Gharial
The fossil history of the Gavialoidea is quite well known. The earliest examples split from the other crocodilians in the late Cretaceous. The feature of the group that is easiest to recognise is the very long, narrow snout.  This is an adaptation to a diet of small fish. Gharials have sacrificed the great mechanical strength of the robust skull and jaw that most crocodiles and alligators have. For this reason,  and they cannot prey on large creatures. But they also have reduced weight and water resistance of their lighter skull and very narrow jaw. This gives gharials the ability to catch rapidly moving fish. They catch them with a side-to-side snapping motion.