THE KARYOLOGY OF TEREDO UTRICULUS (GMELIN) (MOLLUSCA, PELECYPODA)

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Abstract
By counting spermatocyte and oocyte bivalents and mitotic metaphase chromosomes in cleaving eggs, the haploid (n = 19) and the diploid numbers (2n = 38) were determined, respectively, for the species T. utriculus. An XY and XO sex-determining mechanism is absent in the species under study. Chromosomes cannot be grouped into different classes according to length. For T. utriculus, a high number of chromosomes probably is not necessarily accompanied by a high amount of chromosomal DNA.