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. This fish is unusual among suckermouths in its spectacular laser green colouration.
Tributaries of mid & upper Rio Orinoco & the Casiquiare drainage of the Rio Amazonas, Venezuela. Amazon, Middle Amazon (Solimoes), Negro, Casiquiare(click on these areas to find other species found there) Orinoco, Middle Orinoco(click on these areas to find other species found there) Orinoco, Upper Orinoco(click on these areas to find other species found there)
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