CHROMOSOME KARYOTYPES OF THREE BIVALVES: THE OYSTERS, ISOGNOMON ALATUS AND PINCTADA IMBRICATA, AND THE BAY SCALLOP, ARGOPECTEN IRRADIANS

¹ National Pearl Research Laboratory, Kashikojima, Mie, Japan

Chromosome number and morphology were observed in the squashed eggs and embryos of three bivalve species, Isognomon alatus, Pinctada imbricata and Argopecten irradians irradians. I. alatus has 14 pairs of chromosomes, all of which are either meta- or submetacentrics. Three or four of 14 chromosomal pairs of P. imbricata are subtelocentrics and the rest are submeta- or metacentrics. The chromosome complement of P. imbricata seems to be similar to that of P. fucata. Chromosome numbers of A. i. irradians are 16 (n) and 32 (2n) and are different from those of six Pectinidae species previously reported. The 16 pairs of chromosomes of A. i. irradians appear to consist of meta-, submeta-, subtelo-, and telocentrics.

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