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3 Acta Parasitologica

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Elektron microscope study on vitellogenesis in Catenotaenia pusilla [Goeze, 1782] [Cyclophyllidea, Catenotaeniidae]

100%

Swiderski Z. , Chomicz L. , Grytner-Ziecina B. , Tkach V. V.

Acta Parasitologica

2000

tom 45

nr 2

The vitellogenesis in Catenotaenia pusilla was examined by means of electron microscopy. Mature vitelline follicles consist of cells in various stages of development, progressing from immature cells of gonial type near the periphery to mature vitellocytes towards the centre. Maturation is characterised by: (1) increase in cell volume; (2) extensive development of large parallel cisternae of GER, the vitelline material producing units; (3) development of Golgi complexes engaged in vitelline material package; (4) continuous fusion of small vesicles into larger vitelline vesicles and fusion of these into 3 very large vesicles, which are characteristic for mature vitellocytes of this tapeworm. Vitellogenesis in C. pusilla is compared with that in other cestodes. Some conclusions concerning the interrelationship between the vitellogenesis pattern and the type of embryogenesis are drawn and discussed.

Digenetic trematodes of marine fishes from Suva, Fiji [Cryptogonimidae] including description of a new species

67%

Nahhas F. M. , Tran M. , Nguyen T. P.

Acta Parasitologica

2003

tom 48

nr 3

Four species of digenetic trematodes representing the family Cryptogonimidae are reported: Paracryptogonimus acanthostomus Yamaguti, 1934 from Lutjanus fulviflamma (new host and geographic record), P. provitellosus Durio et Manter, 1969 from L. fulvus (new host and geographic record), P. brevicaecum sp. nov. from L. fulvus and Neoparacryptogonimus ovatus (Yamaguti, 1952) from L. fulviflamma (new host and geographic record). Paracryptogonimus brevicaecum can be distinguished from all species of Paracryptogonimus chiefly by its short caeca, and from P. provitellosus occurring in the same fish host, in its spherical shape, the distribution of the vitelline follicles, and the more posterior position of the ovary relative to the testes.

Digenea of fishes of the Weddell Sea. III. The Lepocreadiidae [genera Neolepidapedon and Lepidapedon], parasites of Notothenioidea

67%

Zdzitowiecki K. , Cielecka D.

tom 42

nr 2

Three lepocreadiid digenean species of two genera, Neolepidapedon Manter, 1954 and Lepidapedon Stafford, 1904, occur in notothenioid fishes of the genera Trematomus (Nototheniidae), Artedidraco and Pogonophryne (both Artedidraconidae), Bathydraco and Prionodraco (both Bathydraconidae) in the Weddell Sea. Descriptions of all species, including a new one and two previously recorded in the high Antarctic, are given. Neolepidapedon trematomi Prudhoe et Bray, 1973 is recorded in 4 host species, three of the genus Trematomus (2 new host species) and Pogonophryne permitini (new host species and family), for the first time in the Weddell Sea and south to 70°S. Lepidapedon garrardi (Leiper et Atkinson, 1914) and L. balgueriasi sp. n. belong to the “Beveridgei subgroup” of Bray and Gibson (1995). L. garrardi has the excretory vesicle reaching to the level of the border between the testes and it is transferred to this subgroup from the “Garrardi subgroup”, which is renamed to the “Zubchenkoi subgroup”. This species is recorded in 9 host species (7 new hosts), for the first time in the Weddell Sea. L. balgueriasi sp. n. is recorded in 4 species of the genus Trematomus, including T. loennbergi (type-host). This species has eggs similar in number and size to L. garrardi (egg length exceeding 0.1 mm), but it has relatively smaller suckers and pharynx, and vitelline follicles confluent in the forebody and dorsally to the testes; its site is in the pyloric caeca and anterior part of the small intestine. A key to species of the “Beveridgei subgroup” of the genus Lepidapedon is given.