|Common musk turtle a species of the Kinosternoidea superfamily|
Joyce, Parham, and Gauthier 2004
These are nowadays usually considered independent families of the Trionychia, among which they represent very plesiomorphic members which share a few peculiarly advanced traits. These apomorphies coupled with the overall "primitiveness" was what misled scientists as to their actual relationships.
- Dermatemydidae family
- Dermatemys genus
- Baptemys genus
- Kinosternidae family
- Kinosterninae subfamily
The entirely unrelated big-headed turtle (Platysternon megacephalum) was previously included in classification.
- Rhodin, Anders G.J.; van Dijk, Peter Paul; Inverson, John B.; Shaffer, H. Bradley; Roger, Bour (2011-12-31). "Turtles of the world, 2011 update: Annotated checklist of taxonomy, synonymy, distribution and conservation status". Chelonian Research Monographs. 5. Archived from the original (PDF) on 2012-01-22.