Necturus - from the New Latin Nect- to swim; and -urus having a tail

maculosus - from the Middle English word macul, meaning spots or blotches

A barking salamander?

Mudpuppies gain their name from the fact that they are one of the few salamanders who make noise! They don't actually bark like dogs as once thought, but they do squeak. The mudpuppy is a common salamander which never leaves the water. It was once thought that the mudpuppy was not active in the winter and buried itself in the mud, but it is now known to be active year-round.