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Trichomycterus trefauti
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Siluriformes
Family:	Trichomycteridae
Genus:	Trichomycterus
Species:	T. trefauti
Binomial name
Trichomycterus trefauti Wosiacki, 2004

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.

References

• Wosiacki, W. B. (2004). "New species of the catfish genus Trichomycterus (Siluriformes, Trichomycteridae) from the headwaters of the rio São Francisco basin, Brazil" (PDF). Zootaxa. 592: 1–12. doi:10.11646/zootaxa.592.1.1.
• Froese, Rainer; Pauly, Daniel (eds.). "Trichomycterus trefauti". FishBase. February 2012 version.

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• Trichomycterus
• Pencil catfish of Brazil
• Endemic fish of Brazil
• Fish of the São Francisco River basin
• Fish described in 2004
• Trichomycteridae stubs