Distinguished from all known aspredinids by having
five stout papillae along upper lip and mentum with
two pairs of longer barbels and about 36 short, papillae-like
barbels. Distinguished from all other species of Hoplomyzontini
by having snout deeply emarginate at midline, appearing
bilobed. Differs further from its only congener in
having (1) no slender rictal barbel; (2) dorsal-fin
rays i,3,i (vs. i,6); (3) maxillary barbel relatively
short, not extending posterior to pectoral-fin origin
( 1 3% vs. 1 9.5% standard length, extending posteriorly
beyond pectoral-fin origin); (4) lateral-line scutes
in zig-zag pattern (vs. rela- tively straight line);
(5) second pelvic-fin ray longest, extending posteriorly
as short filament (vs. third ray longest and not extended);
and (6) dorsal and anal fins attached posteriorly
to body midline by membranes (vs. not attached).
Habitat: Ecuador, Napo Province, Rio Aguarico,about
1 km upstream from confluence with Rio Shushufindi,
lat. 0°17'S, long. 76°25.4'W. Etymology:
From the Latin papillatus, with buds, in reference
to the numerous short, papillae like mental barbels.
Napo and Portuguesa River basins. Type locality:
Rio Aguarico,about 1 km upstream from confluence with
Rio Shushufindi, lat. 0°17'S, long. 76°25.4'W.
1989. An atlas of freshwater and marine catfishes.
A preliminary survey of the Siluriformes. T.F.H. Publications,
Inc., Neptune City, New Jersey (USA). 784 p. Froese, R. and D. Pauly. Editors.
2022. FishBase. World Wide Web electronic publication.
www.fishbase.org, version (04/2022). Stewart, D.J. 1985. A review of the
South American catfish tribe Hoplomyzontini (Pisces,
Aspredinidae) with descriptions of new species from