亚南极和南极近岸海洋底栖无脊椎动物的系统需要进行重大修订,并强调了在南大洋(SO)的标本识别图中纳入其他信息来源的必要性。在这项研究中,我们的目标是通过南极和亚南极分类群的分子和形态比较来提高我们对Kidderia(Dall1876)生物多样性的理解。Kidderia属的微生物瓣膜是小型育苗生物,栖息在潮间带和潮下浅层岩石生态系统中。该属代表了一个有趣的模型,可以测试SO生物地理学中的替代和扩散假设。然而,对Kidderia物种的描述依赖于一些形态特征和生物地理记录,这引起了人们对该群体真实多样性的质疑。在这里,我们将定义用遗传工具收集的标本,划定各自跨省的边界,验证两种Kidderia的存在。通过修订分类学问题和物种划界,据报道,南极物种是Kidderiasubquadrata,该物种记录在南极群岛迭戈·拉米雷斯,南乔治亚和克格伦群岛是基德里亚·米努塔。差异时间估计表明,Kidderia谱系的起源和多样化与历史上的替代过程有关,这可能与始新世晚期大陆陆块的分离有关。
■在线版本包含补充材料,可在10.1007/s00300-021-02885-6获得。
The systematics of Subantarctic and
Antarctic near-shore marine benthic invertebrates requires major revision and highlights the necessity to incorporate additional sources of information in the specimen identification chart in the Southern Ocean (SO). In this study, we aim to improve our understanding of the biodiversity of Kidderia (Dall 1876) through molecular and morphological comparisons of
Antarctic and Subantarctic taxa. The microbivalves of the genus Kidderia are small brooding organisms that inhabit intertidal and shallow subtidal rocky ecosystems. This genus represents an interesting model to test the vicariance and dispersal hypothesis in the biogeography of the SO. However, the description of Kidderia species relies on a few morphological characters and biogeographic records that raise questions about the true diversity in the group. Here we will define the specimens collected with genetic tools, delimiting their respective boundaries across provinces of the SO, validating the presence of two species of Kidderia. Through the revision of taxonomic issues and species delimitation, it was possible to report that the
Antarctic species is Kidderia subquadrata and the species recorded in the Subantarctic islands Diego Ramirez, South Georgia and the Kerguelen Archipelago is Kidderia minuta. The divergence time estimation suggests the origin and diversification of Kidderia lineages are related to historical vicariant processes probably associated with the separation of the continental landmasses close to the late Eocene.
UNASSIGNED: The online version contains supplementary material available at 10.1007/s00300-021-02885-6.