An order of brachiopods containing the families:^[1]

• Suborder Billingsellidina
  • Superfamily Billingselloidea
    • Family Billingsellidae
• Suborder Clitambonitidina
  • Superfamily Clitambonitoidea
    • Family Clitambonitidae
    • Family Gonambonitidae
  • Superfamily Polytoechioidea
    • Family Polytoechiidae

Billingsellida
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Brachiopoda
Class:	†Strophomenata
Order:	†Billingsellida References edit ^ Williams, Alwyn; Brunton, C.H.C.; Carlson, S.J.; et al. (1997–2007). Kaesler, Roger L.; Selden, Paul (eds.). Part H, Brachiopoda (Revised). Treatise on Invertebrate Paleontology. Boulder, Colorado; Lawrence, Kansas: Geological Society of America; University of Kansas.