Insecta - Diptera - Bibionidae

Alternative combinations: Hesperinus immutabilis, Plecia immutabilis

Full reference: A. L. Melander. 1949. A Report on Some Miocene Diptera from Florissant, Colorado. American Museum Novitates 1407:1-61

Belongs to Penthetria according to J. Skartveit 2009

See also Fitzgerald 1999 and Melander 1949

Sister taxa: Bibio alacris, Bibio gigas, Bibio macer, Bibio minor, Penthetria abacula, Penthetria aestimata, Penthetria alderensis, Penthetria amoena, Penthetria anthracina, Penthetria beskonakensis, Penthetria blanchardi, Penthetria bohemica, Penthetria brevicollis, Penthetria carbonum, Penthetria cimicoides, Penthetria claripennis, Penthetria creedensis, Penthetria egerana, Penthetria elongatipennis, Penthetria fryi, Penthetria fuchsi, Penthetria gigantea, Penthetria globularis, Penthetria gracilis, Penthetria graciliventris, Penthetria imperialis, Penthetria incerta, Penthetria integroneura, Penthetria intermedia, Penthetria longa, Penthetria longifurca, Penthetria longiventris, Penthetria luberonica, Penthetria lugens, Penthetria montanaregis, Penthetria murchisonii, Penthetria nervisinuata, Penthetria nigra, Penthetria parschlugiana, Penthetria rubescens, Penthetria rubiensis, Penthetria subterranea, Penthetria togoensis, Penthetria tropica, Penthetria velutina, Penthetria whipsawensis, Bibiopsis funebris, Bibiopsis murchisonii, Protomyia grossa, Protomyia matheroni, Protomyia stygia

Type specimen: USNM 112554, an exoskeleton. Its type locality is Florissant (USNM Collection), which is in a Chadronian lacustrine - large shale in the Florissant Formation of Colorado.

Distribution: found only at Florissant (USNM Collection)

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Specimen images are retrieved through the ePANDDA API.