Cytogenetics of the razor clam Solen marginatus (Mollusca: Bivalvia: Solenidae)

摘要

The razor clam Solen marginaus has a diploid chromosome number of 38. The karyotype consists of one metacentric/submetacentric, three submetacentric/metacentric, five submetacentric, one submetacentric/subtelocentric, one subtelocentric/submetacentric, sic subtelocentric and two telocentric chromosome pairs. Staining with chromomycin A_3 revealed bright positive bands subcentromerically in the long arms of one medium-sized subtelocentric pair, while DAPI staining showed uniform fluorescence in all chromosomes o the complement. Fluorescence in situ hybridization using an 18S-5. 8S-28S rDNA probe locates these loci at the subcentromeric region of one subtelocentric pair and at the subtelomeric region of another subtelocentric pair.