Lithogenes

Lithogenes is a genus of South American catfish of the family Loricariidae. It is the only genus within the subfamily Lithogeneinae.

Lithogenes
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Siluriformes
Family: Loricariidae
Subfamily: Lithogeneinae
Genus: Lithogenes
Eigenmann, 1909

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.[1] Relative to an undescribed species of Lithogeneinae, L. valencia has sister group relationship to L. villosus.[2]

Species

The three recognized species in this genus are:[3]

Appearance and anatomy

As members of the family Loricariidae, all Lithogenes species have a suckermouth. However, unlike most loricariids, species of the genus Lithogenes possess armor plating only on the latter half of the body. Their eyes are small and their bodies flattened.[2][1]

Distribution and habitat

L. villosus originates from the Essequibo River drainage of the Guiana Shield.[4] An undescribed species of Lithogenes is known from the Orinoco basin of the Guiana Shield.[2] 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.[2]

L. villosus lives in habitats dominated by rapids over bedrock, and L. valencia likely does, as well.[2][1]

References
  1. Schaefer, Scott A. (2003). "Relationships of Lithogenes villosus Eigenmann, 1909 (Siluriformes, Loricariidae): Evidence from High-Resolution Computed Microtomography" (PDF). American Museum Novitates. American Museum of Natural History (3401): 1–55. doi:10.1206/0003-0082(2003)401<0001:ROLVES>2.0.CO;2. ISSN 0003-0082. S2CID 36180254.
  2. Provenzano R., Francisco; Schaefer, Scott A.; Baskin, Jonathan N.; Royero-Leon, Ramiro (2003). Buth, D. G. (ed.). "New, Possibly Extinct Lithogenine Loricariid (Siluriformes, Loricariidae) from Northern Venezuela" (PDF). Copeia. American Society of Ichthyologists and Herpetologists. 2003 (3): 562–575. doi:10.1643/CI-02-160R1. S2CID 9191738.
  3. Froese, Rainer and Pauly, Daniel, eds. (2011). Species of Lithogenes in FishBase. December 2011 version.
  4. Froese, Rainer; Pauly, Daniel (eds.) (2007). "Lithogenes villosus" in FishBase. May 2007 version.
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