Billingsellida
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Billingsellida is 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