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Brief Summary

    Trichomycterus trefauti: Brief Summary
    provided by wikipedia

    Trichomycterus trefauti is a species of pencil catfish presently only known from the upper basin of the São Francisco River in Minas Gerais state, Brazil.

    This is a small, cylindrical catfish (35–55 mm standard length) which can most readily be distinguished from its congeners by its uniformly grey colouring, marked only by a distinctive elliptical dark spot at the base of the caudal fin. Other notable features include widely spaced eyes, very long barbels, the extension of the first ray of the pectoral fin into a long filament and pelvic fins which completely cover the anus and urogenital openings.

Comprehensive Description

Morphology

    Morphology
    provided by Fishbase
    Dorsal spines (total): 2; Dorsal soft rays (total): 7; Analspines: 1; Analsoft rays: 6

Diagnostic Description

    Diagnostic Description
    provided by Fishbase
    Trichomycterus trefauti differs from all other known members of the sub-family Trichomycterinae by the autapomorphic presence of ann elliptical, vertically elongated, brown spot, at caudal-fin base (vs. without elliptical spot at caudal-fin base), and the combination of homogeneously gray color pattern (vs. yellowfish, presence of stripes or or bands, or lack of color pattern), first pectoral-fin ray prolonged as a filament (vs. not prolonged), subterminal mouth (vs. inferior or terminal mouth), two supraorbital pores at interorbital space (vs. one supraorbital pore at mesial line), caudal fin truncate with attenuated edges (vs. caudal fin rounded), pelvic fins covering anus and urogenital openings (vs.not covering), interorbital space very wide 39.8-45.9% HL(vs. more or less than 39.8-45.9% HL), maxillary barbels very long 84.2-93.0% HL (vs.more or less than 84.2-93.0% HL), rictal barbels very long 67.6-74.3% HL (vs.more or less than 67.6-74.3%HL).

Threats

    Threats
    provided by Fishbase
    Not Evaluated