A new species of Heterocotyle (Monogenea: Monocotylidae), a gill parasite of the diamond stingray Hypanus dipterurus (Myliobatiformes: Dasyatidae) from the Peruvian coastal zone

Abstract

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.

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Acknowledgements

To Marcelo Knoff (CHIOC) for allowing us access to specimens under his care. We also thank Leslie A. Chisholm (South Australian Museum, Australia), Masato Nitta (Kobe University, Japan) and Luis García-Prieto (Colección Nacional de Helmintos, Mexico) for providing us with valuable literature on monocotylids. The authors are grateful to the following people who helped to the collection of fishes in Peru: Ivette Cuellar, Eva G. Huancachoque, Alexander Reyes, Milagros Carrillo and Cynthia E. Rodríguez, all from the National University Federico Villarreal (UNFV). José L. Luque and Cláudia Portes Santos were supported by a Researcher fellowship from the Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brazil (CNPq). Jhon D. Chero and Celso L. Cruces were supported by a student fellowship from the Coordenação de Aperfeiçoamento de Pessoal do Ensino Superior, Brazil (CAPES)—Finance Code 001.

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Correspondence to José L. Luque.

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Chero, J.D., Cruces, C.L., Sáez, G. et al. A new species of Heterocotyle (Monogenea: Monocotylidae), a gill parasite of the diamond stingray Hypanus dipterurus (Myliobatiformes: Dasyatidae) from the Peruvian coastal zone. Acta Parasit. 65, 474–481 (2020). https://doi.org/10.2478/s11686-020-00183-5

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Keywords

  • Monogenea
  • Elasmobranch
  • Taxonomy
  • Marine fish
  • Peru