Classification of Squires 1983

Fm. Cymatiidae Iredale 1913
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G. Cymatium Röding 1798
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Subg. Cymatium (Septa) Perry 1810
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†Cymatium (Septa) janetae Squires 1983
G. Ranella Lamarck 1816
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†Ranella katherineae Squires 1983
Fm. Fasciolariidae Gray 1853
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G. Clavilithes Swainson 1840
Fm. Pinnidae Leach 1819
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G. Pinna Linnaeus 1758
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†Pinna llajasensis Squires 1983