| Characidae (Characins; tetras), subfamily: Tetragonopterinae |
| 6.25 cm SL (male/unsexed) |
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pelagic; freshwater |
| South America: middle portion of the Rio Araguaia in Brazil. |
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Dorsal soft rays (total): 9-9; Anal soft rays: 37-40. This species is distinguished from its congeners except Tetragonopterus anostomus by the number of gill rakers on the upper and lower limbs of the first gill arch, 10-12 and 18-20, respectively (vs. 8-10 and 12-14); differs from T. anostomus by the terminal mouth (vs. subsuperior); differs from T. anostomus, T. kuluene, T. juruena, T. denticulatus in the number of principal teeth in the dentary 4 (vs. 5-6) and also by having larger and more robust teeth (vs. thinner and sharper teeth); differs from T. argenteus by the number of predorsal scales 7-9 (vs. 111-17); differs from T. carvalhoi by having a spot on the caudal peduncle that is round (vs. lozenge-shaped spot); differs from T. ommatus by the teeth on the maxilla 0-2 (vs. 7-8) and having a centered mark on the caudal peduncle (vs. limited to the posterior portion of the caudal peduncle); 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 lack of dark stripes on the lateral surface of the body (vs. the presence of such stripes) (Ref. 124043).
Description: Dorsal-fin rays ii,9; anal-fin rays v, 32-35; pectoral fin with i,12-14; pelvic-fin rays i, 7; scales in longitudinal series 30-33; and scale rows between lateral line and pelvic-fin origin 3·5 (Ref. 93280). |
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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 araguaiensis, Goiás, Aruanã, Rio Araguaia, Amazon basin (Ref. 124043). Found in the middle portion of the Rio Araguaia in the municipalities of Aragarças, Aruaña, Cocalinho and Santa Terezinha, central Brazil (Ref. 93280). |
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