Phillip Barden, Hollister W. Herhold & David A. Grimaldi, 2017, A new genus of hell ants from the Cretaceous (Hymenoptera: Formicidae: Haidomyrmecini) with a novel head structure, Systematic Entomology 42, pp. 837-846: 838

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http://doi.org/ 10.1111/syen.12253

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Haidoterminus  cippus McKellar, et al.

– the youngest known haidomyrmecine, H. cippus is described from a single worker specimen. This species extends the temoporal and geographic range of hell ants considerably, indicating that the specialized mouthparts and probable trap-jaw behaviour were evidently successful for some time and over a wide area of Laurasia. Haidoterminus  cippus is also unique among haidomyrmecines, possessing an elongate antennal scape somewhat similar to modern ant taxa.

Locality: Medicine Hat amber, ~ 78.5 Ma, Alberta, Canada ( McKellar et al., 2013)