Eurhinosaurus longirostris (Abel 1909, Early Jurassic, Sinemurian - Toarcian, 6m) Derived from a sister to Leptonectes, Eurhinosaurus was larger, more gracile, had a smaller skull and larger tail and fins. The mandible was much smaller than the rostrum. The tooth length was patterned in three lengths.
Leptonectes tenuirostris (Conybeare 1822, Late Triassic to Early Jurassic) was a 'standard' ichthyosaur with a large skull and shorter fins. Notably the temporal bones wrapped around the back of the skull.