Potentially-extinct
Guides
Apterocyclus palmatus
Apterocyclus palmatus is a species of stag beetle endemic to the island of Kauai in the Hawaiian Islands. It was originally described in 1922 as a subspecies of Apterocyclus honoluluensis, but is now recognized as a distinct species. The species is known from only five specimens collected in 1919 at 4,000 feet elevation. No specimens have been found in recent decades, and the species may be extinct.