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Down arrow Cat-eLog Data Sheet
Scientific Name Acestridium triplax  Rodriguez & Reis, 2007
Common Name Whiptail Catfish
Type Locality Municipio de Juruti, igarapé Mutum, tributary to rio Aruã, a tributary to rio Branco, a tributary. to rio Aripiuns, itself a tributary to the lower rio Tapajós, 2°36'45''S, 56°11'37''W, Pará State, Brazil.
Etymology The species epithet triplax from the Greek tri, three, and plax, plate, referring to the three series of abdominal plates.
Down arrow Species Information
Size 56mm or 2.2" SL. Find near, nearer or same sized spp.
Identification 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.

A. triplax can be distinguished from all its congeners by having one series of middle abdominal plates between the lateral abdominal plates (vs no abdominal plates between the lateral abdominal plates).
Sexing Males of Acestridium triplax have conspicuous urogenital papilla, immediately posterior to anal opening, these are not present in females.
Down arrow Habitat Information
Distribution South America: Rio Tapajós drainage, Amazon River basin in Brazil.
Amazon, Lower Amazon, Tapajós (click on these areas to find other species found there)

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IUCN Red List Category Not Evaluated
Down arrow Husbandry Information
Furniture In the wild inhabits small forest creeks which are usually shallow (0.3-1.0 m deep, 5-10 m wide), with a sandy bottom, clear or slightly black water, moderate water current and dense aquatic and marginal vegetation.
Breeding Unreported.
Breeding Reports There is no breeding report.
Down arrow Further Information
Reference Neotropical Ichthyology v. 5 (no. 4), pp 429, Figs. 1, 2A, 3A, 4A.
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Last Update 2021 Jan 23 08:21 (species record created: 2010 Jul 04 04:58)