title: Phylogeny of Glaucosomatidae inferred from molecular evidence.
abstract: Most species of glaucosomatids (Teleostei: Glaucosomatidae) are endemic to Australia, except Glaucosoma buergeri that is widely distributed from Australia to Japan. This study elucidated phylogenetic relationships among glaucosomatids based on the morphological characters of the saccular-otolith sagitta, in addition to molecular evidence of mitochondrial 16S rDNA, cytochrome oxidase I (COI) and cytochrome b (cyt b) sequences, and nuclear rhodopsin sequences. The topologies of individuals' phylogenetic trees, based on 16S rDNA, COI and cyt b sequences, were statistically indistinguishable from one another, and were only slightly different from a tree based on rhodopsin sequences. These molecular tree topologies, however, differed from species relationships in morphology-based phylogenetic hypothesis proposed in previous studies. Specimens of G. buergeri from Australia and Taiwan showed differences in the sagitta and molecular differentiation at the four genes, suggesting a possible speciation event. Both molecular and morphological evidences indicate that Glaucosoma magnificum is the plesiomorphic sister species of other glaucosomatid species. Glaucosoma hebraicum is the sister species of a clade composed of G. buergeri and Glaucosoma scapulare. Molecular and morphological evidences also support the species status of G. hebraicum.
authors.affiliation: Institute of Marine Biology and Asia-Pacific Ocean Research Center, National Sun Yat-sen University, Kaoshiung 80424, Taiwan.
authors.forename: S-H
authors.initials: SH
authors.lastname: Liu
authors.forename: W-B
authors.initials: WB
authors.lastname: Yeh
authors.forename: H-K
authors.initials: HK
authors.lastname: Mok
mesh_terms: D000818:Animals; D001315:Australia; D045303:Cytochromes b / Q000235:genetics; D004272:DNA, Mitochondrial / Q000235:genetics; D003576:Electron Transport Complex IV / Q000235:genetics; D049810:Genetic Speciation; D008969:Molecular Sequence Data; D010473:Perciformes / Q000033:anatomy & histology / Q000145:classification* / Q000235:genetics*; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012243:Rhodopsin / Q000235:genetics; D013624:Taiwan
chemical_list: D004272:DNA, Mitochondrial; D012336:RNA, Ribosomal, 16S; D012243:Rhodopsin; D045303:Cytochromes b; D003576:Electron Transport Complex IV