Comparative karyology of the freshwater snails Bulinus tropicus and B. natalensis.

M. A. Goldman, P. T. LoVerde, C. L. Chrisman

Research output: Contribution to journalArticle

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Abstract

Species of the subgenus Bulinus s.s. 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 public health importance. We describe a technique for the preparation of standard karyotypes using cell suspensions from colchicine-treated embryos. The results for two diploid species, B. tropicus (Krauss) and B. natalensis (Küster), are presented. Both karyotypes consist of 15 metacentric and 3 submetacentric chromosomes. However, differences in centromere position are found in four 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 of significance for future work on the phylogeny of this group.

Original languageEnglish (US)
Pages (from-to)361-367
Number of pages7
JournalCanadian journal of genetics and cytology. Journal canadien de génétique et de cytologie
Volume22
Issue number3
DOIs
StatePublished - 1980

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ASJC Scopus subject areas

  • Genetics
  • Plant Science
  • Cell Biology

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