What is "messelirrisor"

The extinct Messelirrisoridae are a family of Bucerotiformes. Tiny hoopoe-like birds, they were among the predominant small forest birds of Central Europe during the Middle Eocene (some 49-37 mya). Fossilized remains of the single known genus Messelirrisor have been found in the Messel Pit ( Hesse, Germany). The Messelirrisoridae are the earliest representatives of the hoopoe/ wood-hoopoe lineage known at present.