To clarify cuttlefish phylogeny, mitochondrial cytochrome c oxidase subunit I (COI) gene and partial 16S rRNA geneare sequenced for 13 cephalopod species. Phylogenetic trees are constructed, with the neighbor-joining ...To clarify cuttlefish phylogeny, mitochondrial cytochrome c oxidase subunit I (COI) gene and partial 16S rRNA geneare sequenced for 13 cephalopod species. Phylogenetic trees are constructed, with the neighbor-joining method.Coleoids are divided into two main lineages, Decabrachia and Octobrachia. The monophyly of the order Sepioidea,which includes the families Sepiidae, Sepiolidae and Idiosepiidae , is not supported. From the two families ofSepioidea examined, the Sepiolidae are polyphyletic and are excluded from the order. On the basis of 16S rRNA andamino acid of COI gene sequences data, the two genera (Sepiella and Sepia) from the Sepiidae can be distinguished, butdo not have a visible boundary using COI gene sequences. The reason is explained. This suggests that the 16S rDNAof cephalopods is a precious tool to analyze taxonomic relationships at the genus level, and COI gene is fitter at ahigher taxonomic level (i.e., family).展开更多
1 Introduction As one of the major groups in the Great Ordovician Biodiversification Event(GOBE),cephalopods may have played a critical role in the marine ecosystem in late Cambrian and Ordovician.Among the few predat...1 Introduction As one of the major groups in the Great Ordovician Biodiversification Event(GOBE),cephalopods may have played a critical role in the marine ecosystem in late Cambrian and Ordovician.Among the few predators in the Ordovician,cephalopods are typified by their big sizes and the development of swimming ability.展开更多
文摘To clarify cuttlefish phylogeny, mitochondrial cytochrome c oxidase subunit I (COI) gene and partial 16S rRNA geneare sequenced for 13 cephalopod species. Phylogenetic trees are constructed, with the neighbor-joining method.Coleoids are divided into two main lineages, Decabrachia and Octobrachia. The monophyly of the order Sepioidea,which includes the families Sepiidae, Sepiolidae and Idiosepiidae , is not supported. From the two families ofSepioidea examined, the Sepiolidae are polyphyletic and are excluded from the order. On the basis of 16S rRNA andamino acid of COI gene sequences data, the two genera (Sepiella and Sepia) from the Sepiidae can be distinguished, butdo not have a visible boundary using COI gene sequences. The reason is explained. This suggests that the 16S rDNAof cephalopods is a precious tool to analyze taxonomic relationships at the genus level, and COI gene is fitter at ahigher taxonomic level (i.e., family).
基金supported by the Chinese Academy of Sciences(Grant Nos.XDB26000000,XDB10010100)the Ministry of Science and Technology of China(Grant Nos.2013FY111000,2017ZX05036-001-004)+1 种基金the National Natural Science Foundation of China(Grant No.41772005)IGCP project 653’The Onset of the Great Ordovician Biodiversification Event’.
文摘1 Introduction As one of the major groups in the Great Ordovician Biodiversification Event(GOBE),cephalopods may have played a critical role in the marine ecosystem in late Cambrian and Ordovician.Among the few predators in the Ordovician,cephalopods are typified by their big sizes and the development of swimming ability.
