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Digeneans of the families Opecoelidae and Lepocreadiidae, parasites of Lepidonotothen macrophthalma from the North Scotia Ridge, and remarks on the discrimination of Neolepidapedon magnatestis and N.trematomi

100%

Zdzitowiecki K.

Acta Parasitologica

1999

tom 44

nr 4

Twenty fishes Lepidonotothen macrophthalma (Norman) caught at the North Scotia Ridge were examined. They harboured four digenean species - the opecoelids, Macvicaria antarctica (Kovalyova et Gaevskaya, 1974) and M. skorai sp. n., the lepocreadiid, Neolepidapedon magnatestis (Gaevskaya et Kovalyova, 1976), and the unnamed hemiurid (presently not described). The total prevalence of Digenea (four species) was 55%, intensity range 2-21 and relative density 3.50. M. skorai sp. n., which occurs sympatrically with M. antarctica, is described. M. skorai sp. n. is characterised by the cirrus sac reaching posterior to the ventral sucker, sucker ratio based on mean diameter 1:1.50-1.92 (mean 1.74), oblique arrangement of testes, egg length 0.043-0.055 mm (usually 0.045-0.051 mm) and testes usually obscured dorsally by vitelline follicles. This species is compared with all Antarctic and sub-Antarctic Macvicaria occurring in Perciformes. N. magnatestis is redescribed from the nototheniids L. macrophthalma and L. squamifrons (Günther) and compared with N. trematomi Prudhoe et Bray, 1973. Specimens previously reported by Zdzitowiecki (1990b) as N. magnatestis collected from Trematomus hansoni and T. bernacchii in the South Shetland Islands area and from Dissostichus eleginoides collected off the Shag Rocks (South Georgia area) are considered N. trematomi.

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

80%

Zdzitowiecki K., Cielecka D.

Acta Parasitologica

1997

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.

Ograniczanie wyników

2 Acta Parasitologica

2 Zdzitowiecki K.

1 Cielecka D.

1 1999

1 1997

Wyniki wyszukiwania

Digeneans of the families Opecoelidae and Lepocreadiidae, parasites of Lepidonotothen macrophthalma from the North Scotia Ridge, and remarks on the discrimination of Neolepidapedon magnatestis and N.trematomi

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