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Genus: Alastega Cherns , 1998 † (DB: 2 SP)
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Alastega lira
Cherns, 1998 † (FOSSIL)
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Alastega martini
Hoare & Pojeta Jr., 2006 † (FOSSIL)
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Genus: Amblytochiton Hoare & Pojeta, Jr., 2006 † (DB: 1 SP)
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Amblytochiton incomptus
Hoare & Pojeta Jr., 2006 † (FOSSIL)
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Genus: Thairoplax Cherns , 1998 † (DB: 3 SP)
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Thairoplax birhombivalvis
(J.R.M. Bergenhayn, 1955 †) (FOSSIL)
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Thairoplax merriami
Hoare, 2000 † (FOSSIL)
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Thairoplax pelta
Cherns, 1998 † (FOSSIL)
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