Spermiogenesis in the pseudophyllid cestode Eubothrium crassum (Bloch, 1779).

Abstract:

:Spermiogenesis of the pseudophyllidean tapeworm Eubothrium crassum has been described by the aid of transmission electron microscopy for the first time. Initially, early spermatids form a distal cytoplasmic protrusion, a differentiation zone containing a small electron-dense, apically oriented region. Out of this region, two centrioles with rootlets develop. The centrioles become orientated in the same plane with the appearance of an intercentriolar body. Now, the long axes of the rootlets are parallel with each other and with the long axis of the nucleus. Two flagella of subsequently unequal length are formed very rapidly. Simultaneously, a median cytoplasmic process (MCP) develops distal to the flagella. Two arching membranes appear at the base of the differentiation zone. Each flagellum, still being in contact with an intercentriolar body, rotates to a position parallel with the MCP. The nucleus migrates very rapidly into the MCP at this stage. Subsequently, the two flagella fuse with the MCP. Finally, the basal bodies with the rootlets detach from the flagella, the intercentriolar body changes its structure and spermatids are pinched off from a condensing residual cytoplasm at the level of the arching membranes.

journal_name

Parasitol Res

journal_title

Parasitology research

authors

Brunanská M,Nebesárová J,Scholz T,Fagerholm HP

doi

10.1007/s004360100392

subject

Has Abstract

pub_date

2001-08-01 00:00:00

pages

579-88

issue

8

eissn

0932-0113

issn

1432-1955

journal_volume

87

pub_type

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