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Mark Henry Sabaj (1) Angelo Rodrigo Manzotti (1) Kiruya Momochi (2)

Description: Body elongate and slender. Head short (four to five times in SL), depressed, and dorsally covered by thin skin. Eyes small, placed dorsally on head. Anterior nares tubular. Mouth gape terminal, slightly superior. Lower jaw a bit longer than upper jaw, with irregular rows of minute conical teeth. Maxillary barbells surpassing distal border of pectoral fin. Bases of outer and inner mental barbells in a straight line; outer ones reaching pectoral-fin origin, inner ones extended to distal margin of opercular membrane. Dorsal-fin origin nearer snout tip than caudal-fin base. Adipose fin 5.2-5.9 times in SL, its origin placed behind the vertical through anal-fin origin. Caudal fin deeply forked, lower lobe slightly longer than the upper one. Dorsal fin with a weak spine and 6 branched rays, pectoral fin with 8 and pelvic fin with 6 rays. Distal margin of anal fin rounded, with 11 or 12 rays (Giorgis et. al 2012). Etymology: The specific name of tenebrosa meaning dark, referring to darker coloration compared to its presumed congener at the time, Imparfinis piperatus. Remarks: In the IUCN Red List of Threatened Species it is classified as data deficient or not evaluated.

None

Imparfinis tenebrosus, Heptapterus tenebrosus

Heptapteridae

South America: Upper Paraná and São Francisco River basins, Brazil. Type locality: Rio Mogi Guaçu, entre o pesqueiro da EE [=Estação Experimental de Piscicultura de Pirassununga] e o pesqueiro do Sr. Firmino (Faz. Graciosa) ca. 1 km abaixo da Cachoeira [Brazil].

7.5cm. (3ins)

24-26°C (75-79°F)

6.0-7.0.

Bockmann, F.A. and G.M. Guazzelli, 2003. Heptapteridae (Heptapterids). p. 406-431. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil.
Ferraris, C.J. Jr., 2007. Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types. Zootaxa 1418:1-628.
Froese, R. and D. Pauly. Editors. 2019. FishBase. World Wide Web electronic publication. www.fishbase.org, ( 01/2019 ).
Giorgis, Pablo & Ciotek, Liliana & Almirón, Adriana & Casciotta, Jorge. (2012). First record of Phenacorhamdia tenebrosa (Schubart, 1964) (Siluriformes, Heptapteridae) from the Paraná river basin in Argentina.. Ichthyological Contributions of PecesCriollos. 24. 1-4.