Cirsochilus washingtonianus Effinger, 1938 † (original description)
Cypraeogemmula warnerae Effinger, 1938 † (original description)
Glycymeris winlockensis Effinger, 1938 † (original description)
Liotia weaveri Effinger, 1938 † (original description)
Loxocardium etheringtoni Effinger, 1938 † (original description)
Molopophorus Gabb, 1869 † (basis of record)
Molopophorus bramkampi Effinger, 1938 † (original description)
Mya (Antiguamya) Effinger, 1938 † (original description)
Odostomia griesensis Effinger, 1938 † (original description)
Ostrea griesensis Effinger, 1938 † (original description)
Scaphander washingtonensis C. E. Weaver, 1916 † (basis of record)
Scaphander washingtonensis goodspeedi Effinger, 1938 † (original description)
Tellina gibsonensis Van Winkle, 1918 † (additional source)
Trichotropis alienensis Effinger, 1938 † (original description)
Volvulella tabori Effinger, 1938 † (original description)