A new species of Clinostomum Leidy, 1856 based on molecular and morphological analysis of metacercariae from African siluriform fishes
A new species of Clinostomum Leidy, 1856 based on molecular and morphological analysis of metacercariae from African siluriform fishes
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DOI：
10.1007/s00436-019-06586-2
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发表时间：
2020-01-04
影响因子：
2
通讯作者：
Fioravanti, Maria L.
中科院分区：
文献类型：
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作者：
Caffara, Monica;Locke, Sean A.;Fioravanti, Maria L.
在非洲热带地区，斜口属由四个公认的和四个未命名的物种使用分子数据区分。在这里，我们描述了四个未命名的物种之一，作为斜口鱼ukolii n。sp.基于采集于尼日利亚和南非的鲶形鱼（Synodontis batensoda，Schilbe intermedius）的囊蚴。根据分子生物学数据（39个新的部分细胞色素c氧化酶I序列与其他物种的差异>= 6.7%）以及与同一地区已命名种和未命名种的形态差异来区分新种。C.乌科利;可以根据大小、体被棘和生殖复合体的各个方面（包括其位置、前睾丸的分叶以及卷囊的布置和形状）来区分。虽然新物种的描述通常是基于成年人的形态，我们认为，在数据可从区域已知的物种的囊蚴的情况下，新物种可以描述基于囊蚴，特别是当支持的分子数据，如这里。此外，亚成体生殖结构可以清楚地显示在后蚴的斜口吸虫。考虑到囊蚴作为新物种的潜在类型，可以更快地推进斜口系统学，因为囊蚴在鸟类最终宿主中比成虫更常见。
In the Afrotropic region, the genus Clinostomum is represented by four accepted and four unnamed species distinguished using molecular data. Here, we describe one of the four unnamed species as Clinostomum ukolii n. sp. based on metacercariae from siluriform fishes (Synodontis batensoda, Schilbe intermedius) collected in Nigeria and South Africa. The new species is distinguished by molecular data (39 new sequences of partial cytochrome c oxidase I >= 6.7% divergent from those of other species) and morphological differences from named and unnamed species in the same region. Metacercariae of C. ukolii n. sp. can be distinguished based on size, tegumental spines, and various aspects of the genital complex, including its position, lobation of the anterior testis, and the disposition and shape of the cirrus pouch. Although descriptions of new species of digeneans are typically based on the morphology of adults, we argue that in cases where data are available from metacercariae from regionally known species, new species can be described based on metacercariae, particularly when supported by molecular data, as here. Moreover, sub-adult reproductive structures can be clearly visualized in metacercaria of Clinostomum. Considering metacercariae as potential types for new species could advance clinostome systematics more rapidly, because metacercariae are encountered much more often than adults in avian definitive hosts.