Atlantic Foam Oyster

Hyotissa mcgintyi, also known as Parahyotissa mcgintyi is a species of medium-sized saltwater "oyster", a marine bivalve mollusk in the family Gryphaeidae. This species occurs in the western Atlantic Ocean. Species in this genus are known as "honeycomb oysters" or "foam oysters" because under magnification, the majority of their shell structure is characteristically foam-like.