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J. Moll. Stud. (1999), 65, 335-353
© The Malacological Society of London
1999
Phylogenetic analysis of dorid nudibranchs (Gastropoda: Doridacea) using the mitochondrial 16S rRNA gene
Department of Zoology, Göteborg University, PO Box 463, SE-405 Göteborg, Sweden
A 400 bp region of the mitochondrial 16S rRNA gene was sequenced in 24 dorid nudibranch species. In addition a dendronotid nudibranch and a notaspidean were sequenced for use as outgroup. The sequences were characterized with respect to spatial variation and secondary structure. The data were analysed using parsimony, exploring the effects of alignment and weighting on the optimal hypothesis, and a distance analysis was also performed. The optimal hypotheses differed between the analyses, although the clades with substantial bootstrap proportions were usually present in all cases. These clades are in general congruent with existing classifications, and correspond to relationships within family level taxa. The relationships between these clades were inconclusive and the monophyletic status of higher taxa of particular interest (e.g., Eudoridoidea, Anadoridoidea) could neither be corroborated nor dismissed.
Present address: Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560-0163, USA
(Received 14 May 1998; accepted 29 October 1998)
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