Species: chapmanae PEREZ-GARCIA, 2023
Etymology: In honor of the Dr. Sandra Chapman, the former curator of the Natural history Museum (MHMUK) vertebrate palaeontology collection where the holotype of this new species is dopostied.
Holotype: NHMUK R37356
Locality: Indamane Mount area (also called Igdaman Mount), Abalak Department, Tahoua Region, Iullemmeden Basin, Southwestern Nigeria.
Horizon: Farin-Doutchi Formation ("Mosasaurus Shales").
Biostratigraphy:
Age: Upper Maastrichtian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: An almost complete and articulated shell, lackign teh most anterior area of the plastron.