| Main Ref. | Malabarba, L.R. and J.K.F. Mahler Jr., 1998 |
| 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 |
Distinguished from M. parahybae and M. cibelae by the longer head (29.3-33.8% SL, versus 23.2-27.6 and 25.6-31.1 respectively) and wide body (28.5-33.9% SL versus 23.8-27.7 and 25.4-29.8, respectively). The smaller mouth width distinguish this species from M. eurystoma (50.6-64.3% HL, versus 67.3-84.4). |
| 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 | 3 - 7 |
| on upper limb | 2 - 3 |
| total | 5 - 10 |
| Vertebrae | |
| preanal | |
| total | 30 - 30 |
| Attributes | |
| Fins number | |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 1 - 1 |
| Soft-rays total | 6 - 6 |
| Adipose fin | present |
| Attributes | more or less truncate; more or less normal |
| Fins number | |
| Spines total | |
| Soft-rays total | 9 - 12 |
| Pectoral | Attributes |
| Spines 1 | |
| Soft-rays 5 - 6 | |
| Pelvics | Attributes |
| Position | |
| Spines | |
| Soft-rays 6 - 6 |