| Family: |
Characidae (Characins; tetras), subfamily: Tetragonopterinae |
| Max. size: |
12.1 cm SL (male/unsexed) |
| Environment: |
pelagic; freshwater |
| Distribution: |
South America: Sipaliwini, Maroni, Mana, Sinamary, Comté, Approuagua, and Oyapock River basins. |
| Diagnosis: |
Dorsal soft rays (total): 9-9; Anal soft rays: 23-27; Vertebrae: 29-29. This species is distinguished from its congeners, except T. rarus, by the number of scale rows between lateral line and pelvic fin origin 4.5-5.5 (vs. 3.5 scale rows); differs from T. rarus by the longitudinal dark stripes on the trunk which is absent (vs. present); differs from T. anostomus, T. denticulatus, T. kuluene, T. juruena by the principal teeth in dentary 4 (vs. 5-6) with larger and more robust teeth (vs. thinner and sharper teeth); differs from T. anostomus, T. kuluene by the conspicuous humeral marks 2 (vs. 1 and inconspicuous); differs from T. anostomus by the mouth being terminal (vs. subsuperior); differs from T. anostomus, T. araguaiensis with gill rakers on the lower limb of the first gill arch 10-12 (vs. 17-20) and upper limb 7-8 (vs. 10-12); differs from T. argenteus by the predorsal scales 8 (vs. 11-17), and from T. carvalhoi by having a rounded dark mark on the caudal peduncle (vs. a lozenge-shaped); differs from T. ommatus by teeth on maxilla 1-4 (vs. 7-8) and with a dark mark centered on caudal peduncle (vs. mark limited to the posterior portion of the caudal peduncle) (Ref. 124043). |
| Biology: |
Occupies the counter current zones of rivers where it hides under the rocks. It is constantly on the look out for food items that fall into the water (Ref. 12225). |
| IUCN Red List Status: |
Least Concern (LC); Date assessed: 01 March 2007 Ref. (130435)
|
| Threat to humans: |
harmless |
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