Mandiblulu

Mandiblulu is a Neopteron Found in Swampy areas. This massive bug uses a labium, a lower set of mandibles set on a folded-inward, arm-like extension on a hair trigger, to catch and shovel prey into its mouth.

Description
Mandiblulu is a large, aquatic Neopteron, with compound eyes that glow a deep green color, 6 thick burrowing legs, a pair of spines which act as gills on its rear carapace, and a hardened, moss-green exoskeleton covered in root-like extensions to camouflage itself in its swampy home.

Behavior
It's often dormant, lying in wait for its main prey, Epioths, to swim by. When they do, its labium launches out and grab it, crushing its prey's shell, and bringing its meal back to its hungry, slicing mandibles, and is adequately consumed.