| Common name | João duro |
| Language | Portuguese |
| Dialect | Unknown |
| Type | Vernacular |
| Official trade name | No |
| Rank | 3 - (Other common name) |
| Country | Brazil |
| Locality | |
| Ref. | Begossi, A. and J.C. Garavello, 1990 |
| Life stage | juveniles and adults |
| Sex | females and males |
| Core | person (generic) |
| 1st modifier | morphology |
| 2nd modifier | |
| Remarks | João = very common person name in Brazil + duro = hard |