1. THE acorn barnacle is a small, shelled creature that lives in water.

2. The most common type is known as an “acorn barnacle,” which has no stalk; however, some other shelled Barnacles attach themselves with a stalk.

3. Barnacle definition, any marine crustacean of the subclass Cirripedia, usually having a calcareous shell, being either stalked (goose Barnacle ) and attaching itself to ship bottoms and floating timber, or stalkless (rock Barnacle, or acorn Barnacle ) and attaching itself …

4. Whale Barnacles are species of acorn barnacle that belong to the subfamily Coronulinae, family Coronulidae.They typically attach to baleen whales, and sometimes settle on toothed whales.The whale Barnacles diverged from the turtle Barnacles about three million years ago.