Pseudolithoxus
| Pseudolithoxus | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Siluriformes |
| Family: | Loricariidae |
| Subfamily: | Hypostominae |
| Tribe: | Ancistrini |
| Genus: |
Pseudolithoxus Isbrücker & A. Werner, 2001 |
| Type species | |
|
Lasiancistrus tigris Armbruster & Provenzano, 2000 |
|
Pseudolithoxus is a genus of suckermouth armored catfishes native to South America where it is only found in Venezuela.
The species group was originally described in 2000 and the four species were temporarily placed in Lasiancistrus. In 2001, the genus Pseudolithoxus was erected for these species. This group forms a monophyletic sister group to Lasiancistrus and Ancistrus.P. anthrax and P. nicoi likely represent sister species. In 2011, P. kelsorum was described based on type material from Venezuela.
There are currently five recognized species in this genus:
Most species are restricted to Amazonas, Venezuela in the upper Orinoco, Ventuari, Casiquiare, and upper Negro rivers.
Pseudolithoxus species are characterized by evertible cheek plates, a very dorsoventrally flattened body, extremely hypertrophied odontodes (integumentary teeth) on elongated pectoral spines and along the snout margin, and 3 rows of plates on the caudal peduncle. In addition, it appears as if females as well as males develop hypertrophied snout and pectoral-fin odontodes, traits normally restricted to nuptial males in other loricariids.
Pseudolithoxus species may be differentiated based on colouration. Two species are black, usually with white spots, and lack dark bands on the caudal fin; P. nicoi has a white band at the distal margin of the caudal fin, while P. anthrax does not. P. dumus has a colour pattern consisting of black spots on the head and anterior part of body, while P. tigris has a colour pattern consisting of brown and tan bars on the head and anterior part of body. However, P. dumus and P. tigris may actually both represent more species. In P. dumus, specimens from northern Amazonas have a well-spotted caudal peduncle, those from the Ventuari and Cataniapo Rivers have spots along the mid-line on the caudal peduncle, and those from the Casiquiare have spots combining to form bands on the caudal peduncle. In some P. tigris, though specimens have similar colour patterns, they may differ in thickness of the tan bars and dark bars, body depth, and eye position.
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