Temporal range: Coniacian-Late Eocene (Casamayoran)
Madtsoia is an extinct genus of madtsoiid snakes. It is known from the Eocene (Casamayoran and Itaboraian) of Argentina (M. bai), the Paleocene of Brazil (M. camposi), the Late Cretaceous (Campanian) of Spain (M. laurasiae), the Late Cretaceous of India (M. pisdurensis), and the Late Cretaceous (Maastrichtian) of Madagascar and the Coniacian of Niger (M. madagascariensis). Recovered vertebrae of M. pisdurensis are 1.83 centimetres (0.72 in) long and 4.35 centimetres (1.71 in) tall) and pertain to a snake that was approximately 5 metres (16 ft) long.
Fossils of Madtsoia have been found in:
- Late Cretaceous
- Snakes: The Evolution of Mystery in Nature by Harry W. Greene
- In the Shadow of the Dinosaurs: Early Mesozoic Tetrapods by Nicholas C. Fraser and Hans-Dieter Sues
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