Dorsal soft rays (total): 11-13; Anal soft rays: 9
- 11; Vertebrae: 36 - 38. Similar to Trichomycterus
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). 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). 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). 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).
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.
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 ).