Katharina tunicata (Wood, 1815) is commonly known as the black Katy chiton, black Leather chiton, black chiton, or leather chiton, (Kasuqix in the indigenous Aleut language), is a species of chiton in the family Mopaliidae.

Katharina tunicata. Retrieved May, 22 2023, from en.wikipedia.org/wiki/Katharina_tunicata.