FMNH 52675, 65.5 mm SL, British Guiana, Upper Potaro River, Aruataima [Chenapou] Falls, col. by W. Grant, 1908.

AUM 28149 (3, 1 cleared and stained, 25.6 ? 57.0 mm SL) and INHS 49568 (2, 17.3 - 64.9 mm SL), Guyana, Mazaruni-Potaro, Potaro River (Essequibo River drainage), Chenapou Falls, 14.7 mi SW Mendeís Landing (Kaiteur Falls), 05°00í05"N, 59°37í33"W, col. by L.M. Page, J.W. Armbruster, M. Hardman, J.H. Knouft, W.S. Prince, 31 October 1998.

Corymbophanes andersoni is distinguished from Corymbophanes kaiei by a lack of vermiculations on the abdomen, a lack of bands on the caudal fin, anal fin I4 (vs. I5), a narrow (vs. wide) caudal peduncle, and five plates below the adpressed pectoral-fin spine (vs. 3-4).  Corymbophanes andersoni and Corymbophaneskaiei do not overlap in the following relative measurements: head length, internares width, interorbital width, orbit diameter, snout length, mouth width and length, snout-pectoral length, thorax length, anal fin length, dorsal-pectoral length and anal fin-adipose length.  Too few individuals are available to assess statistical differences of morphometrics.  Based on data available, C. andersoni appears to be unique among loricariids in the growth of the eyes and the interdorsal length.  Orbit diameter and interdorsal length initially increase, but reach an asymptote and then no longer increase.  The change in relative interdorsal length in C. andersoni is not accompanied by a decrease in plates between the dorsal and adipose fins or an increase in postdorsal ridge plates.  Osteologically, C. andersoni is diagnosed by the presence of an enlarged rib of the sixth vertebral centrum that is greatly widened at its tip, the mesethmoid forming a shelf anterior to mesethmoid disk, and a tall levator arcus palatini crest on the hyomandibula.

See genus description for more details.  Color pattern dark brown to black with large white spots dorsally and laterally.  Ventral surface mostly white medially, with scattered chromatophores laterally and around anus and anal fin. Fins occasionally with small, light markings, but never with distinct bands.  Fin membranes dark basally and along fin rays and spines, clear elsewhere.  Juveniles with relatively larger white spots; abdomen almost entirely white.  The smallest individual examined (17.3 mm SL) incompletely plated; plates best developed anteriorly and posteriorly; intervening space with incompletely developed plates.  Teeth 56-77 per jaw ramus (average = 66.7 ± 5.9; N = 12 rami, three individuals).

Compared to Corymbophanes kaiei: head long; eyes and nares close-set; orbit small; snout long; mouth wide and long.  Body widest at insertion of pectoral fin, tapering to caudal fin.  Caudal peduncle very narrow, roughly triangular in cross section.  Pectoral fin slightly overlapping pelvic fin when adpressed; five plates below adpressed pectoral-fin spine.  Anal fin I4.

Most specimens of Corymbophanes andersoni were collected in a shallow, black bedrock riffle within Chenapou Falls that had numerous cracks and crevices and some cobble and gravel.  One specimen was collected in a gravel and cobble riffle off the main channel of the Potaro River.

Known only from the type locality, Chenapou (Aruataima) Falls on the Potaro River above Kaiteur Falls in western Guyana .  Red star = C. andersoni, Blue circle = Corymbophanes kaiei, 1 = the village of Chenapou, 2 = the former location of Holmia, 3 = Chenapou (Aruataima) Falls.

Armbruster, J.W., M.H. Sabaj, M. Hardman, L.M. Page, and J.H. Knouft. 2000.  The Loricariid Catfish Genus Corymbophanes with Description of One New Species: C. kaiei. Copeia.