Corymbophanes
Corymbophanes is a genus of armored catfish native to South America where they are only known from Guyana. "Corymbophanes" was originally placed in its own tribe Corymbophanini, but the first comprehensive molecular phylogenetic analysis of the subfamily Hypostominae found "Corymbophanes" to be nested within the tribe Ancistrini. Taxonomy. "Corymbophanes" and its type species, "C. andersoni", were first described in 1909 by Carl H. Eigenmann. In 2000, they were redescribed along with the description of a new species, "C. kaiei". In 2004, the tribe Corymbophanini was erected. "Corymbophanes" represents an old lineage as it lacks many of the characteristics of  the rest of the subfamily Hypostominae. This group probably has a basal position within the subfamily. Species. There were previously two recognized species in this genus. A third species was described in a 2020 study. Distribution and habitat. "Corymbophanes" species originate from the upper Potaro River of the Essequibo River drainage system. "C. andersoni" is only known from the Chenapou Falls of this river. "C. kaiei" is only known from the Oung Creek, a small tributary of the Potaro River drainage. Neither of these species are found downstream of the Kaieteur Falls. "Corymbophanes" species live in swift riffles over gravel  and cobble and among submerged logs. Appearance and anatomy. Like other Loricariids, "Corymbophanes" species have plates of armor on their body and a suckermouth. Small odontodes are also present along their body. This genus can be distinguished from all other Loricariids by the presences of a dorsal ridge formed by plates between the dorsal fin and the caudal fin, the absence of the adipose fin, as well as the absence of the omega iris that most loricariids possess. "Corymbophanes" species do not have evertible cheek plates and do not hypertrophied cheek odontodes which are present in many other loricariid species , which differentiates it from the few species that possess the aforementioned ridge. Species of this genus do not get very large; "C. andersoni" does not exceed 8.6 centimetres (3.4 in) and "C. kaiei" does not exceed . These fish are dark brown to black with white or cream-colored markings. "C. kaiei" has alternating light and dark bands on its caudal fin; also, this species has a dark-colored abdomen with light vermiculations in adults. By contrast, "C. andersoni" has no bands on the caudal fin, has no vermiculations, and the abdomen is light-colored.