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Hyotissa, honeycomb oysters
Hyotissa hyotis - Kyoto University Museum - DSC06407.JPG
Three shells of Hyotissa hyotis
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Ostreoida
Family: Gryphaeidae
Genus: Hyotissa

Hyotissa is a genus of large saltwater oysters, marine bivalve mollusks. Species in this genus are known as honeycomb oysters, or "foam oysters" because under magnification, their shell structure is foam-like.