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The Biological Bulletin, Vol 190, Issue 1 16-23, Copyright © 1996 by Marine Biological Laboratory

DEVELOPMENT AND REPRODUCTION

Intersex Red Claw Crayfish, Cherax quadricarinatus (von Martens): Functional Males with Pre-vitellogenic Ovaries

A. Sagi, I. Khalaila, A. Barki, G. Hulata and I. Karplus
Department of Life Sciences, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel

Intersex individuals, possessing both male and female genital openings, were assessed in two groups-7 and 19 months old-of Australian red claw crayfish (Cherax quadricarinatus). All intersex individuals investigated were functional males, as suggested by their malelike morphology and the presence of testes, sperm ducts, androgenic glands, and viable spermatozoa. When an ovary was present in an intersex individual from either group, the gonadosomatic index, the diameter of the oocytes, and the ovarian cytosolic polypeptide profile were similar to those of immature, pre-vitellogenic females. We conclude that intersexuality in C. quadricarinatus does not indicate a case of protandric sequential hermaphroditism, as previously suggested. The case of intersexuality described here presents a unique model for the study of the role of the androgenic gland in the regulation of sex differentiation in crustaceans.


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