Mecodema moniliferum  Mecodema moniliferum is a medium-sized ground beetle endemic to the South island, New Zealand. This species is part of the monophyletic "curvidens" group and is found on the braided-river systems of the South Island. Distinguished from other "Mecodema" species by having:   Length 14.6–19.5 mm, pronotal width 4.2–6.2 mm, elytral width 5.1–7.1 mm. Colour of entire body matte reddish-brown to matte black. One of the three "Mecodema" species that is adapted to inhabiting the braided-river systems of Canterbury and Otago, South Island.