We are not sure of this classification of this bivalve but just had to use this image that Ryan took at Race Rocks, as it shows association with two other classes of Molluscs, the chitons and the gastropods.
Here is a possible classification from ITIS Report
Animalia: – animals
Subkingdom: Bilateria
Infrakingdom: Protostomia
Superphylum: Lophozoa
Phylum: Mollusca
Class: Bivalvia
Subclass: Heterodonta
Order: Veneroida
Superfamily: Tellinoidea
Family: Tellinidae
Genus: Macoma (Leach,) 1819
Species: Macoma brota Dall, 1916 – heavy macoma
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