• 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)