基于18S rDNA序列研究腺介虫亚目系统发育关系

基于1 720 bp的18S rRNA基因序列以Darwinula sp.和Cytherelloidea. munechikai为外群,采用最大简约法（MP法）和邻接法（NJ法）对腺介虫亚目（Cypridocopina）3总科5科9种动物的系统发育关系进行了分析.结果表明：1） 现生腺介虫亚目动物为单系群；2） 两种营海水生活的介形类—海介虫总科（Pontocypridoidea）和大介虫总科（Macrocypridoidea）间的亲缘关系较近；3） 现生腺介虫总科（Cypridoidea）也为单系群，但该总科内各科间关系较复杂，主要分为两支，其中腺介虫科的Dolerocypris sp.与萤光介虫科的Candona holzkanpfi聚成一支；而萤光介虫科的Cypria crenulata和泥介虫科的Ilyocypris. angulata同时与腺介虫科其它动物聚为一支.

Preliminary Study on Phylogenetic Relationships of Cypridocopina (Ostracoda: Podocopida) Based on 18S rDNA Sequences

Nucleotide sequences for the 18S rDNA (1 720 bp) of 11 ostracoda species, representing 3 superfamilies and 5 families, were analyzed based on maximum parsimony （MP） and neighbor joining （NJ）. The topologies of phylogenetic relationships gained by two analytic methods are similar. The results shown: 1） Cypridocopina forms a monophyletic group; 2）Close rationship between Pontocypridoidea and Macrocypridoidea can be postulated; 3）Cypridoidea is considered as a monophyletic group, but the rationships among cypridoidean families could not be resolved from 18S rDNA.