A New Species of Trichomycterus (Siluriformes: Trichomycteridae) from Madidi National Park, Amazon Basin, Bolivia

MIRANDA, GUIDO; FERNÁNDEZ, LUIS

COPEIA

AMER SOC ICHTHYOLOGISTS HERPETOLOGISTS

Año: 2020 vol. 108 p. 459 - 467

0045-8511

Trichomycterus lauzannii, new species, is described from the upper R´ıo Beni basin in La Paz, Bolivia. The new species is distinguished from congeners by the posterior cranial fontanel reduced to a small round opening on the posterior portion of supraoccipital bone and the possession of a rounded anterior cranial fontanel between frontal bones. In addition, the new species can be further distinguished from congeners by the possession of seven or fewer odontodes in the opercular patch, a pelvic fin which does not reach the anus when depressed, round blotches along the side of body, afirst pectoral-fin ray prolonged as a short distal filament, and several meristic and morphometric features. Comparisons are given with similar congeners (T. cachiraensis, T. megantoni, T. sketi, and T. steindachneri).