Late 19th century; earliest use found in Proceedings of the Zoological Society of London. From scientific Latin Rhipidoglossa, former order name + -an.
Definition of rhipidoglossan in US English:
rhipidoglossan
adjectiveˌrɪpɪdəˈɡlɒsən
Zoology
= rhipidoglossate.
Origin
Late 19th century; earliest use found in Proceedings of the Zoological Society of London. From scientific Latin Rhipidoglossa, former order name + -an.