Pliocene freshwater isopods (Crustacea: Peracarida: Isopoda) from Jalisco, Mexico

Isópodos (Crustacea: Peracarida: Isopoda) de agua dulce del Plioceno de Jalisco, México

Leonardo García-Vázquez^1,*, Jesús Alvarado-Ortega², Francisco J. Vega^2,*

¹ Departamento de Zoología de Invertebrados, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, Av. Universidad s/n, Ciudad Universitaria, 66451 San Nicolás de los Garza, Nuevo León, Mexico.

² Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, 04510, CDMX, Mexico.

* Corresponding author: (F. J. Vega) This email address is being protected from spambots. You need JavaScript enabled to view it.

How to cite this article:

García-Vázquez, L., Alvarado-Ortega, Vega, F. J., 2023, Pliocene freshwater isopods (Crustacea: Peracarida: Isopoda) from Jalisco, Mexico: Boletín de la Sociedad Geológica Mexicana, 75 (1), A271122. http://dx.doi.org/10.18268/BSGM2023v75n1a271122

Manuscript received: September 20, 2022; Corrected manuscript received: November 20, 2022; Manuscript accepted: November 28, 2022.

ABSTRACT

A new genus and species of freshwater isopod is described from Pliocene volcanic sedimentary ashes found in an ancient lake basin in the Santa Rosa Dam region, Amatitlán, Jalisco, West-central Mexico. The new isopod is represented by a few corpses and molts. Due to the relatively poor preservation, no further morphological details can be offered to the moment, but the observed features are sufficient to distinguish this isopod from any living or fossil freshwater Sphaeromatidae species. This contribution extends the stratigraphic and geographic record of fossil isopod bearing localities in Mexico, being this the youngest fossil Peracarida recorded from this country.

Keywords: Sphaeromatidae, new genus and species, Pliocene, lacustrine volcanic ash deposits, mass mortality.