The first larva of the cucujiform superfamily Cleroidea from the Mesozoic and its ecological implications (Coleoptera)

Abstract

A larva of Cleroidea in Burmese amber is described, which is the first record of an immature beetle of the basal cucujiform superfamily for the Mesozoic. Well-preserved unique specimen is described and illustrated using traditional methods as well as synchrotron-radiation-based micro-computed tomography (SRµCT) to reconstruct the specimen and discern integumental details of cephalic structures, especially the mouthparts. Cretorhadalus constantini gen. et sp. nov. is unambiguously assigned to the melyrid lineage of Cleroidea and tentatively classified within the basal family Rhadalidae. Within this family, this fossil larva has the ancestral cleroid pattern of the stemmata (2+3) and well-developed hooked urogomphi. Based on a comparison with extant rhadalids, as well as most members of the melyrid lineage, the larvae and adults of this new species were probably carnivorous, living on the trunks and branches of trees or in galleries where they foraged for soft xylophagous insects.