in taxon polyplacophoran black katy chiton Katharina tunicata (Wood, 1815) is commonly known as the Black Katy chiton, Black Leather chiton, Black chiton, or Leather chiton. Capable of growing up to 12 cm, the animal is generally described as being football-shaped with a black leathery girdle in which are embedded eight protective plates. The parts of the plates that are visible are sometimes (but not always) diamond-shaped in outline. The underside of the animal is dull orange or yellow. black chiton black chiton black leather chiton gumboots katharina tunicata leather chiton leathery chiton Katharina tunicata requires discussion