Classification of Marquez-Aliaga et al. 2010

Fm. Arcticidae Newton 1891
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G. †Isocyprina Röder 1882
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Subg. †Isocyprina (Eotrapezium) Douvillé 1912
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†Isocyprina concentrica Moore 1861
†Isocyprina ewaldi Bornemann 1854
Fm. †Bakevelliidae King 1850
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G. †Bakevellia King 1848
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Subg. †Bakevellia (Bakevelloides) Tokuyama 1959
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G. †Cuneigervillia Cox 1954
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†Cuneigervillia rhombica Cossmann 1904
Fm. †Ceratomyidae Arkell 1934
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G. †Pteromya Moore 1861
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†Pteromya crowcombeia Moore 1861
†Pteromya tatei Richardson and Tutcher 1916
Fm. Mytilidae Rafinesque 1815 [mussel]
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G. Modiolus Lamarck 1801
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†Modiolus minimus Sowerby 1818
Fm. Plicatulidae Watson 1930
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G. †Pseudoplacunopsis Bittner 1895
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†Pseudoplacunopsis alpina Winkler 1859