The films really went through cycles, in the 1950s it was all about the Atomic age monstrosities beginning with THEM!, then it was cheapie knockoffs of The Birds (or nature gone mad/revenge of mother nature), and continued with knockoffs of Jaws (rogue freaks of nature).
Here are a few more:
The Crater Lake Monster (1977)
Deadly Eyes (1982)
Technically Beast From 20,000 Fathoms is the first atomic monstrosity, although Them is the first giant mutant movie.
I'm surprised you didn't remember Tentacles. It was a fairly regular movie of the week showing. Started out pretty good, especially with that creepy music riff every time the thing showed up but it really bogged down toward the end.
Would you include Day Of The Dolphin in the genera or not? It sort of fits in with the Jaws era but it's not so much an animals attack movie as a strap a bomb on the animal and turn it loose one.