Velásquez-Rodriguez Karen, Reyes Jhoe, Steenkiste Niels VAN, Severino Ruperto, Brusa Francisco
Facultad de Ciencias de la Vida y de la Salud; Universidad Científica del Sur; Lima; Perú..
Departments of Botany and Zoology; University of British Columbia; University Blvd; 3156-6270.
Zootaxa. 2023 Mar 31;5258(5):501-523. doi: 10.11646/zootaxa.5258.5.1.
The marine microturbellarian diversity is scarcely known from the Pacific coastline of South America. The coastal margin of Peru is highly influenced by cold-water currents (Humboldt Current System). These cold-water currents play important roles in shaping the marine species diversity in this area. However, there are no previous records of marine microturbellarians for Peru. Here, we describe a new species of Rhabdocoela and report on five other species of marine microturbellarians for this country. Carcharodorhynchus giaae n. sp. (Kalyptorhynchia, Schizorhynchidae), can be identified based on the configuration of the proboscis lips and the male and female genital systems. The male copulatory organ lacks a cirrus, but has a funnel-like, curved stylet with three pairs of spines along it, which distinguishes this species from its congeners. The female system has a vagina with a sclerotized, heavily coiled structure - a feature not mentioned in any known species of the same genus. In addition, we describe noteworthy features for another rhabdocoel, Trigonostomum galapagoense (Dalytyphloplanida, Trigonostomidae). Finally, we provide new records for three rhabdocoel species (Alcha evelinae, Itaipusa divae, Utelga heinckei), one species of Fecampiida (Urastoma cyprinae), and an unidentified species of Prolecithophora.
南美洲太平洋沿岸的海洋微涡虫多样性鲜为人知。秘鲁的沿海边缘受到冷水流（洪堡洋流系统）的强烈影响。这些冷水流在塑造该地区的海洋物种多样性方面发挥着重要作用。然而，此前秘鲁没有海洋微涡虫的记录。在此，我们描述了一种新的吻腔目涡虫，并报告了该国的其他五种海洋微涡虫。新种卡氏吻腔涡虫（Carcharodorhynchus giaae n. sp.，隶属于有鞘吻腔目、裂吻科）可根据吻唇以及雌雄生殖系统的结构来识别。雄性交配器官没有阴茎，但有一个漏斗状的弯曲小针，上面有三对刺，这使其与同属其他物种区分开来。雌性系统有一个阴道，其结构硬化且高度盘绕，这一特征在该属的任何已知物种中均未提及。此外，我们描述了另一种吻腔目涡虫——加拉帕戈斯三角口涡虫（Trigonostomum galapagoense，隶属于盘涡目、三角口科）的显著特征。最后，我们提供了三种吻腔目涡虫（埃氏阿尔查涡虫Alcha evelinae、迪氏伊塔普萨涡虫Itaipusa divae、海氏乌特尔加涡虫Utelga heinckei）、一种费坎目涡虫（塞浦路斯尾口涡虫Urastoma cyprinae）以及一种未鉴定的前黄卵涡虫的新记录。
