Encyclopedic Reference of Parasitology: Biology, Structure, by Heinz Mehlhorn Professor Dr. (eds.) PDF

By Heinz Mehlhorn Professor Dr. (eds.)

ISBN-10: 3540148256

ISBN-13: 9783540148258

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Males normally have two testes, but monorchidism is rather frequent. A seminal vesicle may be present (Eoacanthocephala). The vasa efferentia fuse to form a vas deferens, which fuses with one or several ducts of the cement gland(s) to form a genital canal. Cement glands are significant accessory organs (1±8 in number), and eoacanthocephalans have a separate cement reservoir (? Acanthocephalan Infections/Fig. 6 (Vol. 2)). The cement locks the female vagina after copulation until the first embryonated eggs are released, and forms typical copulatory caps on the posterior tips in inseminated females.

18 A-C. Micrographs of acanthocephalan floating ovaries and fertilization of the enclosed oocytes. A Light micrograph. Floating ovaries (FO) are contained within the two ligament sacs which are separated by the fibrous ligament strand (LS) (Paratenuisentis ambiguus, Eoacanthocephala). Note the oocytes (O) lying underneath the surface syncytium (SS) of the ovaries, adhering sperms (SP), the detached zygotes (DZ), and the shell-coated developing eggs (E). x 260. B Scanning electron micrograph. A floating ovary from the body cavity of Acanthocephalus anguiliae (Palaeacanthocephala) shows numerous sperms at its surface.

In archiacanthocephalans Acanthocephala 21 Fig. 14C-D. C, D Semithin sections of the praesoma (and partly the metasoma: A) of adult acanthocephalans. A Longitudinal section showing the cytoplasmic ``finger'' (CP) of the (inner) receptacle wall projecting into the proboscis. Also note the lacunar system (LS) inside the metasomal tegument (MT); SE: septum between praesomal and metasomal tegument. x 30. D Transverse section through the receptacle wall musculature (IW: inner wall, OW: outer wall) of Acanthocephalus lucii; note the tubular structure of the proboscis retractor musculature with its cytoplasmic cores (CP) of low density.

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Encyclopedic Reference of Parasitology: Biology, Structure, Function by Heinz Mehlhorn Professor Dr. (eds.)


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