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Biol Bull 165: 450-457. (October 1983)
© 1983 Marine Biological Laboratory
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THE KARYOLOGY OF TEREDO UTRICULUS (GMELIN) (MOLLUSCA, PELECYPODA)

R. VITTURI 1, A. MAIORCA 1, and E. CATALANO 1

1 Institute of Zoology, University of Palermo, Italy

By counting spermatocyte and oocyte bivalents and mitotic metaphase chromosomes in cleaving eggs, we have determined both the haploid (n = 19) and the diploid numbers (2n = 38) respectively, for the species Teredo 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. It seems that, for Teredo utriculus, a high number of chromosomes is not necessarily accompanied by a high amount of chromosomal DNA.

Submitted on June 29, 1983
Accepted on July 18, 1983






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