In 1998 Rieppel synonymised Lariosaurus, Silvestrosaurus and Ceresiosaurus, but this is disputed by many authors and they are usually considered close relatives.

This would have made it a relatively poor swimmer, and it is presumed to have spent much time on dry land, or hunting in shallows.

[3] Further, based on skeletal findings of immature lariosaurs inside the adults, Lariosaurus is believed by many to be viviparous, or able to bear live young.

Another Lariosaurus skeleton was found with two juvenile placodonts of the genus Cyamodus in its stomach, giving an indication of its diet.

In 2014 a skull was found in the Winterswijk Muschekalk quarry, of what appeared to be a new species, that was named Lariosaurus vosseveldensis.

Loch Ness mocking Lariosaurus sightings are often reported on the newspapers of the Lake Como area.