Subfamily Pachylostictinae Benson 1938 (cimbicid sawfly)
Insecta - Hymenoptera - Cimbicidae
Full reference: R. B. Benson. 1938. On the classification of sawflies (Hymenoptera Symphyta). Transactions of the Royal Entomological Society of London 87:353-384
Parent taxon: Cimbicidae according to S. B. Archibald and A. P. Rasnitsyn 2023
See also Benson 1938 and Taeger et al. 2010
Sister taxa: Abiinae, Cenocimbicinae, Cimbicinae, Corynidinae
Subtaxa: Eopachylosticta
Ecology:
Distribution: found only at East Alkali Gulch head, south of De Beque (Eocene of Colorado)