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- ›Rain Beetles
Rain Beetles
Pleocoma
Pleocoma is the only extant genus of rain beetles (family Pleocomidae) and is endemic to the Pacific states of North America. Fossil remains of Pleocoma have been found in the Yixian Formation in China, suggesting beetles in this genus have existed in something like their present form since at least the Cretaceous period. There are 27 described species in Pleocoma.
Possessing a robust oval body form similar to other scarabaeiforms, their ventral side is densely covered with fine, long hairs (genus name derives from Greek πλείων (ple-, abundant) and κόμη (kome, hair), extending to the legs and to the margins of thorax and elytra. The back is hairless and glossy. Overall colors range from black to a reddish-brown, while the hairs may range from yellow to red to black. The antennae are 11-segmented, with a club of four to eight lamellae, more than in any other group of the Scarabaeoidea. The mandibles are not functional, and the opening into the esophagus is closed off; adults do not eat.
28 branches of this genus, most-observed first
Pleocoma behrensi
speciesPleocoma behrensi
Pleocoma dubitabilis
speciesPleocoma dubitabilis
Fimbriate Rain Beetle
speciesPleocoma fimbriata
Southern Rain Beetle
speciesPleocoma australis
Black Rain Beetle
speciesPleocoma puncticollis
Santa Cruz Rain Beetle
speciesPleocoma conjungens
Pleocoma simi
speciesPleocoma simi
Pleocoma staff
speciesPleocoma staff
Pleocoma badia
speciesPleocoma badia
Pleocoma tularensis
speciesPleocoma tularensis
Hopping's Rain Beetle
speciesPleocoma hoppingi
Pleocoma rickseckeri
speciesPleocoma rickseckeri
Pleocoma sonomae
speciesPleocoma sonomae
Pleocoma crinita
speciesPleocoma crinita
Pleocoma bicolor
speciesPleocoma bicolor
Pleocoma hirticollis
speciesPleocoma hirticollis
Sierran Rain Beetle
speciesPleocoma rubiginosa
Pleocoma callisto
speciesPleocoma callisto
Pleocoma laker
speciesPleocoma laker
Pleocoma hovorei
speciesPleocoma hovorei
Pleocoma octopagina
speciesPleocoma octopagina
Pleocoma linsleyi
speciesPleocoma linsleyi
Pleocoma blaisdelli
speciesPleocoma blaisdelli
Pleocoma minor
speciesPleocoma minor
Pleocoma oregonensis
speciesPleocoma oregonensis
Pleocoma shastensis
speciesPleocoma shastensis
Pleocoma marquai
speciesPleocoma marquai
Pleocoma carinata
speciesPleocoma carinata
Where it lives
Recorded sightings
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geo-referenced records in GBIF, from museums, herbaria and field observers.
Drag the globe to turn it. Dots are where records exist, not a range map; darker means more records.
In the stacks
Searching the stacks…
Every page naming Pleocoma in the Biodiversity Heritage Library →
This page is assembled live from iNaturalist, GBIF, Wikipedia, the Source Library and the Internet Archive. It is not yet part of the hand-edited codex. iNaturalist taxon 176065.