Compression fossil Mymaridae (Hymenoptera) from Kishenehn oil shales, with description of two new genera and review of Tertiary amber genera

Abstract

Compression fossils of three genera and six species of Mymaridae (Hymenoptera: Chalcidoidea) are described from 46 million year old Kishenehn oil shales in Montana, USA. Two new genera are described: Eoeustochus Huber, gen. n., with two included species, E. kishenehn Huber (type species) and E. borchersi Huber, sp. n., and Eoanaphes., gen. n., with E. stethynioides Huber, sp. n. Three new species of Gonatocerus are also described, G. greenwalti Huber, sp. n., G. kootenai Huber, sp. n., and G. rasnitsyni Huber, sp. n. Previously described amber fossil genera are discussed and five genera in Baltic amber are tentatively recorded as fossils: Anagroidea, Camptoptera, Dorya, Eustochus, and Mimalaptus.