Abstract
A new Tyttocharax species from the Güejar River system, near the Macarena Mountains in Colombia is described. This is the first record for the genus from the Orinoco basin. The combination of the following characters distinguish Tyttocharax metae from its congeners: presence of bony hooks on the pectoral and caudal-fin rays; bony hooks on the anal-fin rays larger than those on the pelvic-fin rays; pectoral-fin rays i,5-6,i; presence of three unbranched dorsal-fin rays; absence of an adipose fin; four scales rows between the anal-fin origin and the lateral line; and four scale rows between the pelvic-fin and the lateral line. Ecological characteristics of the habitat of the new species are also presented.
Highlights
The subfamily Stevardiinae sensu Mirande (2010) comprises several characid genera previously listed as incertae sedis in Characidae by Lima et al (2003), as well as all members of the inseminating characids of the subfamilies Stevardiinae and Glandulocaudinae sensu Weitzman et al (2005)
Three valid species are recognized in Tyttocharax, all originally described from the Amazon River basin: T. madeirae Fowler, 1913, T. cochui (Ladiges, 1950), and T. tambopatensis Weitzman & Ortega, 1995
In this paper we describe a new species of Tyttocharax, providing morphometrics, pigmentation, and osteological
Summary
The subfamily Stevardiinae sensu Mirande (2010) comprises several characid genera previously listed as incertae sedis in Characidae by Lima et al (2003), as well as all members of the inseminating characids of the subfamilies Stevardiinae and Glandulocaudinae sensu Weitzman et al (2005). Weitzman & Fink (1985) described five synapomorphies that diagnose Tyttocharax: (1) in sexually mature males bony hooks are confined to the posterior six to eight anal-fin rays. These hooks are relatively large and arranged in a vertically elongate cluster. A new species of Tyttocharax from the Güejar River characters for both sexes, to distinguish it from all congeners It is the first record of the genus from the Orinoco River basin, greatly expanding the known range to include the region around the La Macarena mountain range of the Guaviare River drainage in Colombia
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