Abstract
Acestridium triplax, new species, is described from the Amazon River basin in Pará State, Brazil. The new species 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).
Highlights
Material and MethodsSpecies 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 color 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
We describe a new species of Acestridium first collected by Wolmar B
Summary
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 color 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. Number of measured specimens and range of standard length (SL) between parenthesis, geographical coordinates, date of collection, and collectors are added for the new species.
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