''Apterocyclus palmatus'' is a species of

stag beetle Stag beetles are a family of about 1,200 species of beetles in the family Lucanidae, currently classified in four subfamilies.Smith, A.B.T. (2006). A review of the family-group names for the superfamily Scarabaeoidea (Coleoptera) with corrections ...

in the family

Lucanidae Stag beetles are a family of about 1,200 species of beetles in the family Lucanidae, currently classified in four subfamilies.Smith, A.B.T. (2006). A review of the family-group names for the superfamily Scarabaeoidea (Coleoptera) with corrections ...

. It is found on the island of

Kauai Kauai, () anglicized as Kauai ( ), is geologically the second-oldest of the main Hawaiian Islands (after Niʻihau). With an area of 562.3 square miles (1,456.4 km2), it is the fourth-largest of these islands and the 21st largest island ...

in the

Hawaiian Islands The Hawaiian Islands ( haw, Nā Mokupuni o Hawai‘i) are an archipelago of eight major islands, several atolls, and numerous smaller islets in the North Pacific Ocean, extending some from the island of Hawaii in the south to northernmost Kur ...

. Five specimens of ''Apterocyclus palmatus'' were found on the island of

in the

in 1919, at an elevation of 4,000 feet. They were originally described as a subspecies of ''

Apterocyclus honoluluensis ''Apterocyclus honoluluensis'', the Kauai flightless stag beetle, is a species of stag beetle in the family Lucanidae. It is found on the island of Kauai in the Hawaiian Islands. ''Apterocyclus honoluluensis'' is historically and currently the ...

'', but are now considered a separate species. No specimens have recently been discovered, and the species may now be extinct. ''Apterocyclus palmatus'' are 22–23 mm in length, and are identified by their long

mandibles In anatomy, the mandible, lower jaw or jawbone is the largest, strongest and lowest bone in the human facial skeleton. It forms the lower jaw and holds the lower tooth, teeth in place. The mandible sits beneath the maxilla. It is the only movabl ...

that have no internal teeth, and the distinctive shape of their front

tibia The tibia (; ), also known as the shinbone or shankbone, is the larger, stronger, and anterior (frontal) of the two bones in the leg below the knee in vertebrates (the other being the fibula, behind and to the outside of the tibia); it connects ...

References

External links

* Lucaninae Beetles of Oceania Insects of Hawaii Endemic fauna of Hawaii Beetles described in 1921 {{lucanidae-stub

References

Further reading

External links