Systematic revision of Sarcosuchus hartti (Crocodyliformes) from the Reconcavo Basin (Early Cretaceous) of Bahia, north-eastern Brazil

摘要

Sarcosuchus hartii was a top predator that inhabited the fluvial and coastal areas of north-eastern Brazil during the Early Cretaceous. Several fossil remains were recovered during the late 19th and early 20th centuries from strata that outcrop in the Reconcavo Basin in the state of Bahia. A re-analysis of this material shows that S. hartii is a valid species. The Brazilian taxon differs from the African Sarcosuchus imperator in the unique pattern of anastomosing ornamentation observed on the enamel surface. The inclusion of S. hartii in a novel phylogenetic analysis recovered it inside Tethysuchia, a large clade comprising South and North American pholidosaurids along Elosuchidae and Dyrosauridae. The evolutionary origin of Sarcosuchus is likely related to a cladogenesis event that resulted from the break-up of Gondwana.