Rosel P E, Haygood M G, Perrin W F
Scripps Institution of Oceanography, Marine Biology Research Division, University of California, San Diego 92093-0202, USA.
Mol Phylogenet Evol. 1995 Dec;4(4):463-74. doi: 10.1006/mpev.1995.1043.
Portions of the cytochrome b gene and control region of the mitochondrial DNA molecule were sequenced to investigate systematic relationships among the six extant species of true porpoises, (Cetacea: Phocoenidae). Phylogenetic analyses of mitochondrial cytochrome b sequences support a close relationship between Burmeister's porpoise, Phocoena spinipinnis, and the vaquita, Phocoena sinus, and the association of these two species with the spectacled porpoise, Australophocaena dioptrica. The latter result is not in concordance with a recent morphological reclassification which groups A. dioptrica with Dall's porpoise, Phocoenoides dalli, in the subfamily Phocoenoidinae. The molecular analysis found no support for this grouping. A. dioptrica was originally described as a member of the genus Phocoena, and our results support returning it to that genus at this time. Finally, the data suggest that the tropical species Neophocaena phocaenoides, the finless porpoise, may represent the most basal member of the family. The control region sequences corroborated the relationships among the closely related taxa P. sinus, P. spinipinnis, and A. dioptrica, but were unable to resolve the deeper branches of the tree, probably as a result of a high level of saturation of these sequences.
对线粒体DNA分子的细胞色素b基因部分和控制区进行测序，以研究六种现存真鼠海豚（鲸目：鼠海豚科）之间的系统发育关系。线粒体细胞色素b序列的系统发育分析支持了南美鼠海豚（Phocoena spinipinnis）和小头鼠海豚（Phocoena sinus）之间的密切关系，以及这两个物种与眼镜鼠海豚（Australophocaena dioptrica）的关联。后一结果与最近的形态学重新分类不一致，后者将眼镜鼠海豚与白腰鼠海豚（Phocoenoides dalli）归为鼠海豚亚科。分子分析未发现支持这种分组的证据。眼镜鼠海豚最初被描述为鼠海豚属的成员，我们的结果支持此时将其归回该属。最后，数据表明热带物种窄脊江豚（Neophocaena phocaenoides），即无鳍鼠海豚，可能代表了该科最基部的成员。控制区序列证实了小头鼠海豚、南美鼠海豚和眼镜鼠海豚这些亲缘关系密切的类群之间的关系，但无法解析该树状图中更深层次的分支，这可能是由于这些序列的高度饱和所致。
