Tuesday, July 28, 2020

[Ichthyology • 2020] Catoprion absconditus • Molecular Delimitation and Taxonomic Revision of the Wimple Piranha Catoprion (Characiformes: Serrasalmidae) with the Description of A New Species

 Catoprion absconditus 
Bonani Mateussi, Melo & Oliveira, 2020

Photo by Valéria Machado.

A taxonomic revision of wimple piranhas of the genus Catoprion is performed in combination with a molecular analysis using mtDNA. Molecular phylogenetic analyses of 49 specimens using genetic distances, conventional likelihood and four delimitation methods yielded two distinct lineages of Catoprion , with the morphological analyses of 198 specimens of Catoprion corroborating the molecular results. We provide a redescription of Catoprion mento, from the Paraguay, Orinoco, and tributaries of western Amazon basin, keeping Mylesinus macropterus as a junior synonym of C. mento, and the description of Catoprion absconditus n. sp., from the Amazon and Essequibo basins. C. absconditus n. sp. differs from C. mento by the presence of 86–94 perforated scales in the lateral line (vs. 65–86 scales) and the presence of 35–40 circumpeduncular scales (vs. 29–34 scales). The distribution of C. mento follows the Amazonas‐Paraguay‐Orinoco lowlands, whereas C. absconditus follows the eastern Amazon biogeographic pattern.

Keywords: biodiversity, DNA barcoding, Neotropical region, systematics, Teleostei

Catoprion Müller & Troschel, 1844

Etymology: Cato, from the ancient Greek kata, meaning downprion, from the Greek prion, meaning saw; probably referring to the ventral keel with spines.

Catoprion mento (Cuvier, 1819)

FIGURE 12: Catoprion absconditus, INPA 37246, 121 mm L S, live coloration, rio Jatapu, Amazonas.
Photo by Valéria Machado. 

Catoprion absconditus Mateussi, Melo & Oliveira sp. nov.

Etymology: The epithet absconditus is from the Latin meaning “hidden.” C. absconditus has been identified as C. mento in the Amazon basin for 201 years, since its original description (Cuvier, 1819).

Nadayca T. Bonani Mateussi, Bruno F. Melo and Claudio Oliveira. 2020. Molecular Delimitation and Taxonomic Revision of the Wimple Piranha Catoprion (Characiformes: Serrasalmidae) with the Description of A New Species. Journal of Fish Biology. DOI: 10.1111/jfb.14417