Barnacle (slang) in the field in order to correct a design or manufacturing defect. The term appears to have originated from the crustacean barnacle which is an animal that attaches itself to rocks, docks, ships, whales, and other objects where it grows. A barnacle in electronics is something added to the manufactured product. Typically a barnacle on a circuit board is very noticeable, much like the mollusc variety on a rock in the sea. While the term was originally used with electronic hardware, it has also migrated into the software industry where is it is used to describe software that is added
Whale barnacle sirenians, and crabs–as a group specializing on baleen whales. Turtle barnacles are known from before the Early Tertiary which ended 23 million years ago (mya), and whale barnacles probably diverged in the Late Pliocene 3.5 to 3 mya. "Chelonibia testudinaria" turtle barnacle remains from the Pliocene of Italy seemed to have been associated with right whales ("Balaena" spp.), and could represent a transitional phase; the lack of competing barnacle species and the softer skin compared to the turtle carapace may have led to a divergence and a dispersal. Since whale barnacles are monophyletic, and the family contains a common ancestor