the most widespread species, occurring in the Orinoco, Branco, Negro, and Amazonas rivers downstream of its confluence with Rio Negro.
Three species of Scorpiodoras are recognized: S. calderonensis, S. heckelii, and S. liophysus; the latter species is described herein. Scorpiodoras calderonensis occurs in the upper Amazon basin, including the Solimo˜es, Jurua´ , Japura´ , and Tefe´ rivers. Its type locality, originally stated as ‘‘Caldero´ n’’, is elucidated as Tabatinga, Brazil. Scorpiodoras heckelii is the most widespread species, occurring in the Orinoco, Branco, Negro, and Amazonas rivers downstream of its confluence with Rio Negro. Scorpiodoras liophysus is only known from the middle Rio Madeira basin and presents a morphological feature unique within the genus: gas bladder without secondary bladder. An osteological description of the genus is provided, as well as redescriptions of S. calderonensis and S. heckelii. Additionally, a key allowing identification of the species is presented, as well as a biogeographic discussion.
Distribution of Scorpiodoras
Fig. 14. Scorpiodoras liophysus, INPA 33829, holotype, 125.5 mm SL.
Scorpiodoras liophysus, new species
Holotype.—INPA 33829, 125.5 mm SL, Brazil, Rondoˆnia, Porto Velho, Lago Madalena, Rio Jaciparana´ , Rio Madeira, 9u179000S
Sousa, L.M. & Birindelli, J.L.O. 2011. Taxonomic Revision of the Genus Scorpiodoras (Siluriformes: Doradidae) with Resurrection of Scorpiodoras calderonensis and Description of a New Species. Copeia. 2011 (1): 121-140.