A new species of Rhinoxenoides (Dactylogyridae) parasitizing Triportheus Angulatus (Spix & Agassiz, 1829) (Characiformes) from the Juruá river basin, Brazil

Authors

  • Simone Chinicz Cohen Laboratório de Helmintos Parasitos de Peixes, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz – Fiocruz, Avenida Brasil, 4365, Rio de Janeiro, RJ 21040‑900, Brasil. https://orcid.org/0000-0001-8204-336X
  • Williane Maria de Oliveira Martins Laboratório de Biologia Geral do Instituto Federal de Acre (IFAC), Campus Cruzeiro do Sul, Estrada da Apadec nº1192, Bairro Nova Olinda, CEP: 69980‑000, Cruzeiro do Sul, Acre, Brazil. https://orcid.org/0000-0002-0684-3389
  • Marcia Cristina Nascimento Justo Laboratório de Helmintos Parasitos de Peixes, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz – Fiocruz, Avenida Brasil, 4365, Rio de Janeiro, RJ 21040‑900, Brasil. https://orcid.org/0000-0003-2078-7587

DOI:

https://doi.org/10.62429/rnh20251911914

Keywords:

Dactylogyridae , Neotropical region, Parasites of fishes , Rhinoxenoides, South America, Triportheidae

Abstract

A new species of Rhinoxenoides was described parasitizing the gill filaments of neotropical triportheid fishes. The new species was described from Triportheus angulatus (Spix & Agassiz, 1829) from the Juruá River, State of Acre, Brazil. Rhinoxenoides cruzeirensis n. sp. resembles Rhinoxenoides horacioschneideri Santos Neto, Costa, Soares & Domingues, 2018, mainly by presenting a coiled male copulatory organ (MCO) with clockwise rings; accessory piece with articulation process extending within the coils to the base of MCO; dorsal anchor with well-developed superficial root, and dorsal bar absent. However, it differs from this by number of the coils of the MCO; accessory piece formed by a straight piece that expands in the middle, where it folds over itself; ventral bar short and robust; dorsal anchor with a well-developed superficial root twice as long as the deep root, with a small wing-shaped extension in the distal portion.

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Published

2025-04-10

How to Cite

Chinicz Cohen, S., de Oliveira Martins, W. M., & Nascimento Justo, M. C. (2025). A new species of Rhinoxenoides (Dactylogyridae) parasitizing Triportheus Angulatus (Spix & Agassiz, 1829) (Characiformes) from the Juruá river basin, Brazil. Neotropical Helminthology, 19(1). https://doi.org/10.62429/rnh20251911914