US EPA

4958244 

Journal Article 

Taxonomic study of Hophas aimara (Valenciennes, 1846) and Hoplias macrophthalmus (Pellegrin, 1907) (Ostariophysi, Characiformes, Erythrinidae) 

Mattox, GMT; Toledo-Piza, M; Oyakawa, OT 

2006 

Yes 

Copeia
ISSN: 0045-8511
EISSN: 1938-5110 

3 

516-528 

WOS:000240652400019 

The taxonomy of the nominal species of giant trahiras Hoplias aimara (Valenciennes, 1846) and Hoplias macrophthalmus (Pellegrin, 1907), both described from Cayenne (French Guiana), was evaluated to determine whether they constitute distinct forms and to determine the geographic distribution of the recognized species. A total of 200 specimens were examined (30-624 mm standard length). Analysis of meristic and morphometric data resulted in the recognition of a single species. Study of the type-specimens revealed that both species names, H. aimara and H. macrophthalmus, refer to the same taxon. According to the Principle of Priority of the International Code of Zoological Nomenclature the name Hoplias aimara has precedence. This species is distinguished from congeners by the presence of a vertically-elongate dark spot on the median portion of the opercular membrane and by the absence of the accessory ectopterygoid. Hoplias aimara occurs in the drainages of Rio Tocantins, Rio Xingu, Rio Tapajos, Rio Jari, and Rio Trombetas, in coastal drainages of the Guyanas, Suriname, and state of Amapa, Brazil. In the Rio Orinoco basin, the species occurs only in the Rio Caroni and rivers to the east of this drainage. Literature records of Hoplias aimara for the Rio Purus and upper Rio Orinoco were based on misidentifications. This pattern of geographic distribution of Hoplias aimara in rivers of the Guyanas and Brazilian Shields also occurs in other Neotropical species of fishes.