Paleocene lepidosaurs

Titanoboa (; ) is a genus of extinct giant boid snake (being the biological family of all boas and anacondas) that lived during the middle and late Paleocene epoch. Titanoboa was first discovered in the early 2000s by members of the Smithsonian Tropical Research Institute, which–along with students from the University of Florida–recovered 186 fossils of Titanoboa from the Cerrejón coal mines in the La Guajira department of northeastern Colombia. It was named and described in 2009 as Titanoboa cerrejonensis, and lauded as the largest snake ever found at that time. The original type

Madtsoia is an extinct genus of madtsoiid snakes. It is known from the Eocene of Argentina (M. bai), the Paleocene of Brazil (M. camposi), the Late Cretaceous (Maastrichtian) of India (M. pisdurensis), and the Late Cretaceous (Maastrichtian) of Madagascar (M. madagascariensis). The type species (M. bai) was the largest with an estimated length of , and the other three species were smaller. A long M. madagascariensis would have weighed , but an isolated specimen suggests that this species reached in maximum length. Juvenile Madtsoia madagascariensis may have eaten a wide array of small vertebra