page_title: Geodorcus ithaginis
section_title: Description
hierarchical_section_title: Geodorcus ithaginis / Description
caption_attribution_description: English: Pinned specimen of a Mokohinau stag beetle (Geodorcus ithaginis)
context_page_description: Geodorcus ithaginis, the Mokohinau stag beetle, is a large flightless species of stag beetle in the family Lucanidae. It was described by Thomas Broun in 1893 after being discovered in the Mokohinau Islands by Andreas Stewart Sandager, a lighthouse keeper on the islands. The species survives only on the small unnamed island "Stack H", in an patch of vegetation the size of a living room, and is in extreme danger of extinction.
context_section_description: Including their large mandibles (used for fighting over mates), male specimens range in length from 25.5 to 32.8 mm and are 10.4–12.4 mm wide. Females range in length from 20.0–22.5 mm. Their exoskeleton is black and ranges from dull to moderately glossy. The thorax is back, glossy, and wider than it is long. The elytra are rounded at the posterior, almost equally long and wide, and covered in short branching hairs. Male beetles have three teeth at the apex of the mandibles; females have two. What distinguishes this species from all other New Zealand stag beetles is a long conical vertical tooth, on the top of the mandible, in both sexes.
caption: Pinned specimen
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