Greenan Taylor M, Griffiths Charles L, Santamaria Carlos A
Biology Program, College of Science and Mathematics, University of South Florida Sarasota-Manatee, Sarasota, FL, United States of America.
Department of Biological Sciences and Marine Research Institute, University of Cape Town, Rondebosch, South Africa.
PeerJ. 2018 Apr 19;6:e4658. doi: 10.7717/peerj.4658. eCollection 2018.
Recent phylogeographic studies along the coastline of southern Africa have uncovered cryptic diversity in several coastal invertebrates, including direct developing crustaceans in the superorder Peracarida. These findings indicating the possible existence of additional cryptic diversity in other yet to be studied peracarids, particularly those known to harbor said cryptic diversity in other regions of the world. Isopods in the genus are one such taxon. They inhabit patchy rocky beaches, are direct developers, avoid the open water, and exhibit other biological traits that severely constrain their dispersal potential (e.g., poor desiccation resistance). These traits are thought to have led to long-term isolation of populations, and allopatric diversification in species around the world; however, species in southern Africa, where three endemic species of uncertain validity are known to exist, remain unstudied to date. In this study, we used mitochondrial and nuclear markers to characterize collected in 18 localities from Namibia to the KwaZulu-Natal region of South Africa. We report the presence of cryptic lineages within species in the region that suggest the need for taxonomic reevaluation of these isopod species.
最近在非洲南部海岸线开展的系统发育地理学研究发现，包括超目Peracarida中的直接发育甲壳类动物在内的几种沿海无脊椎动物存在隐秘多样性。这些发现表明，在其他尚未研究的Peracarida物种中可能存在更多的隐秘多样性，特别是那些在世界其他地区已知存在这种隐秘多样性的物种。属的等足类动物就是这样一个分类群。它们栖息在零散的岩石海滩上，是直接发育的动物，避开开阔水域，并表现出其他严重限制其扩散潜力的生物学特征（例如，抗干燥能力差）。这些特征被认为导致了种群的长期隔离，以及世界各地物种的异域多样化；然而，在非洲南部，已知存在三种有效性不确定的特有物种，至今仍未对其进行研究。在本研究中，我们使用线粒体和核标记对从纳米比亚到南非夸祖鲁 - 纳塔尔地区18个地点采集的进行了特征描述。我们报告了该地区物种中存在隐秘谱系，这表明需要对这些等足类物种进行分类学重新评估。
