Chromosomal studies on two Egyptian freshwater snails,

This study deals with the karyotype of Cleopatra bulimoides and a Bithynia spp., both belonging to class Gastropoda and subclass Prosobranchia but to two different families, namely Thiaridae and Bithyniidae.The observed diploid chromosome number for Cleopatra was 2n=28, and for Bithynia 2n = 32. The mitotic chromosomes of Cleopatra consisted of four metacentric pairs, eight submetacentric pairs and two telocentric pairs of chromosomes. The mitotic chromosome number of Bithynia snails was six metacentric pairs, four submetacentric pairs, three subtelocentric pairs and three telocentric pairs of chromosomes. Results of the present study have scientific and practical significance complementary to biochemical and molecular studies in animal taxonomy