Perennibranchiate

Perennibranchiate is a special word used in zoology to describe animals that keep their gills throughout their whole lives. Most animals that have gills lose them when they grow up, but perennibranchiate animals do not. This condition is most commonly seen in certain types of amphibians, which are animals that live both in water and on land.

One well-known example of a perennibranchiate animal is the mudpuppy, which keeps its gills even as an adult. In some groups of amphibians, only a few individuals keep their gills as adults, but in others, most do. For instance, in some populations of the Rough-skinned Newt found in the Cascade Mountains, about ninety percent of the adult newts keep their gills.

The term perennibranchiate is used to contrast with caducibranchiate, which describes animals that lose their gills as they mature. Studying perennibranchiate animals helps scientists understand more about how different species adapt and survive in their environments.