Tetragonopterus argenteus Cuvier, 1816 |
photo by
Hoffmann, P. and M. Hoffmann |
Family: | Characidae (Characins; tetras), subfamily: Tetragonopterinae | |||
Max. size: | 11.2 cm SL (male/unsexed) | |||
Environment: | pelagic; freshwater; pH range: 5.80000019073486 - 8.5; dH range: 30 | |||
Distribution: | South America: Amazon basin, upper Essequibo, Orinoco, Parnaíba, Jaguaribe, Paraguay and lower Paraná river basins. | |||
Diagnosis: | Dorsal soft rays (total): 9-9; Anal soft rays: 28-40; Vertebrae: 27-27. This species is distinguished from all its congeners by the following characters: predorsal scales 11-17 (vs. 7-9); differs from T. anostomus, T. denticulatus, T. kuluene, T. juruena by the principal teeth in dentary 4 (vs. 5-6), and larger and more robust teeth (vs. thinner and sharper); differs from T. anostomus, T. araguaiensis by the number of gill-rakers on the upper limb of the first gill arch 12-15 (vs.17-20); differs from T. anostomus by having a terminal mouth (vs. subsuperior mouth); differs from T. ommatus the maxillary teeth 1-4 (vs. 7-8) and by the presence of a conspicuous dark mark on the caudal peduncle (vs. inconspicuous mark limited to the posterior portion of the caudal peduncle); differs from T. carvalhoi by having a rounded dark mark on the caudal peduncle (vs. lozenge-shaped dark mark on the caudal peduncle); differs from T. rarus by the absence of dark longitudinal stripes on the trunk (vs. presence of such stripes); differs from T. rarus, T. georgiae having the scale rows between lateral line and pelvic-fin origin 3.5 (vs. 4.5-5.5); differs from T. denticulatus by having humeral marks separated by one or two vertical rows of scales (vs. humeral marks separated by three vertical scale rows) (Ref. 124043). | |||
Biology: | Consumed locally for recovery or during illness. Carnivorous (Ref. 42843). | |||
IUCN Red List Status: | Least Concern (LC); Date assessed: 04 March 2021 Ref. (130435) | |||
Threat to humans: | harmless | |||
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