title: Ultrastructure of the oocyst wall formation in Eimeria? beauchampi Leger and Duboscq, 1917, a coccidian parasite of Glossobalanus minutus (Kow.) (Enteropneusta, Hemichordata).
abstract: The ultrastructure of the developing oocyst of Eimeria? beauchampi Leger and Duboscq, 1917 was studied from the ventral digestive epithelium of the hepatic region of Glossobalanus minutus (Enteropneusta). A possible building mechanism of the oocyst wall is deduced and discussed from the present data and the available literature. During oocyst wall formation a total of 5 membranes were observed at or near the surface of the parasite among which some wall-forming materials will be stored. The origin and fate of such wall-forming materials are discussed and compared with data from other coccidians. The apparently full-formed wall is made up of an outer, dense layer, a median layer showing a labyrinthic-tubular lattice substructure, and an inner, homogeneous and osmiophilic layer. A micropyle measuring 0.35 micron in diameter is also described.
authors.affiliation: Departamento de Biología Animal I, Facultad de Biología, Universidad Complutense, Madrid España.
authors.forename: I
authors.initials: I
authors.lastname: Fernandez
authors.forename: J
authors.initials: J
authors.lastname: Benito
authors.forename: F
authors.initials: F
authors.lastname: Pardos
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000648:ultrastructure; D004539:Eimeria / Q000254:growth & development / Q000648:ultrastructure*; D008854:Microscopy, Electron; D013997:Time Factors