Mecodema haunoho

Mecodema haunoho is the only ground beetle (Carabidae) species that is endemic to Little Barrier Island (Hauturu). It is sister species of the Great Barrier Island (Aotea) species M. aoteanoho and both are closely related to M. manaia, a species found in Bream Head, Northland, New Zealand.

Diagnosis
Distinguished from other North Island Mecodema species by having:


 * 1) the prothoracic carina narrow the entire length, moderately crenulated with 3 setae along each side (curvidens species group);
 * 2) the distinctive shape of the penis lobe.

Description
Length 20.5–24.1 mm, pronotal width 5.1–5.9 mm, elytral width 6.3–6.8 mm. Colour of the entire body is matte to glossy black.

Natural history
Found throughout the island, but more commonly encountered in the broadleaf forests of the southern and southwestern areas of Hauturu.