Morphological and molecular evidence for a new rhabdochonid species, Rhabdochona (Nematoda: Rhabdochonidae), parasitizing Eugerres mexicanus (Perciformes: Gerreidae), from the Lacantún River in the Biosphere Reserve of Montes Azules, Chiapas, Mexico

Autores/as

  • Juan Manuel Caspeta-Mandujano Universidad Autónoma del Estado de Morelos http://orcid.org/0000-0001-7125-4778
  • Julio César Salinas-Ocampo Universidad Autónoma del Estado de Morelos, Centro de Investigaciones en Biodiversidad y Conservación
  • Ramón Suárez-Rodríguez Universidad Autónoma del Estado de Morelos
  • Carlos Ramírez-Martínez Universidad Autónoma de Nuevo León
  • Wilfredo A. Matamoros Universidad Autónoma de Chiapas

DOI:

https://doi.org/10.22201/ib.20078706e.2021.92.3266

Palabras clave:

Parasitic nematode, Freshwater fish, Eugerres mexicanus, Lacantún River, Mexico

Resumen

A new nematode species, Rhabdochona juliacarabiasae sp. n. is described from specimens recovered from the intestine of the freshwater Mexican mojarra, Eugerres mexicanus (Steindachner) (Gerreidae) captured in the Lacantún River, Chiapas, Mexico. Rhabdochona juliacarabiasae sp. n. is characterized by possessing a prostom armed with 12 anterior teeth (excepcionally 11), small bifurcated deirids with a markedly long base, an unusual tetrafurcate tip of  the larger (left) spicule, a smaller (right) spicule without dorsal barb on its distal tip, and eggs with 1 short filament on each pole. In addition, in order to assess the phylogenetic relationships of the new species, and further demonstrate its distinctiveness against close related congeners, specimens of R. juliacarabiasae sp. n, R. xiphophori, R. salgadoi, R. kidderi, R. canadensis, and R. mexicana were sequenced for the cox1 gene, and the sequences were aligned with other nematode sequences available in GenBank (R. adentata, R. ahuhuellensis, R. ictaluri, and R. osorioi). Maximum likelihood and Bayesian inference analyses indicated that this new nested in a well-supported clade with high posterior probability. The molecular analyses support the validity of the new species. R. juliacarabiasae sp. n. was recovered as sister to the clade formed by R. kidderi and R. ictaluri, and shows genetic divergence that range between 11.18 and 14.89% (P- distances) compared with other congeners.

Biografía del autor/a

Juan Manuel Caspeta-Mandujano, Universidad Autónoma del Estado de Morelos

Profesor Investigador

Julio César Salinas-Ocampo, Universidad Autónoma del Estado de Morelos, Centro de Investigaciones en Biodiversidad y Conservación

Estudiante de Maestría

Ramón Suárez-Rodríguez, Universidad Autónoma del Estado de Morelos

Profesor Investigador

Carlos Ramírez-Martínez, Universidad Autónoma de Nuevo León

Profesor Investigador

Wilfredo A. Matamoros, Universidad Autónoma de Chiapas

Profesor Investigador

Citas

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Publicado

2021-02-24

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TAXONOMÍA Y SISTEMÁTICA