considered to be stem groups of a previously categorized Upupiformes order prior to it being subcategorized into Bucerotiformes.

Taxonomy

Order Bucerotiformes
*Family Messelirrisoridae
**Genus Messelirrisor
*** Messelirrisor halcyrostris
*** Messelirrisor grandis
*** Messelirrisor parvus
*Family Laurillardiidae