[1] Along with other well preserved insect fossils, the E. biesmeijeri specimen was collected from layers of the Middle Eocene Parachute Creek Member of the Green River Formation.

Study of the paleoflora preserved in the shales indicates the lake was around 1,500–2,900 metres (4,900–9,500 ft) in elevation surrounded by a tropical to subtropical environment that had a distinct dry season.

[1] At the time of study, the holotype was part of the Division of Entomology (Paleoentomology) collections, University of Kansas Natural History Museum.

The specific epithet biesmeijeri was coined as a patronym honoring the Belgian melittologist Jacobus Biesmeijer, who is a noted researcher of pollinator-plant interactions and pollinator declines.

[1] E. biesmeijeri is one of four bee species described by Dehon and team in the PLOS ONE article, the others being Andrena antoinei, Bombus cerdanyensis, and Protohabropoda pauli.