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Billingsellida
An order of brachiopods containing the families:Suborder Billingsellidina
Superfamily Billingselloidea
Family Billingsellidae
Suborder Clitambonitidina
Superfamily Clitambonitoidea
Family Clitambonitidae
Family Gonambonitidae
Superfamily Polytoechioidea
Family Polytoechiidae