Tetragonopterus anostomus Silva & Benine, 2011

Family:  Characidae (Characins; tetras), subfamily: Tetragonopterinae
Max. size:  12.9 cm TL (male/unsexed); max.weight: 39.3 g
Environment:  pelagic; freshwater
Distribution:  South America: Brazil.
Diagnosis:  Dorsal soft rays (total): 9-9; Anal soft rays: 26-30. This species is distinguished from all its congeners by having the following characters: a subsuperior mouth (vs. terminal mouth); differs from all congeners except T. araguaiensis by having 17-19 gill rakers on the lower limb of the first gill arch (vs. 11-14); differs from its congeners, except T. denticulatus, T. juruena, T. kuluene by bearing 5-6 principal teeth on dentary (vs. 4) and thinner and sharper teeth on dentary (vs. large and more robust teeth); differs from T. ommatus by having 2-4 teeth on maxilla (vs. 7-8) and with a mark centered on the caudal peduncle (vs. mark limited to the posterior portion of the peduncle); differs from T. carvalhoi by the presence of a rounded mark on the caudal peduncle (vs. a lozenge-shaped mark); differs from T. rarus by the absence of longitudinal dark stripes on the flank (vs. the presence of stripes); differs from T. rarus, T. georgiae by having 3.5 longitudinal scale rows between lateral line and pelvic-fin origin (vs. 4.5-5.5); differs from T. argenteus by having 8 predorsal scales (vs. 11-17) (Ref. 124043).
Biology: 
IUCN Red List Status: Least Concern (LC); Date assessed: 07 November 2018 Ref. (130435)
Threat to humans:  harmless


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