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The reproductive biology of deep-sea forcipulate seastars (Asteroidea: Echinodermata) from the N.E. Atlantic Ocean

Published online by Cambridge University Press:  11 May 2009

P. A. Tyler ,
S. L. Pain ,
J. D. Gage  and
D. S. M. Billett
P. A. Tyler
Affiliation:
Department of Oceanography, University College of Swansea, Singleton Park, Swansea, SA 8PP
S. L. Pain
Affiliation:
Department of Oceanography, University College of Swansea, Singleton Park, Swansea, SA 8PP
J. D. Gage
Affiliation:
Dunstaffnage Marine Research Laboratory, Scottish Marine Biological Association, P.O. Box 3, Oban, Argyll, PA3 AD
D. S. M. Billett
Affiliation:
Institute of Oceanographic Sciences, Wormley, Godalming, Surrey, GU8 5UB
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Extract

Samples of the deep-sea forcipulate seastars Brisinga endecacnemos, Brisingella coronata, Freyella spinosa and Zoroaster fulgens have been collected at a number of stations in the N.E. Atlantic. Examination of their reproductive biology suggests subtle interspecific variations in their gametogenic cycles. The gonads of Brisinga endecacnemos are serially arranged under the dorsal arm surface, each cluster of gonad tubules having its own gonopore. In the closely related Brisingella coronata each gonad consists of up to 12 elongate tubules opening at a single gonopore at the dorsal surface. In both species the maximum egg diameter is about 1250 μm and fecundity may be up to 60000 eggs per individual. It appears that the eggs in Brisinga endecacnemos are produced in clusters whilst those of Brisingella coronata are produced continuously. InFreyella spinosa the gonad consists of a small tubular sac analogous to a single tubule of Brisinga endecacnemos. Maximum fecundity is only 2500 eggs per individual, and the maximum egg size is 1250 μm. In all three species eggs that are not spawned undergo internal oocyte degeneration. The gonads of Zoroaster fulgens show the typical asteroid configuration of two at the base of each arm, one either side of the ambulacrum. The maximum oocyte diameter is 950 μm. There is some evidence that there may be a seasonality of reproduction in this species. In all four species examined the large egg size and relatively low fecundity suggest direct demersal development with the subtle variations in their reproductive biology reflecting slightly different breeding habits.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 64 , Issue 3 , August 1984 , pp. 587 - 601
Copyright
Copyright © Marine Biological Association of the United Kingdom 1984

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