Introduction

A new monogenean, Heterocotyle margaritae n. sp. (Monocotylidae: Heterocotylinae), is described based on specimens collected from the gills of the diamond stingray, Hypanus dipterurus (Jordan & Gilbert, 1880) (Myliobatiformes: Dasyatidae) captured off the South Pacific coast, Lima Region, Peru.

Materials and methods

Monogeneans were fixed in hot 4% formalin, observed and measured as permanent mounts stained with Gomori’s trichrome, and mounted in Canada balsam. Drawings were made with the aid of a drawing tube.

Results

The new species is distinguished from all congeners mainly by having a funnel-shaped male copulatory organ, spatulate distally with lateral folds and by its club-shaped accessory piece. The most similar congener, H. americana Hargis, 1955, resemble H. margaritae n. sp. regarding the general structure of the male copulatory organ (funnel-shaped with an accessory piece). However, besides other features, the new species differ from H. americana by having an accessory piece without a dorsal button (vs an accessory piece with a dorsal button in H. americana).

Conclusions

This is the first report of a member of Heterocotyle Scott, 1904 in the Southeastern Pacific Ocean. The present finding brings to 20 the number of known species of Heterocotyle, and represents the fifth described monogenean species from Hypanus dipterurus.

中文翻译：

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来自秘鲁沿海地区的一种新的杂种亚种（Monogenea：Monocotylidae），是一种金刚鹦鹉Hypanus dipterurus（Myliobatiformes：Dasyatidae）的g寄生虫。

介绍

一种新的单种，杂种玛格丽塔酒。sp。（Monocotylidae：Heterocotylinae）是根据从钻石黄貂Hy（Hypanus dipterurus（Jordan＆Gilbert，1880）（Myliobatiformes：Dasyatidae）的captured中收集的标本进行描述的，这些标本是从秘鲁利马地区的南太平洋海岸捕获的。

材料和方法

将单基因菌固定在热的4％福尔马林中，观察并测量为用Gomori's trichrome染色的永久坐骑，并坐于加拿大香脂中。借助拉管进行绘制。

结果

新物种与所有同类动物的区别主要在于其具有漏斗形的雄性交配器官，其末端具侧向褶皱，并具棍状附件。最相似的同类，^ h。美国的哈吉斯（1955）与H相似。藤ñ。sp。关于男性交配器官的总体结构（漏斗形，带有附件）。然而，除了其他功能方面，新种不同^ h。美洲由具有无背按钮附件片（与附件片与背侧按钮ħ。美洲）。

结论

这是东南太平洋的1904年异变叶猴Scott成员的首次报道。本发现带来至20的已知物种的数量Heterocotyle，并且表示从第五描述monogenean物种Hypanus dipterurus。