''Calyptapis'' is an extinct bombini genus related to

bumblebee A bumblebee (or bumble bee, bumble-bee, or humble-bee) is any of over 250 species in the genus ''Bombus'', part of Apidae, one of the bee families. This genus is the only Extant taxon, extant group in the tribe Bombini, though a few extinct r ...

s with one described species ''Calyptapis florissantensis''. It is known only from the

Late Eocene The Priabonian is, in the International Commission on Stratigraphy, ICS's geologic timescale, the latest age (geology), age or the upper stage (stratigraphy), stage of the Eocene epoch (geology), Epoch or series (stratigraphy), Series. It spans ...

Chadronian age

shale Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of Clay mineral, clay minerals (hydrous aluminium phyllosilicates, e.g., Kaolinite, kaolin, aluminium, Al2Silicon, Si2Oxygen, O5(hydroxide, OH)4) and tiny f ...

s of the Florissant Formation in Colorado. The genus and species were described by Theodore Dru Alison Cockerell in 1906.

References

† Eocene insects of North America Fossil taxa described in 1906 Insects described in 1906 Fossil bee genera Monotypic prehistoric insect genera {{paleo-insect-stub