Cyllonium is a genus of extinct insects. It contains two species. Both species of Cyllonium were first described by the English entomologist John Obadiah...

Tindale, 1980 (Queensland, Mid-Triassic) †Cyllonium Westwood, 1854 †Cyllonium boidusvalianum Westwood, 1854 †Cyllonium hewitsonianum Westwood, 1854 †Eoses Tindale...

†Yanocossus Ren, 1995 - Yixian Formation, Early Cretaceous, East Asia †Cyllonium Westwood, 1854 - Early Cretaceous, Western Europe (too poorly preserved)...