Phylum Chordata Order Catfish | Scientific name Lithogenes Rank Genus | |
Subfamily LithogeneinaeGosline, 1947 Similar Catfish, Neoplecostominae, Hypoptopomatinae, Hypostominae, Loricariinae | ||
Lithogenes is a genus of South American catfish (order Siluriformes) of the family Loricariidae. It is the only genus within the subfamily Lithogeneinae.
Contents
Taxonomy
Lithogenes is the only genus within the subfamily Lithogeneinae. This genus and subfamily, the most basal group in Loricariidae, is the sister group to the rest of the family. Relative to an undescribed species of Lithogeneinae, L. valencia has sister group relationship to L. villosus.
Species
The three recognized species in this genus are:
Appearance and anatomy
As members of Loricariidae, Lithogenes species have a suckermouth. However, unlike most loricariids, Lithogenes possesses armor plating only on the latter half of the body. Their eyes are small and their bodies flattened.
Distribution and habitat
L. villosus originates from the Essequibo River drainage of the Guiana Shield. An undescribed species of Lithogenes is known from the Orinoco basin of the Guiana Shield. L. valencia has only been known from six specimens collected in the 1970s from tributaries of the Lake Valencia in northern Venezuela; however, this area has since been polluted and this species possibly is now extinct.
L. villosus lives in habitats dominated by rapids over bedrock, and L. valencia likely does, as well.