中鲤亚属的分支系统学分析

基于外部形态特征和内部骨骼特征对鲤科鲤属中鲤亚属进行了分支系统学分析，内群包括中鲤亚属的全部5种和鲤亚属的2种鱼类，外群采用乌原鲤。在鲤属鱼类和外群间共有48个性状存在变化。系统发育分析采用PAUP^*软件的Parsimony和Bootstrap两种方式的Branch-and-Bound算法，排除不能极化的特征和特有离征之后，还有28个特征可用，由这28个特征可得到唯一的系统树，树长69，一致性系数0.7246，排除无用特征的一致性系数0.6122，保留系数0.6346。由5种中鲤组成的中鲤亚属明显不构成一个单系群。结果表明：中鲤亚属是一个复系群，该类元应该被撤销。

Cladistic Analysis of the Cyprinid Subgenus Cyprinus (Mesocyprinus) Fang (Teleostei: Cyprinidae)

Phylogeny of the cyprinid subgenus Cyprinus (Mesocyprinus) is elucidated based on both external and osteological features. All five species of Cyprinus (Mesocyprinus) are including in the ingroup in addition to two Cyprinus (Cyprinus) species. Procypris merus was treated as outgroup in comparison. A total of 48 characters were identified as variable among ingroup and outgroup. Phylogenetic analysis was accomplished using Parsimony and Bootstrap methods with Branch-and-Bound search of PAUP*. There are 28 characters remaining useful after excluding unpolarized characters and autapomorphies of terminal taxa. Analysis of the characters resulted in one tree with a length of 69 steps, Consistency Index (CI) of 0.7246, CI excluding uninformative characters of 0.6122, and Retention Index (RI) of 0.6346. It is apparent that the Mesocyprinus group consisting of five species is a polyphyletic group. This result suggests that subgenus Cyprinus (Mesocyprinus) should be suspended.