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Self- and cross-fertilization in Spirorbis borealis and S. pagenstecheri

Published online by Cambridge University Press:  11 May 2009

J. M. Gee  and
G. Brinley Williams
J. M. Gee
Affiliation:
Department of Zoology, University College of Swansea
G. Brinley Williams
Affiliation:
Marine Science Laboratories, Menai Bridge
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Extract

Evidence is presented that eggs and sperm of Spirorbis borealis are shed through the nephridioducts, and that fertilization occurs externally to the body but inside the tube.

The eggs fail to develop in vitro unless sperm is present. In individuals collected in winter and maintained at 15 or 19° C, the male and female gonads mature more or less simultaneously. Among groups of individuals sperm is usually shed first and soon afterwards a large proportion may be observed to have extruded ova.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 45 , Issue 1 , March 1965 , pp. 275 - 285
Copyright
Copyright © Marine Biological Association of the United Kingdom 1965

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