Kauai
Guides
Apterocyclus
Kauai flightless stag beetles
Apterocyclus is a genus of flightless stag beetles endemic to the Hawaiian island of Kauai. The genus comprises five described species, ranging from 14 to 23 mm in length. These beetles represent the only native scarabaeoid beetles in the Hawaiian Islands. Three species (A. honoluluensis, A. kawaii, and A. waterhousei) have been confirmed living since the late 1960s, while others may be extinct. Historical collection data shows a dramatic decline, with over 130 specimens documented between 1871 and 1922 but very few found in recent decades.
Apterocyclus honoluluensis
Kauai Flightless Stag Beetle
Apterocyclus honoluluensis, the Kauai flightless stag beetle, is a flightless stag beetle endemic to the Hawaiian island of Kauai. It is the smallest and most commonly encountered species in its genus, with adults measuring 14–17 mm, rarely reaching 21 mm. The species has declined due to predation by introduced mice and habitat loss, and was considered for protection under the U.S. Endangered Species Act in 1994 but was declined due to insufficient data.
Apterocyclus munroi
Apterocyclus munroi is a species of stag beetle in the family Lucanidae. The species was described from four specimens collected on Kauai, Hawaii in 1897. No confirmed observations have been made since the original collection, and the species is considered possibly extinct. It belongs to a genus of flightless stag beetles endemic to the Hawaiian Islands.
Apterocyclus waterhousei
Apterocyclus waterhousei is a rare, flightless stag beetle endemic to the Hawaiian island of Kauai. It belongs to a genus of flightless beetles found only in the Hawaiian Islands. The species has been documented in several locations on Kauai in recent years.