D. Manfio, I. Jorge, G. Kergoat, C. S. Ribeiro-Costa
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A total of 22 species were examined: 16 Ctenocolum species (including the three new ones) and six outgroup bruchine species (from genera Caryedes Hummel, Meibomeus Bridwell, Pygiopachymerus Pic and Pachymerus Thunberg). All resulting trees support the monophyly of the genus Ctenocolum. Three synapomorphies characterize the genus: (i) head with frontal carina enlarged at base, (ii) male pygidium truncated apically, and (iii) lateral lobes of tegmen with dorsal process. The two known species groups are also recovered monophyletic in the parsimony analyses. The following three species are described: Ctenocolum inmaculatus Manfio & Ribeiro-Costa sp. nov. (Type locality: Venezuela, Guarico), which belongs to the group tuberculatum; Ctenocolum nigronotus Manfio & Ribeiro-Costa sp. nov. (Type locality: Porto Rico, Mayaguez) and C. pallidus Manfio & Ribeiro-Costa sp. nov. (Type locality: Republic of Guyana), which belong to the group podagricus. 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引用次数: 4
摘要
Kingsolver&Whitehead的种子甲虫属是独特的,因为它的首选宿主Lonchocharpus Kunth(Fabaceae)不会被其他物种捕食。本研究调查了该属及其物种群的系统发育关系和进化,同时提供了三个新种和C.biolleyi Kingsolver&Whitehead雄性的描述。为了推断系统发育关系,使用简约和贝叶斯推理组装并分析了40个形态特征的特征矩阵。还进行了寄主植物使用的祖先状态估计和生物地理学分析。共检测了22个物种:16个Ctenocolum物种(包括3个新物种)和6个外群bruchine物种(来自Caryedes Hummel属、Meibomeus Bridwell属、Pygiopachymerus Pic属和Pachymerus Thunberg属)。所有由此产生的树木都支持Ctenocolum属的单系性。该属有三种突触形态:(i)头部,基部额隆突增大,(ii)雄性侏儒体顶部截短,(iii)被盖侧叶,背突。在简约分析中,这两个已知的物种群也被恢复为单系。描述了以下三个物种:Ctenocolum inmaculatus Manfio&Ribeiro Costa sp.nov.(模式产地:委内瑞拉,Guarico),属于结核菌群;Ctenocolum nigrontos Manfio&Ribeiro Costa sp.nov.(类型地点:波多黎各,Mayaguez)和C.pallidus Manfio和Ribeiroo Costa sp.nov.(模式地点:圭亚那共和国),属于足农业群。最后,我们展示了这三个新物种和C.biolleyi的背部图案和雄性生殖器的彩色插图,以及Ctenocolum属的更新密钥。
Phylogeny and evolution of the genus Ctenocolum Kingsolver & Whitehead (Coleoptera, Chrysomelidae, Bruchinae), with the description of three new species
The seed beetle genus Ctenocolum Kingsolver & Whitehead is peculiar because its preferred host Lonchocharpus Kunth (Fabaceae) is not preyed upon by other bruchine species. This study investigates the phylogenetic relationships and evolution of this genus and of its species groups, while providing the description of three new species and of the male of C. biolleyi Kingsolver & Whitehead. To infer phylogenetic relationships, a character matrix of 40 morphological characters was assembled and analysed using both parsimony and Bayesian inference. Ancestral state estimations of host plant use and biogeography analyses were also performed. A total of 22 species were examined: 16 Ctenocolum species (including the three new ones) and six outgroup bruchine species (from genera Caryedes Hummel, Meibomeus Bridwell, Pygiopachymerus Pic and Pachymerus Thunberg). All resulting trees support the monophyly of the genus Ctenocolum. Three synapomorphies characterize the genus: (i) head with frontal carina enlarged at base, (ii) male pygidium truncated apically, and (iii) lateral lobes of tegmen with dorsal process. The two known species groups are also recovered monophyletic in the parsimony analyses. The following three species are described: Ctenocolum inmaculatus Manfio & Ribeiro-Costa sp. nov. (Type locality: Venezuela, Guarico), which belongs to the group tuberculatum; Ctenocolum nigronotus Manfio & Ribeiro-Costa sp. nov. (Type locality: Porto Rico, Mayaguez) and C. pallidus Manfio & Ribeiro-Costa sp. nov. (Type locality: Republic of Guyana), which belong to the group podagricus. Finally, we present colored illustrations of dorsal patterns and male genitalia for these three new species and C. biolleyi in addition to an updated key for the genus Ctenocolum.
期刊介绍:
Insect Systematics & Evolution (ISE) publishes original papers on all aspects of systematic entomology and the evolutionary history of both extant and extinct insects and related groups. Priority is given to taxonomic revisions and phylogenetic studies employing morphological and molecular data. ISE also welcomes reviews and syntheses that can appeal to a wide community of systematic entomologists. Single species descriptions, regional checklists, and phylogenetic studies based on few taxa or single molecular markers will generally not be accepted.