Nom du corpus

Corpus Systématique Animale

Titre du document

Etude morpho-anatomique et génétique de deux nouveaux Proteocephalus Weinland, 1858 (Cestoda: Proteocephalidae) parasites de Platydoras costatus (L.), poisson siluriforme du Paraguay

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Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Nom du fichier dans la ressource
Vers_v2b_00520
Auteur(s)
  • Alain de Chambrier 1
  • Claude Vaucher 1
Affiliation(s)
  • 1) Muséum d'Histoire naturelle, case postale 6434, 1211, Genève 6, Suisse
Résumé

The cat-fish Platydoras costatus (L.) is abundantly parasitised by the cestode genus Proteocephalus in Paraguay, previously unrecorded from this host. Morpho-metrical studies suggest the presence of two species, Proteocephalus soniae n. sp. and P. renaudi n. sp. They differ in the scolex, the distribution of the testes, the mean number of testes and uterine diverticula, the presence or absence of a vaginal sphincter, and the shape of the eggs and their envelopes. A single specimen, representing a possible third taxon, is morphologically similar to P. renaudi. Data from protein electrophoresis on amidon gel confirm the morpho-metrical conclusions. Of the 13 enzymes investigated, ACP, AAT, GPI and MDH have alleles of different electrophoretic mobilities in the three taxa. Only two alleles are distinguishable on locus HK. There is no evidence of heterozygotes in the tested systems. The specific status of the examined taxa is therefore confirmed. More material of the third species is required for establishing a species definition. P. renaudi has following unique anatomical features: the egg bears an enormous external envelope and an elongate embryophore with a unilateral appendix; the vitelline glands are paramuscular; and the eggs, laid in packets, are evacuated in an unusual way. The establishment of species based on protein electrophoresis allows a critical examination of the validity of anatomical characters usually used for taxonomic purpose. Good specific characters are the presence or absence of an apical organ and a vaginal sphincter and the relatively constant ratio between ovary width and the width of mature proglottids. The number of testes and uterine diverticula, both frequently used in species diagnoses, show variations which are often considerable and are, therefore, less unequivocal. The coefficients of variation observed calculating the mean numbers of testes can be high and reach up to 28%. This variation is itself a specific character in our opinion.

Catégories Science-Metrix
  • 1 - health sciences
  • 2 - biomedical research
  • 3 - mycology & parasitology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - genetique des eucaryotes. evolution biologique et moleculaire
Catégories Scopus
  • 1 - Life Sciences ; 2 - Immunology and Microbiology ; 3 - Parasitology
Catégories WoS
  • 1 - science ; 2 - parasitology
Identifiant ISTEX
FF4D63CCF34E0E0C4744E414D73AEFB0DC8B7374
Revue

Systematic Parasitology

Année de publication
1994
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
9.848
Sous-corpus
  • Vers
Type de publication
Journal
ark:/67375/1BB-18P7GM9M-Z
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