中国爬岩鳅属鱼类一新种记述(鲤形目,平鳍鳅科)

记述了采自云南省沾益县德泽乡牛栏江水域的平鳍鳅科爬岩鳅属鱼类1新种,牛栏爬岩鳅 Beaufortia niulanensis Chen,Huang et Yang,sp.nov..其特征:背鳍分支鳍条7,腹鳍分支鳍条21,侧线鳞90～95,胸鳍起点相对于鼻孔和眼前缘之间,背鳍起点相对于腹鳍起点至其基部后缘的中点稍后,肛门位于腹鳍基后缘至臀鳍起点间的中点,腹鳍末端接近肛门,这些特征组合可以将新种与同属的其他2个相近种,即四川爬岩鳅B.szechuanensis(Fang)和中间爬岩鳅B.intermedia Tang et Wang区别开来.

云南鱼类三新纪录及驮娘江鱼类的区系存在度分析

2005年8月,对云南富宁县驮娘江流域的鱼类进行了考察,采集到鱼类标本38种,发现云南鱼类3新记录:胡鮈(Huigobio chenhsienensiss Fang)、宽头盘鮈(Discogobio laticeps Chu,Cui & Zhou)、圆体爬岩鳅(Beaufortia cyclica Chen).结合历史记录和中国科学院昆明动物研究所鱼类标本馆馆藏的驮娘江流域的鱼类标本,对驮娘江鱼类的目、科、属三个级别进行区系存在度分析.区系存在度分析显示:一些世界性分布的科和属,在驮娘江分布的种类并不很多,相反.一些具有地方性分布和小的科和属,其区系存在度相对较大.长臀鮠科(Cranoglanididae)为中国华南区一越南特有的科,其区系存在度为100%.结鱼属(Parator)和红鲐属(Erythroculter)为单种属,区系存在度为100%,结鱼属是中国特有属,主要分布在珠江水系,红鲌属鱼类主要分布在亚洲南部.这些地方性分布的小科属更能反映本地区的鱼类区系特征,即亚洲亚热带淡水鱼类区系.

Molecular phylogenetics of the family Cyprinidae (Actinopterygii : Cypriniformes) as evidenced by sequence variation in the first intron of S7 ribosomal protein-coding gene: Further evidence from a nuclear gene of the systematic chaos in the family

The family Cyprinidae is the largest freshwater fish group in the world, including over 200 genera and 2100 species. The phylogenetic relationships of major clades within this family are simply poorly understood, largely because of the overwhelming diversity of the group; however, several investigators have advanced different hypotheses of relationships that pre- and post-date the use of shared-derived characters as advocated through phylogenetic systematics. As expected, most previous investigations used morphological characters. Recently, mitochondrial DNA (mtDNA) sequences and combined morphological and mtDNA investigations have been used to explore and advance our understanding of species relationships and test monophyletic groupings. Limitations of these studies include limited taxon sampling and a strict reliance upon maternally inherited mtDNA variation. The present study is the first endeavor to recover the phylogenetic relationships of the 12 previously recognized monophyletic subfamilies within the Cyprinidae using newly sequenced nuclear DNA (nDNA) for over 50 species representing members of the different previously hypothesized subfamily and family groupings within the Cyprinidae and from other cypriniform families as outgroup taxa. Hypothesized phylogenetic relationships are constructed using maximum parsimony and Basyesian analyses of 1042 sites, of which 971 sites were variable and 790 were phylogenetically informative. Using other appropriate cypriniform taxa of the families Catostomidae (Myxocyprinus asiaticus), Gyrinocheilidae (Gyrinocheilus aymonieri), and Balitoridae (Nemacheilus sp. and Beaufortia kweichotvensis) as outgroups, the Cyprinidae is resolved as a monophyletic group. Within the family the genera Raiamas, Barilius, Danio, and Rasbora, representing many of the tropical cyprinids, represent basal members of the family. All other species can be classified into variably supported and resolved monophyletic lineages, depending upon analysis, that are consistent with or correspond to Barbini and Leuciscini. The Barbini includes taxa traditionally aligned with the subfamily Cyprininae sensu previous morphological revisionary studies by Howes (Barbinae, Labeoninae, Cyprininae and Schizothoracinae). The Leuciscini includes six other subfamilies that are mainly divided into three separate lineages. The relationships among genera and subfamilies are discussed as well as the possible origins of major lineages. (c) 2008 Published by Elsevier Inc.