COMPARATIVE KARYOLOGY OF THE FRESHWATER SNAILS BULINUS TROPICUS and B. NATALENSIS
- 1 September 1980
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Genetics and Cytology
- Vol. 22 (3), 361-367
- https://doi.org/10.1139/g80-044
Abstract
Species of the subgenus Bulinus occur in a polyploid series which is of interest because of the rarity of polyploidy in animal species and because there appears to be a relation between ploidy level and ability to transmit Schistosoma haematobium, a parasite of major [human] public health importance. A technique is described for the preparation of standard karyotypes using cell suspensions from colchicine-treated embryos. The results for 2 diploid species, B. tropicus (Krauss) and B. natalensis (Kuster), are presented. Both karyotypes consist of 15 metacentric and 3 submetacentric chromosomes. Differences in centromere position are found in 4 pairs of chromosomes, and in the appearance of a secondary constriction. Because B. natalensis may represent a relict taxon involved in the origin of the polyploids, the results are of significance for future work on the phylogeny of this group.This publication has 9 references indexed in Scilit:
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