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首页> 外文期刊>Journal of Molluscan Studies >Mapping the missing branch on the neogastropod tree of life: molecular phylogeny of marginelliform gastropods
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Mapping the missing branch on the neogastropod tree of life: molecular phylogeny of marginelliform gastropods

机译：在Neogastropod生命之树上映射丢失的分支：Marginelliform Gastropods的分子系统

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Marginelliform gastropods are a heterogeneous and diverse group of molluscs encompassing over 1,600 living species, among which are the smallest known neogastropods. The relationships of marginelliform gastropods within the order Neogastropoda are controversial, and the monophyly of the two marginelliform families the Marginellidae(J. Fleming, 1828 and the Cystiscidae Stimpson, 1865, remains unconfirmed. DNA sequence data have never been used to assess the relationships of the marginelliform gastropods, making this group the only major branch missing in our current understanding of the neogastropod tree of life. Here we report results of the first multilocus phylogenetic analysis of marginelliform gastropods, which is based on a dataset comprising 63 species (20 genera) of Marginellidae and Cystiscidae, and a wide range of neogastropod lineages. The Marginellidae and Cystiscidae form a moderately supported Glade that is sister to the family Volutidae. Marginellona gigas appears to be sister to all other marginelliforms. The subfamily Marginellinae was recovered as a well-supported Glade, and good resolution of this part of the tree makes it possible to propose amendments to the family-level classification of the group. The relationship between Granulina and other marginelliforms could not be resolved and requires further study. Due to poor resolution of basal relationships within the Marginellidae Cystiscidae Glade, the monophyly of the Cystiscidae was neither confirmed nor convincingly rejected. The shell morphology of most marginellid and cystiscid genera is taxonomically not very informative but, nevertheless, of the traditionally recognized genera only Gibberula and Dentimargo were shown to be polyphyletic. Although a comprehensive systematic revision of the group requires more extensive taxonomic sampling (e.g. with better representation of the type species of nominal genus -group names), our results support the superfamily Volutoidea, comprising four families (Volutidae, Cystiscidae, Marginellidae and Marginellonidae), with the placement of the Granulinidae uncertain for the time being.
机译：Marginelliform Gastropods是一种异质和多样的软体动物，包括超过1,600个生活物种，其中是最小的已知Neogastropods。 Neogastropoda秩序内的Marginelliform Gastropods的关系是争议的，并且两种Marginelliform家族的单层植物（J. Fleming，1828和Cysticalidae Stimpson，1865年仍然是未经证实的。DNA序列数据从未用于评估关系Marginelliform Gastropods，使这一组成为我们目前对Neogastropod生命之树的理解中唯一缺少的主要分支。这里我们报告了Marginelliform Gastropods的第一个多层系统发育分析的结果，其基于包含63种（20属）的数据集（20属） Marginellidae和Cysticalidae，以及各种各样的Neogastropod谱系。Marginellidae和Cysticalidae形成一个适度支持的林位，这是家庭卷的妹妹。Marginellona Gigas似乎是所有其他Marginelliforms的姐妹。亚家族Marginellinae被回收 - 支持的沼泽，并且这部分树的良好分辨率使它成为可能e提出了对本集团家庭级别分类的修正案。 Granulina和其他Marginelliforms之间的关系无法解决，需要进一步研究。由于Marginellidae Cysticididae Glade内的基础关系的分辨率差，囊肿的单层既不证实也不令人信服地拒绝。大多数Marginellid和Cysticalid属的壳体形态是分类学上的不是非常富有信息的，但是，传统公认的属于吉布拉和Dentimargo被证明是多肽。虽然本集团的全面系统修订需要更广泛的分类水分类抽样（例如，具有更好的名称属型姓名型物种的名称，但我们的结果支持超家族volutoidea，包含四个家庭（volutidae，Cysticalidae，Marginellidae和Marginellidae），随着甘氨酸的放置不确定。

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