Perleididae is a group of stem neopterygian fishes known only from the Triassic.Here,we report the discovery of a new perleidid,Teffichthys wui sp.nov.,based on six well-preserved specimens from the late Smithian(Olen...Perleididae is a group of stem neopterygian fishes known only from the Triassic.Here,we report the discovery of a new perleidid,Teffichthys wui sp.nov.,based on six well-preserved specimens from the late Smithian(Olenekian,Early Triassic)marine deposits of Jurong,Jiangsu and Chaohu,Anhui,China.This new discovery documents the third and youngest species of Teffichthys,which is slightly younger than the Dienerian(Induan)T.elegans from Guizhou and the early Smithian T.madagascariensis from Madagascar.The new species shows diagnostic features of Teffichthys(presence of a spiracular,38-41 lateral line scales,and no more than three epaxial rays in the caudal fin)but differs from T.madagascariensis and T.elegans in some autapomorphies(e.g.,a horizontal opercle/subopercle contact and smooth scales with a nearly straight posterior margin).The diagnostic features for the genus Teffichthys and the family Perleididae are emended based on detailed comparisons of the new taxon with other perleidids.The phylogenetic relationships of perleidids with other stem neopterygians are discussed using a cladistic approach,and the results provide new insights into the phylogeny and classification of main stem neopterygian clades.展开更多
随着我国社会经济的快速发展,送变电工程项目逐渐增加,而由于送变电工程项目的特点使得提升送变电工程项目安全管理水平至关重要。基于此,研究提出一种基于社会网络分析的分析方法。首先以一个工程项目所涉及到的部门人员构建评价指标,...随着我国社会经济的快速发展,送变电工程项目逐渐增加,而由于送变电工程项目的特点使得提升送变电工程项目安全管理水平至关重要。基于此,研究提出一种基于社会网络分析的分析方法。首先以一个工程项目所涉及到的部门人员构建评价指标,进行问卷调查;然后进行数据验证与筛选,应用社会网络分析软件UCINET构建送变电工程项目模型,对220 k V安江送变电工程项目进行网络密度分析、派系分析和点度中心度分析;最后通过实例分析验证得出此模型的可行性,并得出提升送变电工程项目安全管理水平的策略和建议。展开更多
文摘Perleididae is a group of stem neopterygian fishes known only from the Triassic.Here,we report the discovery of a new perleidid,Teffichthys wui sp.nov.,based on six well-preserved specimens from the late Smithian(Olenekian,Early Triassic)marine deposits of Jurong,Jiangsu and Chaohu,Anhui,China.This new discovery documents the third and youngest species of Teffichthys,which is slightly younger than the Dienerian(Induan)T.elegans from Guizhou and the early Smithian T.madagascariensis from Madagascar.The new species shows diagnostic features of Teffichthys(presence of a spiracular,38-41 lateral line scales,and no more than three epaxial rays in the caudal fin)but differs from T.madagascariensis and T.elegans in some autapomorphies(e.g.,a horizontal opercle/subopercle contact and smooth scales with a nearly straight posterior margin).The diagnostic features for the genus Teffichthys and the family Perleididae are emended based on detailed comparisons of the new taxon with other perleidids.The phylogenetic relationships of perleidids with other stem neopterygians are discussed using a cladistic approach,and the results provide new insights into the phylogeny and classification of main stem neopterygian clades.
文摘随着我国社会经济的快速发展,送变电工程项目逐渐增加,而由于送变电工程项目的特点使得提升送变电工程项目安全管理水平至关重要。基于此,研究提出一种基于社会网络分析的分析方法。首先以一个工程项目所涉及到的部门人员构建评价指标,进行问卷调查;然后进行数据验证与筛选,应用社会网络分析软件UCINET构建送变电工程项目模型,对220 k V安江送变电工程项目进行网络密度分析、派系分析和点度中心度分析;最后通过实例分析验证得出此模型的可行性,并得出提升送变电工程项目安全管理水平的策略和建议。
