Rhabdolichops navalha
Rhabdolichops lundbergi
Sandra B Correa, William G.R Crampton, and James S Albert
Три новых вида электрических рыб из семейства Sternopygidae из Амазонки.
Three New Species of the Neotropical Electric Fish Rhabdolichops (Gymnotiformes: Sternopygidae) from the Central Amazon, with a New Diagnosis of the Genus.ABSTRACT
Three new species of the Neotropical electric fish Rhabdolichops are described from the lowland Central Amazon Basin of Brazil. These taxa are described using features of color pattern, morphometric and meristic traits, squamation, and osteology. Rhabdolichops nigrimans and R. navalha are known only from low-conductivity blackwater systems whereas R. lundbergi occurs almost exclusively in the main channel of high-conductivity whitewater rivers and adjacent floodplain channels. Rhabdolichops nigrimans and R. lundbergi are sister species, forming a sister clade to all other Rhabdolichops species, and retaining transitional phenotypes between the genera Eigenmanniaand Rhabdolichops. Rhabdolichops nigrimans, but not R. lundbergi, displays a striking sexual dimorphism in caudal appendage length. Rhabdolichops navalha and R. stewarti are sister species nested within a clade comprising R. eastwardi and R. caviceps + R. troscheli. Rhabdolichops navalha exhibits a unique morphology of the electric organ where the posterior margin ends abruptly and is replaced posteriorly by rigid and transparent non electrogenic tissue.
Sandra B Correa, William G.R Crampton, and James S Albert
Copeia: Vol. 2006, No. 1, pp. 27–42.