| Family: |
Acestrorhamphidae (American tetras), subfamily: Stygichthyinae |
| Max. size: |
5.61 cm SL (male/unsexed) |
| Environment: |
benthopelagic; freshwater |
| Distribution: |
South America: Rio Lençois in Bahia, Brazil. |
| Diagnosis: |
Vertebrae: 36-36. Distinguished from all other characid fishes by the following combination of characters: infraorbitals fused uniquely, resulting in less than six autogenous bones; presence of a single tooth row in the premaxilla; presence of cheirodontin-like teeth, somewhat pedunculated, expanded and compressed distally, with cusps similar in shape and perfectly aligned along dorsal margin; ventral margin of toothed portion of maxillary curved towards the ventral margin of the premaxilla and maxillary teeth forming a continuous series with premaxillary teeth; margins of pre- and postzygapophyses with projections anteriorly and posteriorly directed; accumulation of epithelial cells forming globular structures distributed over head and scales; and base of anal-fin without scales covering basal portion of unbranched and anterior branched rays (Ref. 54751).
Description: Dorsal-fin rays ii,8,i or ii,9. Anal-fin rays iv,14, iv,15, iv,16 or iv,17. Pectoral-fin rays i,10 or i,11. Pectoral-fin rays i,7 (Ref. 54751). |
| Biology: |
Found in shallow, headwater stream with fast water current over a rocky bottom and margin, with a small amount of riparian or submerged vegetation (Ref. 54751). Feeds on filamentous algae, terrestrial vegetal fragments and insects (Ref. 54751). |
| IUCN Red List Status: |
Least Concern (LC); Date assessed: 07 November 2018 Ref. (130435)
|
| Threat to humans: |
harmless |
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