Evolutionary Relationships of the Blennioid Fish Families Clinidae, Labrisomidae and Chaenopsidae: Congruence Between DNA Sequence and Allozyme Data
The suborder Blennioidei (Teleostei: Perciformes) comprises approximately 675 species of small benthic fishes in 6 families, whose distributions in tropical and temperate marine provinces are of biogeographic significance. Their evolutionary relationships have attracted considerable scientific interest, although resolution at higher taxonomic levels, based on morphological characters, has been inconclusive and one family (Labrisomidae) presently lacks monophyletic definition. In the present study, phylogenetic methodology is used to analyze sequence data from internal transcribed spacer region 1 of the ribosomal DNA array and allozyme data from 40 presumptive gene loci to develop hypotheses of relationships among three of the six families of the Blennioidei (Clinidae, Labrisomidae, and Chaenopsidae), using two of the remaining blennioid families (Tripterygiidae and Blenniidae) as outgroups. Trees generated from PAUP analyses of rDNA sequence data are compared with those generated from allozyme data. Phylogenetic hypotheses based on rDNA sequence and allozyme data are congruent, suggesting that the combined grouping of the Chaenopsidae, Labrisomidae, and Clinidae is monophyletic. The most-parsimonious trees from both allozyme and sequence data suggest that the Chaenopsidae is the sister group to a Labrisomidae and Clinidae clade. Allozyme data suggest that the Labrisomidae, as currently recognized, is paraphyletic. Additional analyses of DNA sequence data are planned to test these relationships. Results of the present study indicate that rDNA data are useful for discerning evolutionary history of the Blennioidei.
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Document Type: Research Article
Publication date: 1993-01-01
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