A new catfsh species of the genus Trichomycterus (Siluriformes: Trichomycteridae) from the río Orinoco versant of Páramo de Cruz Verde, Eastern Cordillera of Colombia [Trichomycterus steindachneri]

  • Carlos DoNascimiento , Saúl Prada-Pedreros and Jürgen Guerrero-Kommritz

    Abstract

    Zitat

    A new Trichomycterus is described from a highland tributary of the río Meta (Orinoco basin), along the east fank of Páramo de Cruz Verde, Eastern Cordillera of Colombia. The new species is distinguished from most of its congeners by having a reduced posterior cranial fontanel, restricted to the parieto-supraoccipital, cleithrum pierced by several foramina, and an unique combination of four irregular rows of conic teeth in premaxilla and dentary, 13-14 opercular odontodes, 41-43 interopercular odontodes, 6-7 branchiostegal rays, 40 or 41 free vertebrae, 14-18 ribs, frst ray of pectoral fn slightly projected as a short flament, 7-8 branched pectoral-fn rays, dorsal-fn origin at same level of pelvic-fn insertion, anal-fn origin posterior to dorsal-fn base, caudal-fn margin slightly rounded, a single upper hypural plate (3+4+5), and coloration pattern consisting in ground color dark brown with a thin mid-lateral dark stripe. Phylogenetic relationships of the new species based on the shared presence of derived features related to posterior cranial fontanel and cleithrum are discussed. The new species is also compared to the only two described species from Andean tributaries of río Orinoco basin.


    Quote: Neotropical Ichthyology, 12(4): 717-728, 2014