is lined with accessory cells. Spermato-genesis is initiated at several nodes along the tubule with maximum sperm production at the periphery of each node. As spermatogenesis proceeds more of the tubule becomes active until, at maximum development, the tubule is a long digitate structure. We have found no evidence of seasonal reproduction throughout the time series samples. From the egg size, and fecundity we infer lecithotrophic development, with a reduced larval stage, for this species.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 63 , Issue 3 , August 1983 , pp. 609 - 616
Copyright
Copyright © Marine Biological Association of the United Kingdom 1983

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