Phylogenetic relationships among species ofCalyptogena(Bivalvia: Vesicomyidae) collected around Japan revealed by nucleotide sequences of mitochondrial genes
✍ Scribed by S. Kojima; R. Segawa; T. Kobayashi; T. Hashimoto; K. Fujikura; J. Hashimoto; S. Ohta
- Publisher
- Springer-Verlag
- Year
- 1995
- Tongue
- English
- Weight
- 675 KB
- Volume
- 122
- Category
- Article
- ISSN
- 0025-3162
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✦ Synopsis
Phylogenetic relationships among the seven species of deep-sea giant clams Calyptogena (Bivalvia: Vesicomyidae) collected around Japan were examined using parts of nucleotide sequences of mitochondrial genes for cytochrome oxidase I (COl) and cytochrome oxidase III (COIII) and the encoded amino acid sequences. The seven species were C. soyoae (Sagami Bay), C. fausta (Suruga Bay), C. kaikoi (Nankai Trough), C. nautilei (Nankai Trough), C. phaseoliformis (Japan Trench), C. solidissima (Minami-Ensei Knoll, Okinawa Trough) and Calyptogena sp. (Iheya Ridge, Okinawa Trough). A clear phylogenetic split was observed between one group of three species (C. kaikoi, C. phaseoliformis and C. fausta) and the remaining species. This clustering corresponds to the two previously described subgenera within the genus Calyptogena (Calyptogean and Ectenagena) with the exception of the placement of C. nautilei, which had been placed in the subgenus Ectenagena. Genetic distances between two haplotypes of C. soyoae were 0.043 for the COI region and 0.055 for the COIII region, and three amino acid substitutions were detected within the COIII region. Calyptogena sp. from the Iheya Ridge could be distinguished from one of the two haplotypes (type A) of C. soyoae by only a single nucleotide substitution, a result that suggests Communicated by T. Ikeda, Nagasaki S. Kojima (~).