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Biol Bull 129: 181-188. (August 1965)
© 1965 Marine Biological Laboratory
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CHROMOSOMES OF TWO SPECIES OF QUAHOG CLAMS AND THEIR HYBRIDS

R. WINSTON MENZEL 1 and MARGARET Y. MENZEL 1

1 Oceanographic Institute and Department of Biological Science, The Florida State University, Tallahassee, Florida 32306

Chromosome numbers of n = 19, 2n = 38 are reported for Mercenaria mercenaria, M. campechiensis and their F1 hybrids. Meiosis is normal in the hybrids and yields no evidence of chromosome nonhomology or structural rearrangements between the two parents. The hybrids produce functional eggs and sperm which result in normal fertilization and early embryonic divisions in reciprocal backcrosses and at least some F2' s. No gross chromosomal barrier to gene exchange appears to exist between the two species.






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