Description:Species of Acestridium Haseman, 1911
are highly distinctive, small sized, specialized loricariid
catfishes, which have very narrow body, snout prolonged
with a distinctive anterior spatulate projection,
and usually green colour in life.
Acestridium was diagnosed by Schaefer (1991)
based on the following characters: ten principal caudal-fin
rays; plates at anterior snout margin forming conspicuous
spatulate projection; head and body very slender,
depressed; dorsal surface of head and trunk with longitudinal
ridges; dorsal fin placed posteriorly, well beyond
pelvic fin and just anterior to anal-fin origin; adipose
fin absent; dermal plates anterior to first dorsal-fin
proximal radial expanded, bearing ventromedial keel
contacting the dorsal margin of the neural arches
of the vertebrae six through twelve; and ridge of
bone on the ventral surface of the lateral ethmoid
contacting the metapterygoid channel reflected mesially.
Currently, seven species of Acestridium are
1911, A. dichromum Retzer, Nico & Provenzano,
1999, A. martini Retzer, Nico & Provenzano,
1999. A. triplax, Rodriguez & Reis, 2007,
A. gymnogaster Reis & Lehmann, 2009,
A. scutatum Reis & Lehmann A., 2009,
colombiense Retzer, 2005. Aquarium
Care: will need a fairly strong current in
the aquarium. Not the easiest to care for so really
a catfish for the more experienced Loricariid keeper,
so would be better in a species tank on their own.
Diet: Fine Vegetarian foods especially
algae and small meaty foods such as brine shrimp nauplii.
They rarely sit on the substrate but on leaf stalks
and branches so they are especially difficult to feed.
Upper Orinoco and Negro River basins, Venezuela. Type
locality: Caño Pozo Azul, tributary
of Río Orinoco, near Balneario Pozo Azul, 5º45'49"N,
67º29'21"W, Amazonas State, Venezuela, elev.
Ferraris, C.J. Jr.,
2007. Checklist of catfishes, recent and fossil (Osteichthyes:
Siluriformes), and catalogue of siluriform primary
types. Zootaxa 1418:1-628.
Froese, R. and D. Pauly. Editors. 2022. FishBase.
World Wide Web electronic publication. www.fishbase.org,
( 07/2022 ). Schaefer, S.A., 2003. Loricariidae
- Hypoptopomatinae (Armored catfishes). p. 321-329.
In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr.
(eds.) Checklist of the Freshwater Fishes of South
and Central America. Porto Alegre: EDIPUCRS, Brasil.