PDF(Pubmed)
Abstract：
Geographical distribution plays a major role in our understanding of marine biodiversity. Some marine fish trematodes have been shown to have highly restricted geographical distributions, while some are known to occur over very wide ranges; however, very few of these wide distributions have been demonstrated genetically. Here, we analyse species of the genus Schikhobalotrema (Haplosplanchnidae) parasitizing beloniforms from the tropical west Pacific, the eastern Pacific and the Gulf of Mexico (GoM). We test the boundaries of these trematodes by integrating molecular and morphological data, host association, habitat of the hosts and geographical distribution, following a recently proposed and standardized delineation method for the recognition of marine trematode species. Based on the new collections, Schikhobalotrema huffmani is here synonymized with the type-species of the genus, Schikhobalotrema acutum; Sch. acutum is now considered to be widely distributed, from the GoM to the western Pacific. Additionally, we describe a new species, Schikhobalotrema minutum n. sp., from Strongylura notata and Strongylura marina (Belonidae) from La Carbonera coastal lagoon, northern Yucatán, GoM. We briefly discuss the role of host association and historical biogeography of the hosts as drivers of species diversification of Schikhobalotrema infecting beloniforms.
摘要：
地理分布在我们对海洋生物多样性的理解中起着重要作用。一些海洋鱼类吸虫已被证明具有高度受限的地理分布，虽然有些已知发生在很宽的范围内；然而，这些广泛的分布很少被基因证明。这里,我们分析了寄生于热带西太平洋白龙的Schikhobalotrema属（Haplosplanchnidae）的物种，东太平洋和墨西哥湾（GoM）。我们通过整合分子和形态数据来测试这些吸虫的边界，主机协会,寄主的栖息地和地理分布，遵循最近提出的用于识别海洋吸虫物种的标准化划定方法。基于新的收藏，SchikhobalotremaHuffmani在这里与该属的类型物种同义，Schikhobalotremaacutum；Sch。acutum现在被认为分布广泛，从GoM到西太平洋.此外,我们描述了一个新物种，Schikhobalotremaminutumn.sp.,来自Strongyluranotata和来自LaCarbonera沿海泻湖的Strongylura码头（Belonidae），尤卡坦北部，GoM.我们简要讨论了宿主关联和宿主的历史生物地理学作为Schikhobalotrema物种多样化的驱动因素的作用。
