| Main Ref. | Zawadzki, C.H., L.F.C. Tencatt and O. Froehlich, 2014 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral (shape guide) | elongated |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | |
| Type of scales | |
| Diagnosis |
Hypostomus perdido can be diagnosed from all congeners, except H. fonchii, by having unicuspid teeth (vs. bicuspid teeth). It differs from H. fonchii by having the following characters: 26-27 dermal plates in the median series of lateral plates (vs. 28); 7-10 premaxillary teeth (vs. 18-21); 8-13 dentary teeth (vs. 18-25); more depressed head, head depth 15.8-18.1% in SL (vs. 19.1-22.0%); and median buccal papilla present (vs. absent) (Ref. 95502). |
| 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 | 27 - 27 |
| Attributes | |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 2 - 2 |
| Soft-rays total | 7 - 7 |
| Adipose fin | present |
| Attributes | more or less truncate |
| Fins number | |
| Spines total | 1 - 1 |
| Soft-rays total | 5 - 5 |
| Pectoral | Attributes |
| Spines 1 | |
| Soft-rays 6 - 6 | |
| Pelvics | Attributes |
| Position abdominal before origin of D1 | |
| Spines 1 | |
| Soft-rays 5 - 5 |