| 摘要: |
| 采用从GenBank 下载的翼形亚纲11 个总科80个种类的28S 部分序列, 对翼形亚纲11 个总科贝类进行系统发育关系研究。在获得的1252个序列位点中, 去除插入缺失位点, 变异位点共359个, 其中简约位点300 个。翼形亚纲各总科内各种间的遗传距离为0.01 —0.14, 明显小于各总科间的遗传距离( 除蚶总科与拟锉蛤总科, 双肌蛤总科与襞蛤总科以及两总科与贻贝总科外) 。贝叶斯树和最大似然树均支持翼形亚纲为单系群, 并将11 个总科分为3 个聚类簇: 聚类簇Ⅰ为珍珠贝总科(Pterioidea) 、牡蛎总科 (Ostreoidea)和江珧总科(Pinnoidea), 聚类簇Ⅱ为贻贝总科(Mytiloidea)、蚶总科(Arcoidea) 和拟锉蛤总科(Limopsoidea), 聚类簇Ⅲ为襞蛤总科(Plicatuloidea) 、不等蛤总科(Anomioidea) 、双肌蛤总科(Dimyoidea)、扇贝总科(Pectinoidea) 和锉蛤总科(Limoidea) 。根据本研究的结果, 并结合其他学者提出的分类系统, 构建了包括4 目11 总科的翼形亚纲分类系统。 |
| 关键词: 翼形亚纲, 28S rRNA 基因, 分子系统学 |
| DOI：10.11693/hyhz201202024024 |
| 分类号: |
| 基金项目:“十二五”国家科技支撑计划课题资助, 2011BAD13B01 号; 国家海洋局公益性行业科研专项重点项目资助, 200805069 号; 国家自然科学基金项目资助, 40876084 号; 江苏省科技支撑计划(农业部分)资助, BE2008344 号。 |
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| PHYLOGENETIC ANALYSIS OF THE SUBCLASS PTERIOMORPHIA (BIVAVIA) BASED ON PARTIAL 28S rRNA SEQUENCE |
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XUE Dong-Xiu1,2, WANG Hai-Yan1, ZHANG Tao1, ZHANG Su-Ping1, XU Feng-Shan1
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1.Institute of Oceanology , Chinese Academy of Sciences;2.Graduate School, Chinese Academy of Sciences
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| Abstract: |
| The phylogenetic relationships among 11 superfamilies of the subclass Pteriomorphia (Bivavia) were recon-structed based on partial sequences of the nuclear 28S ribosomal DNA retrieved from GenBank. Unambiguously aligned sequences (1252bp) of 80 species were subjected to partitioned maximum likelihood and Bayesian analyses. Sequence analysis showed that there were 359 variable sites, occupying 28.67% of all sites, and 300 parsimony informative sites, occupying 23.96% of all sites. The average content of A+T was 41.6%, obviously lower than G+C, showing that the base compositions were biased in favor of G+C. The genetic distances among species within superfamilies ranged from 0.01 to 0.14, which were obviously smaller than those among superfamilies. The resultant molecular phylogeny was compared with previously published phylogenetic hypotheses inferred from morphological characteristics and other molecular analyses. The molecular phylogenetic analyses strongly supported the monophyly of Pteriomorphia, which were congruent
with previous results of based on morphological characters. Th e resulting trees clearly indicated that the 11 superfamilies were divided into three clades: cladeⅠincluded Pterioidea, Ostreoidea, and Pinnoidea; clade Ⅱincluded Arcoidea, Limop-soidea, and Mytiloidea; and cladeⅢincluded Pectinoidea, Anomioidea, Dimyoidea, Plicatuloidea, and Limoidea. Based on the results of the present study and information compiled from other’s classification system, a revised classification of the extant superfamilies of Pteriomorphia is presented. |
| Key words: Pteriomorphia, 28S rRNA genes, Molecular phylogeny |
