Are 28s rDNA and 18s rDNA informative for cephalopod phylogeny?
Cephalopod phylogeny has been explored using part of 28S and 18S ribosomal nuclear genes in a number of coleoid (mainly decapod) and nautiloid species. Two regions of 28S rRNA gene were sequenced: (C1/D1/C2) and (D2). If the first region is unsuitable to discriminate groups of coleoids, the second one, more variable, is more informative and allows support for some monophyletic groups. Sequences obtained from cloning part of 18S rRNA gene have revealed the existence in some species of more than one form of 18S among clones isolated from a single individual. This result questions the concerted evolution concept, and is also of consequence for phylogenetic analyses as using one form or the other may affect phylogenetic results.
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Document Type: Research Article
Publication date: 2002-07-01
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