Metriorhynchids were fully aquatic crocodyliforms with reduced forelimbs, no osteoderms, and shark-like tail flukes for propelling themselves through the depths. Plesiosuchus, at an estimated 6.8 m long, is the largest known member of the family. Like its very distant relative the modern saltwater crocodile, this Jurassic predator probably fed on whatever it could catch, from various fish to other marine reptiles.