There are rudists in Brazil! Derived examples of cf. Amphitriscoelus Harris and Hodson, 1922, in the Araripe Basin, north-east Brazil: Implications for dating of the fossil Lagerstätten of the Santana and Crato formations

Internal moulds of rudist bivalves from the basal Exu Formation western Araripe Basin, northeastern Brazil, are identified as Early Cretaceous (Barremian to Aptian) radiolitidin caprinuloideid genus cf. Amphitriscoelus Harris and Hodson. The rudists occur part a sparse assemblage remané fossils in Formation, fluvial sandstone resting disconformably on Santana Group likely have been derived shallow marine upper parts that formation. presence suggests underlying can be no younger than lower Aptian. These first found Brazil furthest south occurrence rudists, confirming suspected faunal links for Basin with Caribbean province Tethyan realm.