This is a reptile of the same family as protorosaurus, the size of the green iguana, but it had no current descendant.This reptile that usually eats fish, amphibian and insect but he happens annually, this gathering in groups to raid the nesting site of horseshoe crabs (As pterosaurs Rhamphorhynchus later in the Jurassic).However, they are at the bottom of the food chain predator being the favorite prey of his time: Ticinosuchus. Macrocnemus did a show in the French documentary "Sur la trace des premiers sauriens".