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

References

Strophomenata

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