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Costa et al. 2022 (3)

Description: Dorsal soft rays (total): 11-13; Anal soft rays: 9 - 11; Vertebrae: 36 - 38. Similar to Trichomycterus alternatus, T. caudofasciatus, T. longibarbatus, and T. pantherinus, and can be diagnosed from other species of the Trichomycterus by the long filamentous first pectoral-fin ray about 50-70 % of the pectoral-fin length (vs. 0-40 %). Can be distinguised from T. pantherinus by the presence of the anteriormost section of the infraorbital canal (vs. absence) and 8 pectoral-fin rays (vs. 7); from T. alternatus by having 13-14 pleural ribs (vs. 10-12), and by the pelvic-fin insertion placed in a vertical through the centrum of the 17th or 18th vertebra (vs. 14-15th); from T. caudofasciatus by having pelvic-fin insertion, dorsal-fin and anal-fin origin in the vertical through 17th- 18th (vs. 14th-15th), 19th- 21st (vs. 17 th), 23nd- 24 th (vs. 21st- 22nd) respectively; from T. longibarbatus by having shorter nasal barbel, reaching middle of pectoral-fin base (vs. posterior portion of pectoral-fin base), more slender and narrower body (body depth 11.7-13.5 % SL, vs. 14.9-18.2 %, body width 6.4 -8.3 % SL, vs. 8.6- 12.9 %), shorter head (head length 16.8-19.5 % SL (vs. 20.4 - 21.8%), (Costa et al. 2022). Habitat: Occurs in fast running water stream, with about 2 m width and 1 m depth, sandy bottom and pale brown and turbid water. Also found in clear water stream with rocky bottom. Encountered under marginal vegetation and no specimen was seen swimming at daylight, suggesting a nocturnal or crepuscular behavior, (Costa et al. 2022). Colouration: Differs from all congeners from southeastern Brazilian river basins, by having a unique colour pattern, consisting of dark pigmentation concentrated along and above midline of flank, but absent below midline (vs. dark pigmentation extending to ventral portion of flank), (Costa et al. 2022). Diet: Will feed on most aquarium fare such as tablet, frozen and live foods. It is an opportunistic predator that mainly feeds on insects, but also will take small crustaceans and plant material (algae and remains of phanerogams).

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Trichomycteridae

South America: Rio Grande drainage, Rio Paraiba do Sul basin, southeastern Brazil. Type Locality: Endemic to the Rio Grande drainage, a tributary of the lower Rio Paraíba do Sul basin, in altitudes between about 300 and 600 m asl.

8.0cm. (3¼ins)

22-24°c (71-75°f.)

6.0-7.0.

Barbosa, M.A. and W.J.E.M. Costa, 2012. Trichomycterus puriventris (Teleostei: Siluriformes: Trichomycteridae), a new species of catfish from the rio Paraíba do Sul basin, southeastern Brazil. Verteb. Zool. 62(2):155-160.
Costa, W.J.E.M.; Mattos, J.L.; Vilardo, P.J.; Amorim, P.F.; Katz, A.M. Perils of Underestimating Species Diversity: Revisiting Systematics of Psammocambeva Catfishes (Siluriformes: Trichomycteridae) from the Rio Paraíba do Sul Basin, South-Eastern Brazil †. Taxonomy 2022. 2, 491-523.
Froese, R. and D. Pauly. Editors. 2022. FishBase. World Wide Web electronic publication. www.fishbase.org, ( 08/2022 ).