Friday, October 29, 2021

[Ichthyology • 2021] Cetopsorhamdia hidalgoi • A New Species of Cetopsorhamdia (Siluriformes: Heptapteridae) from the Upper Amazon River Basin


Cetopsorhamdia hidalgoi
Faustino-Fuster & de Souza, 2021

A new species of Cetopsorhamdia is described from material collected on rapid inventories and ichthyological expeditions in the Amazon region of Peru, Ecuador and Colombia. The new species can be differentiated from all other species of Cetopsorhamdia by the colouration pattern on fins, number of vertebrae, number of ribs, level insertion of dorsal fin, number of rays on dorsal and pectoral fin, osteological characters and several other morphometric characters. The new species is distributed along tributaries of the upper Amazon River basin in Peru, Colombia and Ecuador.

Keywords: fresh water, Neotropical, taxonomy, three-barbel catfish

Cetopsorhamdia hidalgoi. MUSM 69550, holotype, 30.7 mm LS, Peru, Loreto, Requena, Tapiche River tributary to Ucayali River basin.
 (a) Lateral view, (b) dorsal view and (c) ventral view. Black arrow indicates the urogenital papillae.
Scale bar = 1 cm

Cetopsorhamdia hidalgoi new species

Etymology: Named in honour of the authors’ colleague and friend Max Hidalgo, professor, and curator of the Ichthyology Department at the Museo de Historia Natural in the Universidad Nacional Mayor de San Marcos (MUSM) for his devotion and dedication to Peru Ichthyology. Hidalgo collected the holotype, in addition to many specimens of the type series on expeditions including several rapid inventories in Peru that have led to the creation of multiple conservation areas.

 Geographic distribution: C. hidalgoi is known from the Ucayali, Marañón, Napo and Orteguaza rivers tributaries of the Upper Amazon River in Peru, Ecuador and Colombia and from the Madre de Dios River tributary of the Madeira River basin in Peru (Figure 6).

 Ecology: Found in clearwater streams with modest flow, substrate often with submerged leaves and sand.

Dario R. Faustino-Fuster and Lesley S. de Souza. 2021. A New  Species of Cetopsorhamdia (Siluriformes: Heptapteridae) from the Upper Amazon River basin. Journal of Fish Biology. DOI: 10.1111/jfb.14914