Insecta - Diptera - Bibionidae

Full reference: S. E. Lewis. 1971. Three new species of fossil Diptera (Bibionidae) from the Ruby River Basin (Oligocene) of Southwestern Montana. Annals of the Entomological Society of America 64(6):1464-1466

Belongs to Penthetria according to S. E. Lewis 1971

Sister taxa: Penthetria abacula, Penthetria alderensis, Penthetria beskonakensis, Penthetria bohemica, Penthetria brevipennis, Penthetria bucklandi, Penthetria creedensis, Penthetria elegans, Penthetria fryi, Penthetria gracilis, Penthetria inflata, Penthetria intermedia, Penthetria lapidaria, Penthetria livida, Penthetria longa, Penthetria longifurca, Penthetria lugens, Penthetria lygaeoides, Penthetria marinosi, Penthetria whipsawensis

Type specimen: John Wulf coll. 6-24, a wing (missing apex and base). Its type locality is Ruby River Site 6, which is in an Oligocene lacustrine shale in Montana.

Ecology:

Average measurements (in mm): wing 7.30 x 2.00