Cordylancistrus Isbruecker

Francisco Provenzano & Nadia Milani, 2006, Cordylancistrus nephelion (Siluriformes, Loricariidae), a new and endangered species of suckermouth armored catfish from the Tuy River, north-central Venezuela., Zootaxa 1116, pp. 29-41 : 38

[[ Cordylancistrus Isbruecker ]]

Artificial key for the species of the genus Cordylancistrus

A) Lateral plates of the body without spiny keels.............................................................B

Lateral plates of the body with spiny keels..................................................................... ............................................ Cordylancistrus platycephalus (Boulenger, 1898) Ecuador

B) Evertible odontodes of the interopercular area well developed (hypertrophied), visible and numerous (generally 10 or more)..........................................................................C

Evertible odontodes of the interopercular area inconspicuous and reduced in number to two or three...................... Cordylancistrus platyrhynchus (Fowler, 1943) Colombia

C) Edge of the posterior lip without undulations..............................................................D

Edge of the posterior lip with marked undulations.......................................................E

D) Color pattern of the body and fins uniform, grayish-green to light or dark brown. Head depth 17.4-19.0% of standard length. Longest evertible interopercular odontode doesn't reach the cleithral spine....................................................................................... ................................... Cordylancistrus perijae Perez and Provenzano, 1996 Venezuela

Color pattern of the body with a midlateral irregular dark stripe with four or five vertical projections, these projections join in the dorsal region and surround four to five pale areas, fins with three to four dark bands, distal border of the first dorsal rays pale, distal border of the upper lobe of the caudal-fin rays pale. Head depth 14.6-16.4% of standard length. Longest evertible interopercular odontode reaches the end of the cleithral spine................................ Cordylancistrus torbesensis (Schultz, 1944) Venezuela

E) Color pattern of the body uniform light to dark brown, without spots. Fins spines with three to four whitish spots. Head depth 14.3-17.7% of standard length........................ .................................................. Cordylancistrus daguae (Eigenmann, 1912) Colombia

Color pattern of the body grayish-green with whitish irregular spots. Fins spines with four to six whitish spots. Head depth 17.2-20.2% of standard length ........................... ......................................................... Cordylancistrus nephelion new species Venezuela