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The first fossil remains that can definitely be ascribed to this genus were described in 1877 by paleontologist Othniel Charles Marsh
Most examples from these localities are sanded and polished to such an extent that the original aragonite shell is removed
Both wings are present
5 cm long and 1
nodosus ranges from the Didymoceras cheyennense through the Baculites cuneatus Range Zone and is found throughout the Western Interior Seaway
Eocene Green River Robber Fly IF-PCM-16-020 Pleistocene The first fossil remains thatRobber Fly aff. Stenocinclis sp. (Scudder) Green River Formation Parachute Creek Member Middle Eocene Uintah County, Utah This specimen shows the thorax, abdomen and head of a robber fly. The legs are also preserved but the wings are missing. The head has very good detail. The slab has two Tipula sp. on the back. The Asilidae are the robber fly family, also called assassin flies. They are powerfully built, bristly flies with a short, stout proboscis
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