It's either a South American or African lungfish (they look very similar), but I thought it might have been an African because it looked pretty scaley and muscular, and its "legs" were very long and more developed than pictures I'd seen of the South Americans. Does anyone know which it might have been?
 Which is actually a pretty good flick, in that cheesy 50's horror-movie way. One of the things I liked about it was that the female lead didn't just stand around and scream (although she did a bit of that, but in situations where you'd be screaming, too). She was smart, witty, level-headed, and did stuff besides look really great in a swimsuit.