Oedipodrilus
Family Cambarincolidae (ref. ID; 6451, 6651)
- Oedipodrilus cuetzalanae Holt, 1984 (ref. ID; 6651)
- Oedipodrilus oedipus (ref. ID; 6451, 6466)
Descriptions
The acrosome is short. The acrosome tube is highly twisted with 1.5 gyres, is unusually variable in wall thickness, and has an external helical ridge on the crest of the gyres. A limen is absent. The acrosome vesicle protrudes in a digitiform manner beyond the anterior end of the tube and the plasma membrane is not covered with an apical corona. Inside the protruded vesicle is an apical ring of electron-dense material. The vesicle passes posteriorly and ends beyond the tube in an asymmetrical thickening. The end is invaginated basally to form a large subacrosomal space occupied by electron-dense material that extends anteriorly almost parallel with the limit of the tube. The nucleus is highly twisted, with the same pitch as the acrosome. The anterior nuclear surface has a deep concavity largely filled by the asymmetrical end of the vesicle, with the posterior surface having only a slight depression. The midpiece is longish and only slightly penetrated by the central microtubules of the axoneme. The flagellum has an axoneme with a prominent central sheath and a cylinder of electron-dense material surrounds the periphery of the basal region. The large helical marginal fiber begins below the dense cylinder and coils around the rest of the flagellum. (ref. ID; 6466)