Cretodineutus rotundus gen. et sp. nov., the oldest adult whirligig beetle from the Upper Cretaceous of Myanmar (Coleoptera, Gyrinidae, Gyrininae)

Abstract A fossil whirligig beetle Cretodineutus rotundus gen. et sp. nov. is described from Late Cretaceous Burmese amber. Cretodineutus resembles the extant genus Dineutus and is assigned to the subfamily Gyrininae, tribe Dineutini. Cretodineutus is the oldest known adult fossil whirligig beetle of the subfamily Gyrininae. The new species is described in detail, and photographs and illustrations are provided.