The small-subunit rRNA gene sequences of venerids and the phylogeny of Bivalvia

Publication Type:Journal Article
Year of Publication:1999
Authors:A. Canapa, Marota, I., Rollo, F., Olmo, E.
Journal:Journal of Molecular Evolution
Date Published:APR
Accession Number:ISI:000079338600009
Keywords:18S, bivalvia, mollusca, phylogeny

The complete nucleotide sequence of the 18S subunit of ribosomal DNA (rDNA) was determined for the venerid clams Callista chione (Pitarinae) and Venus verrucosa (Venerinae). Comparison of the new sequences with the published sequences of 1 annelid, 2 gastropods, 2 polyplacophorans, and 19 bivalves showed that when the annelids are used as outgroup the gastropods diverge from the bivalves, which form a cluster including the polyplacophorans. When the gastropods alone were compared with the bivalves, the latter split in two groups corresponding to the two subclasses of Heterodonta and Pteriomorpha. The former include two taxa that diverged early, Galeomma and Tridacna, while the Veneridae and Mactridae form two sister groups. In contrast to previous reports and in line with morphological data, the Ostreidae are included in the Pteriomorphia and form a monophyletic group.

URL:<Go to ISI>://000079338600009
Alternate Journal:J Mol EvolJ Mol Evol
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