deferens . The gonoduct is also differentiated along its length, the first third being formed from synthetically active epithelial cells, the two layers of which form a tiled structure. There is no lumen in the gonoduct and it is probable that, due to the tiled structure, the epithelial cells move apart to

In: Nematology

Nematology , 2003, Vol. 5(2), 293-306 Comparative morpho-anatomical studies of the female gonoduct within the Pratylenchidae (Nematoda: Tylenchina) Wim B ERT ¤ , Ruben V AN G ANSBEKE , Myriam C LAEYS , Etienne G ERAERT and Gaëtan B ORGONIE Department of Biology, Ghent University

In: Nematology

. Keywords – Acrobeloides , Caenorhabditis , Cephalobus , Chiloplacus , cytoskeleton, gonoduct, paramyosin, Prionchulus , propulsion, Zeldia . The reproductive system of the phylum Nematoda has proved to be exemplary for the study of fundamental problems in cell biology and developmental biology (Hubbard

In: Nematology

Steinernema ( S. affine , S. arenarium , S. bicornutum , S. carpocapsae , S. feltiae and S. glaseri ) were studied using light microscopy. Investigation of the gonoduct morphology was completed with ultrastructural data for S. carpocapsae and S. feltiae. Except for S. bicornutum , all species studied show an

In: Nematology

males, an offset cephalic region with a shallow constriction, delicate stylet 6.6 (6.0-7.0) μ m long with basal swellings, four incisures in the lateral field, female gonoduct bearing a rudimentary PUS less than one body diam. long at vulval region, presence of a sclerotised mass behind the male

In: Nematology

dissec- tions disclosed that 4 of them had testes; 4 others had ootestes and 5 had ovaries. Further, all the specimens had gonoducts and gonopores of both sexes, except in one of those with ovaries, wich had oviducts only. Morphometric analyses of abdomens of normal males and females, in comparison with

In: Crustaceana

includes formation of complexes of fibrous bodies (FB) and membranous organelles (MO) which appear in spermatocytes; the complexes dissociate in the spermatids; the immature sperm contains separate FB and MO and transformation continues only after activation in the female gonoduct. The spermatheca contains

In: Nematology

drawing of reproductive system of non-breeding female Portunus pelagicus (L.), dorsal view. AH, anterior horn of ovary; PH, posterior horn of ovary; GO, gonoduct; TB, transverse bridge. x 3.2. The right sides were used for the study of the gross anatomy under the binocular stereomicroscope either fresh in

In: Crustaceana

gonostomal lips from the coelomic fluid and accumulate in the egg- sac of the female gonoduct. Spermatogenesis and oogenesis are briefly described. Developing oocytes are capped by thimble-like or ovoid aggregations of nurse cells which disappear as eggs mature. The sexually differentiated eggs show Wolanski

In: Netherlands Journal of Zoology

subjected to dehydrating and clearing agents. Its nature and origin are the aim of the present work. This necessitates critical observations and thorough histological and histochemical studies on the gonoduct to investigate properly the fate of its contents after copulation. With this work completed it

In: Crustaceana