At one time, the fossil species Rimasuchus lloydi was thought to be the ancestor of the Nile crocodile, but more recent research has indicated that Rimasuchus, despite its very large size (about 20–30% bigger than a Nile crocodile with a skull length estimated up to 97 cms ), is more closely related to the dwarf crocodile (Osteolaemus tetraspis) among living species.