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首页> 外文期刊>Zoological Journal of the Linnean Society >Systematic revision of the Antarctic gastropod family Newnesiidae (Heterobranchia: Cephalaspidea) with the description of a new genus and a new abyssal species
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Systematic revision of the Antarctic gastropod family Newnesiidae (Heterobranchia: Cephalaspidea) with the description of a new genus and a new abyssal species

机译：系统修订南极胃肠道纽尼西亚（Hotefobranchia：Cephalashidea），具有新的属和新的深度物种的描述

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摘要

Antarctica has been hypothesized as a centre of origin of major heterobranch gastropod radiations, like Cephalaspidea and Nudipleura. Yet the study of Antarctic heterobranch diversity has been largely hampered by a lack of detailed morphological and anatomical studies, as well as comparative molecular phylogenetic approaches. Recently, the new cephalaspidean Newnesiidae was proposed to include two Antarctic endemic species. In this study, we review the diversity and relationships of the family using an expanded taxon sampling with broader geographical coverage, including the Atlantic and Pacific sides of Antarctica. An integrative taxonomic approach combining both morphological and molecular phylogenetics is used here. The diet of these molluscs is studied by gut content using scanning electron microscopy. A new species from abyssal depths is described, namely Newnesia abyssalis sp. nov., and the new genus Hocius gen. nov. is erected to reflect the phylogeny and the unique traits of the species Hocius joani comb. nov. The type species N antarctica is redescribed based on specimens from off Adelie Land close to the type locality (Ross Sea). The diet results were not entirely conclusive but suggest diatoms to be the predominant food source. This would support the hypothesis that herbivory is the plesiomorphic feeding condition in Cephalaspidea.
机译：南极洲已被假设作为主要的异常胃肠辐射的辐射的起源中心，如Cephalaspidea和Nudipleura。然而，缺乏详细的形态学和解剖学研究以及比较分子系统发育方法，对南极异常多样性的研究基本受到阻碍。最近，建议新的CephalaSpidean纽尼西亚人包括两种南极物种。在这项研究中，我们通过扩展的分类额采样，以更广泛的地域覆盖，包括更广泛的地理覆盖，包括南极洲的大西洋和太平洋侧面，审查家庭的多样性和关系。这里使用了组合形态学和分子系统的综合分类方法。通过扫描电子显微镜通过肠道含量研究这些软体动物的饮食。描述了来自深度深度的新物种，即纽尼西亚Abyssalis SP。 11月。和新的Hocius Gen属。 11月。被竖立以反映物种Hocius Joani Chame的系统发生和独特的特征。 11月。类型N南极洲南极洲是根据靠近型局部地区（罗斯海）的Adelie Land的标本重新筛分。饮食结果并不完全确定，但建议硅藻是主要的食物来源。这将支持草脂植物是Cephalaspidea中的plesomorphic饲养条件的假设。

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