It is distinguished from other North IslandMecodema species by having the vertexal groove defined by rugosewrinkles and punctures along the entire groove; 8-10 setae along each side of the pronotum carina; the base of the pronotum has numerous light punctures between the pronotal foveae; plus, the distinctive shape of the apical portion of the penis lobe.
Description
It has a length of 26.6–32 mm, pronotal width of 7.3–9.1 mm, and elytral width of 8.4–10.3 mm. Colour of head and pronotum matte to glossy black, abdomen and elytra matte dark reddish-brown to black; coxae and legs dark reddish-brown.