Phylogenetic position of the deep-sea snail family Haloceratidae and new insights into caenogastropod relationships
Phylogenetic position of the deep-sea snail family Haloceratidae and new insights into caenogastropod relationships
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深海蜗牛科Haloceratidae的系统发育地位和对蚓足动物关系的新见解
DOI：
10.1093/mollus/eyac012
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发表时间：
2022
影响因子：
1.2
通讯作者：
Kano Yasunori
中科院分区：
文献类型：
--
作者：
Takano Tsuyoshi;Waren Anders;Kano Yasunori
Haloceratidae 是 Caenogastropoda 亚纲中一个鲜为人知的科，由于其在全世界深海水域（深度约 800-3,500 米）中极为罕见，因此其系统发育地位受到争议。 Haloceratids 与 Vanikoroidea、Tonnoidea、Capuloidea 和 Velutinoidea 的成员有一些共同的形态和生态特征，由于后三个类群缺乏某些非同形特征，因此暂时归入 Vanikoroidea。在这里，我们首先根据两个已识别属（Haloceras 和 Zygoceras）的分子数据研究该家族的系统发育位置。基于三个核和三个线粒体基因序列的重建表明，Haloceratidae 构成 Capulidae 的姐妹分支，并且这两个科共同形成 Capuloidea 超科。这个总科与Calyptraeoidea、Velutinoidea、Tonnoidea和Neogastropoda组成一个庞大而强大的分支。正如之前所设想的，Cypraeoidea 总科被发现是多系的。我们提出了Cypraeoidea（包括Cypraeidae和Ovulidae）和Velutinoidea（包括Velutinidae、Eratoidae和Triviidae）的新概念。这种拓扑结构还证实了类群的多系性，其中包括“棘螺体”类型的幼虫（棘螺体）。这些多系类群的形态相似性凸显了响应相同选择压力的性状的平行获得。
The phylogenetic position of Haloceratidae, a little-known family of the subclass Caenogastropoda, is contested due to its extreme rarity in bathyal waters worldwide (c.800–3,500 m deep). Haloceratids share several morphological and ecological traits with members of Vanikoroidea, Tonnoidea, Capuloidea and Velutinoidea, and were provisionally included in Vanikoroidea based on the absence of certain apomorphic features of the latter three taxa. Here, we first investigate the phylogenetic position of the family based on molecular data from both of the recognized genera,HalocerasandZygoceras. Reconstruction based on three nuclear and three mitochondrial gene sequences suggests that the Haloceratidae constitute a sister clade to the Capulidae and that the two families collectively form the superfamily Capuloidea. This superfamily is united in a large, robust clade with Calyptraeoidea, Velutinoidea, Tonnoidea and Neogastropoda. The superfamily Cypraeoidea, as previously conceived, was found to be polyphyletic; we propose new concepts of Cypraeoidea (including Cypraeidae and Ovulidae) and Velutinoidea (including Velutinidae, Eratoidae and Triviidae). This topology also confirms the polyphyly of taxa with the ‘echinospira’ type of larvae (Echinospirida). The morphological resemblance of these polyphyletic taxa highlights parallel acquisition of traits in response to the same selective pressures.