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1

Estimation of the prevalence of outcrossing in the hermaphrodite trematode Lecithochirium rufoviride by allozyme analysis

100%
Vilas R., Paniagua E.
Acta Parasitologica
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2004
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tom 49
|
nr 1
The relative occurrence of outcrossing in two geographical populations of the digenetic trematode Lecithochirium rufoviride was investigated using starch gel electrophoresis to study the polymorphic locus Pgm-1. Assuming that the effects of mutation, genetic drift and natural selection on this locus are negligible, allozyme variation suggests the occurrence of extensive outcrossing in both populations, Ria de Arousa and Lianes (North of Spain). Therefore, the minimum outcrossing rate giving no statistically significant deviation respect to Hardy-Weinberg equilibrium was 70% and 66%, respectively. Despite of the asexual reproduction in the snail host, the possibility of self-fertilization as a component of the breeding system of this hermaphroditic helminth, and a population reproductive structure probably influenced by the habitat fragmentation, these results suggest that populations of this species in the definitive host, the European conger eel (Conger conger), are basically panmictic.
2

Quaternary structure of enzymes in trematodes of the genus Lecithochirium: inference from allozymic patterns

100%
Vilas R., Paniagua E., Sanmartin M. L.
Acta Parasitologica
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2002
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tom 47
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nr 4
The quaternary structure of ten enzymes in hemiurid flukes of the genus Lecithochirium (Digenea, Hemiuridae) was inferred using allozyme electrophoresis. Allozyme variants with single-banded homozygotes and double-banded heterozygotes characteristic of monomeric enzymes were observed for aconitase, adenosine deaminase and phosphoglucomutase. The phenotypic variation (single-banded and triple-banded profiles) detected for glucose phosphate isomerase, isocitrate dehydrogenase, phosphogluconate dehydrogenase and malate dehydrogenase, suggest a dimeric structure for these enzymes. These results are consistent with structures already known for invertebrates, including parasitic helminths. Atypical heterozygote patterns were observed for fumarase and malic enzyme, both of which revealed monomeric profiles. Moreover, in the genus Lecithochirium, both monomeric and dimeric isozymes for hexokinase may be present. However, there are other possible explanations for the unusual triple-banded pattern detected for this enzyme. The results are discussed in the context of possible variations in subunit number of homologous enzymes within phylogenetically diverse groups such as parasitic helminths, and compared with those of previous studies using allozyme analysis.
3

Two cystidicolids [Nematoda, Cystidicolidae] from marine fishes off New Caledonia

67%
Moravec F., Justine J.-L.
Acta Parasitologica
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2009
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tom 54
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nr 4
341-349
Two nematode species of the family Cystidicolidae were collected from the digestive tract of marine fishes off New Caledonia, South Pacific: Ascarophis adioryx Machida, 1981 from the stomach of the speckled squirrelfish Sargocentron spiniferum and the sabre squirrelfish Neoniphon sammara (new host record) (both Holocentridae, Beryciformes), and a Spinitectus sp. female, morphologically similar to S. beaveri Overstreet, 1970, from the roundjaw bonefish Albula glossodonta (Albulidae, Albuliformes). Based on light and scanning electron microscopy examinations, A. adioryx is redescribed and a new subgenus Dentiascarophis subgen. nov., characterized by the presence of one dorsal and one ventral median protrusions in the mouth, is established to accommodate it; a key to subgenera of Ascarophis is provided. Ascarophis holocentri Parukhin, 1984 is considered a junior synonym of A. adioryx. The cephalic structure of Spinitectus sp. and S. beaveri is very different from those in other congeners and, therefore, a new subgenus Paraspinitectus subgen. nov., characterized by highly reduced pseudolabia, is erected to accommodate these species. The hemiurid digenean Lecithochirium cirrhiti (Manter et Pritchard, 1960) Yamaguti,1970 was found in the stomach of three species of squirrelfishes. Findings of A. (D.) adioryx, Spinitectus (P.) sp. and L. cirrhiti in New Caledonian waters represent new geographical records of these parasites.
4

Digenea of the fish, Macrourus holotrachys [Gadiformes, Macrouridae] from the North Scotia Ridge, sub-Antarctic

67%
Zdzitowiecki K., Cielecka D.
Acta Parasitologica
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1998
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tom 43
|
nr 4
Four digenean species were found in fish of the species Macrourus holotrachys caught at the North Scotia Ridge, sub-Antarctic. Gibsonia hastata Gaevskaya et Rodyuk, 1988 and Lepidapedon lepidum Gaevskaya et Rodyuk, 1988 are redescribed and figured based on new material and reexaminations of the type-specimens. L. lepidum possesses uroproct and therefore is transferred into the genus Pąralepidapedon. Gonocerca phycidis Manter, 1925 and Lecithochirium sp. (probably unknown species) are briefly described and figured. M. holotrachys is a new host for all these parasites.
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