{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,24]],"date-time":"2025-10-24T13:03:14Z","timestamp":1761310994125},"reference-count":23,"publisher":"Canadian Science Publishing","issue":"3","license":[{"start":{"date-parts":[[1980,9,1]],"date-time":"1980-09-01T00:00:00Z","timestamp":336614400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.nrcresearchpress.com\/page\/about\/CorporateTextAndDataMining"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Can. J. Genet. Cytol."],"published-print":{"date-parts":[[1980,9,1]]},"abstract":"<jats:p> 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 (K\u00fcster), 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 are of significance for future work on the phylogeny of this group. <\/jats:p>","DOI":"10.1139\/g80-044","type":"journal-article","created":{"date-parts":[[2014,11,28]],"date-time":"2014-11-28T15:17:41Z","timestamp":1417187861000},"page":"361-367","source":"Crossref","is-referenced-by-count":7,"title":["COMPARATIVE KARYOLOGY OF THE FRESHWATER SNAILS <i>BULINUS TROPICUS<\/i> and <i>B<\/i>. <i>NATALENSIS<\/i>"],"prefix":"10.1139","volume":"22","author":[{"given":"Michael A.","family":"Goldman","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Philip T.","family":"LoVerde","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Charles L.","family":"Chrisman","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"155","reference":[{"key":"p_1\/p_1_1","first-page":"4","author":"Babrakzai N.","year":"1974","journal-title":"Inc. 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