Mecodema moniliferum is a medium-sized ground beetle endemic to the South island, New Zealand.

[1] This species is part of the monophyletic curvidens group and is found on the braided-river systems of the South Island.

[2] 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.

[2] One of the three Mecodema species that is adapted to inhabiting the braided-river systems of Canterbury and Otago, South Island.