A new species of the genus Paradistomum (Platyhelminthes: Trematoda) from Iwasaki's snail-eating snake Pareas iwasakii, with a note on morphological variations of Paradistomum megareceptaculum (Tamura, 1941).

IF 1 4区医学 Q4 PARASITOLOGY Systematic Parasitology Pub Date : 2024-05-13 DOI:10.1007/s11230-024-10164-1

Tsukasa Waki, Masaki Hoso, Masato Nitta, Harushige Seo, Misako Urabe

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Abstract

Dicrocoeliid trematodes were detected from Iwasaki's snail-eating snake Pareas iwasakii in Iriomote Island, Okinawa Prefecture, Japan, and described as a new species Paradistomum dextra n. sp. in the present study. This new species can be distinguished from the type series of the other members of the genus based on size of eggs and morphological characteristics of body, oral and ventral suckers, and reproductive organs. However, the new species was hard to distinguish from Paradistomum megareceptaculum infecting snakes in Japan, including Iriomote Island where is the type locality of the new species, because it is closely similar to some part of the broad range of morphological variations in P. megareceptaculum. On the other hand, a partial sequence of 28S ribosomal DNA clearly distinguished these two species. Moreover, the new species' host snake Pareas iwasakii is reported to exclusively feed on land snails while host snakes of P. megareceptaculum feed on small vertebrates, indicating that the new species is also ecologically different from P. megareceptaculum. We also redescribed P. megareceptaculum based on adults sampled in this study and past studies to record the morphological variations of this species.

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岩崎食螺蛇 Pareas iwasakii 的 Paradistomum 属（扁形动物：吸虫纲）新种，以及 Paradistomum megareceptaculum（Tamura，1941 年）形态变异的说明。

本研究从日本冲绳县西表岛的岩崎食螺蛇 Pareas iwasakii 中检测到了微囊吸虫，并将其描述为新种 Paradistomum dextra n. sp.。根据卵的大小以及身体、口腔和腹吸盘以及生殖器官的形态特征，可以将该新种与该属其他成员的模式系列区分开来。然而，由于该新种与西表岛（该新种的模式产地）等日本蛇类感染的 Paradistomum megareceptaculum 的部分形态变异非常相似，因此很难将其与这些蛇类区分开来。另一方面，28S 核糖体 DNA 的部分序列明确区分了这两个物种。此外，据报道，新种的宿主蛇 Pareas iwasakii 只以陆地蜗牛为食，而 P. megareceptaculum 的宿主蛇则以小型脊椎动物为食，这表明新种在生态学上也与 P. megareceptaculum 不同。我们还根据本研究和以往研究中的成体样本对 P. megareceptaculum 进行了重新描述，以记录该物种的形态变异。

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来源期刊

Systematic Parasitology 医学-寄生虫学

CiteScore

2.20

自引率

23.10%

发文量

审稿时长

6-12 weeks

期刊介绍： Systematic Parasitology publishes papers on the systematics, taxonomy and nomenclature of the following groups: Nematoda (including plant-parasitic), Monogenea, Digenea, Cestoda, Acanthocephala, Aspidogastrea, Cestodaria, Arthropoda (parasitic copepods, hymenopterans, mites, ticks, etc.), Protozoa (parasitic groups), and parasitic genera in other groups, such as Mollusca, Turbelleria, etc. Systematic Parasitology publishes fully illustrated research papers, brief communications, and fully illustrated major revisions. In order to maintain high standards, all contributors describing new taxa are asked to state clearly where the holotype is deposited and to make paratypes available for examination by the referees. It is recognized that, in some cases, this may cause problems for the authors, but it is hoped that by adhering to this rule authors may be protected against rapid synonymy of their taxa, and the types will be preserved for posterity.