Authors(s)	Barros, R. B., M. M. Sampaio, M. F. Assis, M. Ayres, and O. Cunha.
Year	1976
Title	General consideration on the karyotype evolution of Chelonia from the Amazon Region of Brazil. Cytologia 41: 559-565.

• Chelus fimbriatus
• Phrynops gibbus
• Platemys platycephala