Chromosomes of 6 bivalve species were studied from mitotic metaphases using cell suspension techniques. Among Family Mytilidae,
Modiolus barbatus (Linnaeus 1758) has a diploid chromosome number of 2
n=32 with 5 metacentric, 2 submetacentric, 5 subtelocentric and 4 telocentric chromosome pairs,
Septifer excisus (Wiegmann 1837) has 2
n=26 with 9 metacentric, 2 submetacentric, and 2 telocentric chromosome pairs and
Septifer bilocularis (Linnaeus 1758) also has 2
n=26 with 8 metacentric, 2 submetacentric and 3 subtelocentric chromosome pairs. Among Family Veneridae,
Ruditapes decussatus (Linnaeus 1758) has 2
n=38 with 6 metacentric, 5 submetacentric, 3 subtelocentric and 5 telocentric chromosome pairs,
Circe scripta (Linnaeus 1758) has 2
n=38 with 6 metacentric, 6 submetacentric, 4 subtelocentric and 3 telocentric chromosome pairs and
Venus verrucosa (Linnaeus 1758) has also 2
n=38 with 7 metacentric, 4 submetacentric, 4 subtelocentric and 4 telocentric chromosome pairs. These results are reported for the first time in Egypt.
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