Rosser Thomas G, Alberson Neely R, Woodyard Ethan T, Cunningham Fred L, Pote Linda M, Griffin Matt J
Department of Basic Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS, 39762, USA.
Mississippi Field Station, National Wildlife Research Center, Wildlife Services, United States Department of Agriculture, Mississippi State, MS, 39762, USA.
Syst Parasitol. 2017 Jan;94(1):35-49. doi: 10.1007/s11230-016-9686-0. Epub 2017 Jan 6.
Members of the genus Clinostomum Leidy, 1856, colloquially known as yellow grubs, are cosmopolitan parasites of piscivorous birds, freshwater snails, fish and amphibians. In the southeastern United States, piscivorous birds present a continuous challenge for producers of farm-raised catfish. Ciconiiform birds are common hosts of Clinostomum spp. in North America and are endemic on most commercial catfish operations. The great egret Ardea alba L. is an avian predator often found foraging on commercial catfish operations, but to date the trematode fauna of great egrets preying on catfish ponds remains mostly understudied. Thirteen great egrets were captured from commercial catfish ponds in northeast Mississippi, and examined for trematode infections. Two morphologically distinct Clinostomum spp. were observed in the great egrets sampled, one morphologically consistent with Clinostomum marginatum (Rudolphi, 1819) and one morphologically unique species. These morphological descriptions were supplemented with molecular sequence data (c.4,800 bp of ribosomal DNA and c.600 bp of mitochondrial DNA). Gene sequences confirmed the identification of C. marginatum. However, the second species differed significantly from its congeners in both morphology and DNA sequence. Given these distinct morphological and molecular characters we propose this second species as Clinostomum album n. sp.
1856年命名的Clinostomum属成员，俗称黄蛆，是食鱼鸟类、淡水蜗牛、鱼类和两栖动物的世界性寄生虫。在美国东南部，食鱼鸟类给养殖鲶鱼的养殖户带来持续挑战。鹳形目鸟类是北美Clinostomum属物种的常见宿主，在大多数商业鲶鱼养殖场中均有发现。大白鹭（Ardea alba L.）是一种常在商业鲶鱼养殖场觅食的鸟类捕食者，但迄今为止，捕食鲶鱼塘的大白鹭体内的吸虫动物群大多仍未得到充分研究。从密西西比州东北部的商业鲶鱼塘捕获了13只大白鹭，并对其进行吸虫感染检查。在所采样的大白鹭中观察到两种形态不同的Clinostomum属物种，一种在形态上与边缘斜睾吸虫（Clinostomum marginatum，Rudolphi，1819）一致，另一种是形态独特的物种。这些形态学描述辅以分子序列数据（约4800 bp的核糖体DNA和约600 bp的线粒体DNA）。基因序列证实了边缘斜睾吸虫的鉴定。然而，第二个物种在形态和DNA序列上均与其同属物种有显著差异。鉴于这些明显的形态和分子特征，我们将第二个物种命名为白斜睾吸虫（Clinostomum album n. sp.）。
