| Characidae (Characins; tetras), subfamily: Tetragonopterinae |
| 6.79 cm SL (male/unsexed) |
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benthopelagic; freshwater |
| South America: middle Rio Araguaia in Brazil. |
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Dorsal soft rays (total): 9-9; Anal soft rays: 32-35. This species is distinguished from all its congeners, except T. anostomus, T. juruena, T. kuluene, by the principal teeth on dentary 5-6 (vs. 4) and by having thinner and sharper teeth (vs. larger and more robust); differs from T. anostomus by the terminal mouth (vs. subsuperior mouth); differs from T. anostomus, T. kuluene by the conspicuous humeral marks 2 (vs. 1); differs from T. anostomus, T. araguaiensis by the number of rakers on the lower limb and upper limb of the first gill arch 13-14 and 8-9. respectively (vs. 17-20 and 10-12); differs from T. juruena, T. kuluene by the scale rows between lateral line and dorsal-fin origin 7 (vs. 6); differs from T. argenteus by the predorsal scales 8 (vs. 11-17); differs from T. carvalhoi by the presence of a rounded dark mark on caudal peduncle (vs. a lozenge-shaped mark); differs from T. rarus, T. georgiae by the scale rows between lateral line and pelvic-fin origin 3.5 (vs. 4.5-5.5); differs from T. rarus by the absence of dark longitudinal stripes on the trunk (vs. presence); differs from T. ommatus by the maxillary teeth 3-4 (vs. 7-8) and by having a mark centered on caudal peduncle (vs. mark limited to the posterior portion of caudal peduncle) (Ref. 124043). |
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Least Concern (LC); Date assessed: 07 November 2018 Ref. (130435)
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| harmless |
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Type locality of Tetragonopterus denticulatus, Goias, Aragarc¸as, Rio Araguaia, Amazon basin. Known from the middle Rio Araguaia, at the border of the states of Goiás and Mato Grosso, central Brazil (Ref. 93280) and extending Rio Tocantins (Ref. 124043). |
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