1) Fish 
Halosauropsis Halosaurus †``Laytonia The term `halosaur` refers to the type genus, Halosaurus, which is a Greek compound word, hals meaning `sea` and sauros meaning `lizard`. Halosaurs have a spotty fossil record, the oldest known genus being Echidnocephalus from the Late Cretaceous strata of Westphalia, Germany, and the second-oldest kn...