| Family: |
Characidae (Characins; tetras), subfamily: Stethaprioninae |
| Max. size: |
9.48 cm SL (male/unsexed) |
| Environment: |
benthopelagic; freshwater |
| Distribution: |
Central America: Quintana Roo, Caribbean versant of Yucatan Peninsula in Mexico, south to the Sittie River, Toledo district in Belize, west to Mopán in Guatemala. |
| Diagnosis: |
Dorsal soft rays (total): 9-11; Anal soft rays: 21-27; Vertebrae: 32-33. Astyanax bacalarensis is distinguished from its congeners in the Yucatan by the following characters: anal fin origin never overlapping last dorsal-fin ray (always overlapping in A. altior); head length 28% SL or less (27% or more in A. altior); predorsal length, mean 50.4% SL (mean 53% or more in A. altior and A. angustifrons); mean distance between origins of pelvic and anal fins, 20.5% SL (vs. mean 19.3% or less); humeral spot rectangular-triangular to oval (P-shaped to indistinct in A. belizianus and A. brevimanus) (Ref. 118583). |
| Biology: |
|
| IUCN Red List Status: |
Least Concern (LC); Date assessed: 09 September 2018 Ref. (130435)
|
| Threat to humans: |
harmless |
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