中国喇叭螺属的系统发育关系和生物地理学初探(肺螺亚纲:柄眼目:虹蛹螺科)

本文运用支序分析方法和H enn ig86软件探讨了柄眼目虹蛹螺科喇叭螺属中国种类的系统发育关系。中国喇叭螺属种类现已知17种,主要分布于我国长江流域和秦岭以南的地区。选择H.tubif erum和G.hung erf ord ianus作为外群,运用命令ie*对原始数据集进行运算,并进行逐步加权处理,结果共得到步长=115,C I值=74,R I值=90的同等简约树2株,选择其中具有较少未解决系统关系的一株作为支序分析的首选支序图。支序分析的结果将中国喇叭螺属的17个种初步分为两组:喇叭螺组和贝喇叭螺组。贝喇叭螺组包括B.p licid ens和B.hubeina,喇叭螺组包括剩余的15种。该结果与J.T he le(1931)将喇叭螺属分为喇叭螺指名亚属和贝喇叭螺亚属相符。根据首选支序图,运用扩散-隔离分析方法对该属的动物地理学进行了分析和讨论,认为中国喇叭螺属现有分布格局的形成可能与青藏高原的隆起有关。

Preliminary Study on Phylogenetic Relationships and Zoogeography of Genus Boysidia Ancey,1881(Stylommatophora:Pupillidae) From China

The phylogeny of Chinese Boysidia has been investigated by cladistic methods using the Hennig 86 program(Version 1.5).Seventeen morphological characters were used in this analysis.Hypselostoma tubiferum and Gyliauchen hungerfordianus were chosen as outgroups.The preferred parsimonious cladogram was calculated by the command ie~* with progressive weighting method.In the resulting phylogenetic reconstruction,Seventeen Chinese species of genus Boysidia were divided into two groups that supported the proposition of J.Thiele(1931).On the basis of the Dispersal-Vicariance analysis,a historical biogeographical scenario was hypothesized: the form of the present distribution pattern of Boysidia in China may be related to the most strong uplift of Qinghai-Tibet Plateau.