[1] Both species of Cyllonium were first described by the English entomologist John Obadiah Westwood.

The fossils were recovered from the Early Cretaceous (Berriasian age) of the Lower Purbeck formation, Durdlestone Bay, England.

They were originally identified to be butterflies, but this is now generally not accepted.

[3] They have been tentatively identified as possible palaeontinids (extinct giant cicadas) in 1961.

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