Karyotypes of

The chromosomes of three commercially important species of veneroid bivalves were studied: Cerastoderma edule (Cardiidae), Venerupis pullastra and Venerupis rhomboides (Veneridae, Tapetinae) using conventional Giemsa staining and morphometric measurements. C. edule showed a diploid chromosome number of 2n=38 and a variable occurrence of supernumerary chromosomes. Its karyotype consists of 12 submetacentric, 4 subtelocentric and 3 telocentric chromosome pairs. The supernumerary chromosomes were easily distinguished by their reduced differentiated size and by their intra and inter-individual variability. C. edule is the first bivalve species where supernumerary chromosomes have been observed. V. ullustra had 2n = 38 with a karyotype including 3 metacentric, 8 submetacentric and 8 subtelocentric chromosome pairs. V. rhomboides had 2n = 38 with a karyotype including 4 metacentric, 8 submetacentric, 4 subtelocentric and 3 telocentric chromosome pairs. Cytotaxonomic relationships are proposed within Tapetinae from comparative analysis of karyotypes of two species studied here and three other species of the same subfamily previously studied.

Auteurs du document :

Ana Insua, Catherine Thiriot-Quiévreux

Obtenir le document :

EDP Sciences

Mots clés :

Chromosome, karyotype, bivalve, Cardiidae, Veneridae, Tapetinae, Chromosome, caryotype, Bivalve, Cardiidae, Veneridae, Tapetinae

Date :

1992-01-15

Format :

text/xml

Source :

https://doi.org/10.1051/alr:1992001