for a uniquely pigmented species of loricariid catfish
from the upper Río Orinoco of Amazonas, Venezuela.
Description: Head and nape forming
arch from tip of snout to origin of dorsal fin. Body
depth decreasing from origin of dorsal fin to dorsal
procurrent caudal spines then increasing to caudal
fin. A rounded ridge present from anterodorsal corner
of orbit, running ventral to nares, and ending slightly
anteroventral of anterior nare. Longitudinal ridge
of raised bone and slightly larger odontodes present
on pterotic-supracleithrum beginning at posterodorsal
corner of orbit and contiguous with supraorbital ridge.
Space between orbits concave such that supraorbital
ridge higher than medial surface of head. Supraoccipital
convex medially with slight crest. Colouration:
Light gray to tan when alive, becoming tan when preserved.
Body densely covered with tiny spots, head spots even
smaller than body spots. Spots present on all fins,
generally larger than spots on body, evenly distributed
on rays, spines, and membranes. Caudal fin membranes
light and spotted anteriorly, fading to dark wash
posteriorly. Abdomen lighter than sides, with tiny
spots. Occasionally with four dorsal saddles, first
below anterior dorsal-fin rays, second below and slightly
behind posterior dorsal-fin rays, third below and
slightly anterior to adipose-fin spine, and fourth
at base of caudal peduncle; all saddles angled anteriorly,
saddles one and two combine and continue to base of
pelvic fin, third and fourth terminating at middle
of midventral plate row. Fin spines usually lighter
than rest of body. Spots relatively larger in juveniles.
Juveniles with fewer spots distally on all fins, lower
half of caudal fin much darker.
Venezuela. Currently known from the Río Ventuari,
a tributary of the upper Río Orinoco, and the
mainstem upper Orinoco above Puerto Ayacucho to the
Río Casiquiare in Amazonas.
Armbruster, J.W., L.A.
Tansey and N.K. Lujan, 2007. Hypostomus rhantos
(Siluriformes: Loricariidae), a new species from southern
Venezuela. Zootaxa 1553:59-68. Froese, R. and D. Pauly. Editors.
2021. FishBase. World Wide Web electronic publication.
www.fishbase.org, ( 06/2021 ). Werner, A. Lechner, W. & Schmidt Dr. J.
L-Welse L1 bis L400 MiniAtlas. Bede Verlag 2005. 392p.