Type species. Turbo bianor d’Orbigny, 1850. Port-en-Bessin, Normandy, France; Bajocian (Middle Jurassic).
Remarks. The taxon Eucycloidea was described by Huddleston (1888) as a subgenus of Purpurina (family Purpurinidae) and subsequently transferred by Gründel (1973) to the mathildids. Subsequently Gründel (1997) investigated d’Orbigny’s (1850) type species material and re-interpreted the genus as an eucyclid. This attribution has been accepted by subsequent authors (e.g. Bandel 2010).