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J. Moll. Stud. (1987), 53, 153-162
© The Malacological Society of London 1987

research-article

STUDIES ON THE MORPHOLOGY AND CROSSBREEDING ABILITY OF TWO POPULATIONS OF BULINUS GLOBOSUS FROM NORTHERN NIGERIA

S. E. FRYER1,*, D. ROLLINSON2 and A. J. PROBERT1

1School of Animal Biology, University College of North Wales Bangor, Gwynedd LL57 2UW; and 2Department of Zoology, British Museum (Natural History) Cromwell Road, London SW7 5BD

The general appearance and dimensions of the shells and copulatory organs of two populations of Bulinus globosus (Lake Chad and Ngala) from the area of the South Chad Irrigation Project, Nigeria, were compared using samples bred in laboratory cultures.

The body tissues of Lake Chad snails were darker than those of individuals from the Ngala sample, and lacked the distinct black patches seen on the mantle of the latter.

Significant differences in the occurrence of copulatory organ eversion on relaxation in menthol were observed between the samples. Both the total length and relative dimensions of preputium and penis sheath also differed significantly between the Lake Chad and Ngala populations.

Crossbreeding experiments using enzymes (GPI and HBDH) as genetic markers showed that cross-fertilisation between Lake Chad and Ngala snails is possible. The observed physical differencess probably resulting from the ecological separation of these two populations have not resulted in their reproductive isolation.

*Present address: Department of Zoology, Oregon State University, Coroallis, Oregon 97331, USA.

(Received 14 October 1986;
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