| Main Ref. | Arcila, D., R.P. Vari and N.A. Menezes, 2013 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks | Mature males have hooks on anal-, pelvic-, and caudal-fin rays (vs. absent in mature females). |
| Striking features | |
| Body shape lateral | elongated |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | terminal |
| Diagnosis |
Acrobrycon ipanquianus differs from A. starnesi by having 51-60 perforated lateral-line scales (vs. 61-66), 19-21 horizontal scales rows around the caudal peduncle (vs. 22-26), depth of the body at the dorsal-fin origin 49.0-51.2% of SL (vs. 25.8-31.0%), horizontal diameter of the eye 20.2-29.8% of HL (vs. 30.4-36.5% HL), and interorbital width 29.1-40.2% of HL (vs. 24.6-29.8% HL). It can be diagnosed from A. ortii by having the following characters: 23-27 branched anal-fin rays (vs. 19-21); body depth at the dorsal-fin origin 49.0-51.2% SL (vs. 22.8-37.4%); depth at the dorsal-fin origin relative to the horizontal eye diameter 390-820% (vs. 260-380%); horizontal eye diameter relative to the interorbital width 100-180% (vs. 80-90%); and caudal-peduncle length relative to the body depth at the dorsal-fin origin 240-440% (vs. 160-230%) (Ref. 94771). Description: dorsal-fin rays ii, 8; anal-fin rays ii- iii, 23-27; pectoral-fin rays i, 9-11; pelvic-fin rays i, 6-7 (Ref. 94771). |
| Ease of Identification |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | 51 - 60 |
| Pored lateral line scales | 51 - 60 |
| Scales in lateral series | |
| Scale rows above lateral line | |
| Scale rows below lateral line | |
| Scales around caudal peduncle | 19 - 21 |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | |
| total |
| Attributes | no striking attributes |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | 10 - 10 |
| Adipose fin | present |
| Attributes | forked |
| Fins number | |
| Spines total | |
| Soft-rays total |
| Pectoral | Attributes more or less normal |
| Spines | |
| Soft-rays 10 - 12 | |
| Pelvics | Attributes more or less normal |
| Position abdominal before origin of D1 | |
| Spines | |
| Soft-rays 7 - 8 |