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image of Journal of Crustacean Biology

ABSTRACT Short interval monitoring of isolated females of Streptocephalus dichotomus Baird, S. proboscideus(Frauenfeld), and S. torvicornis (Waga) revealed no resorption of unfertilized oocytes in the lateral pouches of the oviducts or in the ovisac. Oocytes expelled by the female disintegrate in the medium. This finding is in disagreement with earlier studies on S. dichotomus and S. proboscideus, but corroborates findings on S. vitreus (Brauer) and S. rubricaudatus (Klunzinger). Light and electron microscopic studies of unfertilized and fertilized oocytes show polar-body extrusion, vitelline-membrane formation, and egg-shell deposition in fertilized oocytes only. The streptocephalids studied here differ, in this respect, from two other anostracans, Tanymastix and Artemia, where unfertilized oocytes develop a vitelline membrane, and sometimes an egg shell.


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