| Main Ref. | Marceniuk, A.P., A.P. Acero, R. Cooke and R. Betancur-R, 2017 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks | Females have well-developed fleshy protuberances or pads in basal portion of pelvics, especially during reproductive season; vomerine tooth patches and accessory tooth patches not observed directly, but possibly showing same variation described for A. canteri and A. jimenezi. |
| Striking features | |
| Body shape lateral (shape guide) | |
| Cross section | oval |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | |
| Type of scales | |
| Diagnosis |
This species is distinguished from its congeners by the following characters: gill rakers on the first gill arch 19-20; first and second gill arches with 40–42 rakers; osseous medial groove present; fleshy medial groove of neurocranium conspicuous and very long, always surpassing the posterior margin of eyes; lateral margin of sphenotic notched, narrower medially than anteriorly; pterotic lateral margin markedly convex, sometimes angled; mouth small 10.7-12.3% SL; anterior nostrils close 5.5-6.5% SL; posterior nostrils close 4.9-6.7% SL; cephalic shield narrower in the frontal area 8.3-9.8% SL; mesethmoid median portion narrow, mesethmoid medial notch narrow and deep; external posterior branch of lateral ethmoid columnar and thin (Ref. 116660). |
| Ease of Identification |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | |
| Pored lateral line scales | |
| Scales in lateral series | |
| Scale rows above lateral line | |
| Scale rows below lateral line | |
| Scales around caudal peduncle | |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | |
| total |
| Attributes | |
| Fins number | |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | |
| Adipose fin |
| Attributes |
| Fins number | |
| Spines total | |
| Soft-rays total |
| Pectoral | Attributes |
| Spines | |
| Soft-rays | |
| Pelvics | Attributes |
| Position | |
| Spines | |
| Soft-rays |