W

The Pteriida are an order of large and medium-sized marine bivalve mollusks. It includes five families, among them the Pteriidae.

W

Isognomon is a genus of marine bivalve mollusks which is related to the pearl oysters.

W

Isognomon alatus, the flat tree oyster, is a species of bivalve mollusc in the family Isognomonidae. It can be found along the Atlantic coast of North America, ranging from southern Florida to Brazil and Bermuda.

W

Isognomon californicum, the black purse shell or nahawele, is a species of Hawaiian bivalve in the family Isognomonidae. It was first formally named in 1837 by Timothy Abbott Conrad as Perla californica.

W

Isognomon radiatus, the radial purse oyster or Lister's tree oyster, is a species of bivalve mollusc in the family Isognomonidae. It can be found along the Atlantic coast of North America, ranging from southern Florida to Brazil and Bermuda.

W

Isognomonidae is a family of medium-sized to large saltwater clams. They are pearl oysters, marine bivalve molluscs in the superfamily Pterioidea

W

Naiadites is an extinct genus of thin-shelled non-marine bivalve from the Upper Carboniferous coal-measures of Nova Scotia in Canada.

W

The Pinnidae are a taxonomic family of large saltwater clams sometimes known as pen shells. They are marine bivalve molluscs in the order Pteriida.