Billingsellida

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

References