| Main Ref. | Schmitter-Soto, J.J., 2017 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral | |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | |
| Type of scales | |
| Diagnosis |
Astyanax macal is distinguished from other congeners in Yucatan, Peten and Belize by having the following characters: predorsal length, 50% SL or shorter (50% or longer in A. altior and A. angustifrons); least depth, 12% SL or less (12% or more in A. altior); origin of anal fin usually without overlap to last dorsal-fin ray (usually overlapping in A. baileyi); double scaly sheath in anal-fin base (vs. single); bifid nuptial tubercles in male (vs. always simple); rostral fontanel, sides convex (vs. usually straight) (Ref. 118583). |
| Ease of Identification |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | 34 - 37 |
| Pored lateral line scales | |
| Scales in lateral series | |
| Scale rows above lateral line | 7 - 8.5 |
| Scale rows below lateral line | |
| Scales around caudal peduncle | 14 - 16 |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | 9 - 11 |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | |
| total | 34 - 34 |
| Attributes | no striking attributes |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | 10 - 10 |
| Adipose fin |
| Attributes | forked |
| Fins number | |
| Spines total | |
| Soft-rays total | 21 - 24 |
| Pectoral | Attributes more or less normal |
| Spines | |
| Soft-rays 12 - 12 | |
| Pelvics | Attributes more or less normal |
| Position abdominal before origin of D1 | |
| Spines | |
| Soft-rays |