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Pseudolithoxus dumus (Armbruster & Provenzano, 2000)

Image contributors to this species:

Yann Fulliquet (6) Karsten Schönherr (1)

ScotCat Sources:

Etymology = Genus 

Other Sources:

Fishbase  Google Search  All Catfish Species Inventory  Wikipedia

Relevant Information:

The genus Pseudolithoxus includes four species, P. anthrax, P. dumus, P. nicoi, and P. tigris, previously described as the Lasiancistrus anthrax group. They 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. Dorsal spines (total): 2 - 2; Dorsal soft rays (total): 7 - 7; Anal spines: 1; Anal soft rays: 5. Body color light with large, black spots at least anteriorly; spots may combine posteriorly to form bars. Tips of dorsal and caudal spines with light orange to cream-colored spots. Lateral line plates 24-25; dorsal plates 6-9; interdorsal plates 6-7; adipose-caudal plates 6-7; folded dorsal fin plates 11-14; and postanal plates 11-13. P.dumus is diagnosed from other Pseudolithoxus species by the presence of a light body colour with large, black spots at least anteriorly (spots may combine posteriorly to form bars) P.dumus can also be separated from all but P.tigris by the presence of light orange to cream-coloured spots at the tip of the dorsal and caudal fin spines. First appeared in the DATZ magazine in Nov.1997, page 697. Aquarium Care: I would suggest a minimum size of 48” x 18” X 18” for one or two of these catfish, with plenty of hiding places amongst bogwood and plantsand the ideal aquarium substrate to use would be aquarium sand such as BD Aquarium Sand. As with all other species of fish, water quality and general husbandry is very important, and I would recommend that a minimum of 25% water is changed on a weekly basis. This fish has similar requirements to other loricariids, so should do well under normal aquarium conditions. Sexual differences: 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. Diet: Omnivore: vegetable and animal foods such as green foods, vegetable tablets, live and frozen foods.

Common Name:



Lasiancistrus dumus


Loricariidae ycipitidae


South America: Orinoco Basin, upper and Casiquiare River basins


13cm. (5ins)


25-29°c (77-85°f.)




Armbruster, J.W. and F. Provenzano, 2000. Four new species of the suckermouth armored catfish genus Lasiancistrus (Loricariidae: Ancistrinae). Ichthyol. Explor. Freshwat. 11(3):241-254.
ScotCat Factsheet no. 164. Feb 2010



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