Sealurk

Sealurk's are plant creatures found in rivers, bogs, swamps and oceans. Their name derives from the fact they lurk in the shadows of the water and then snatch up any unsuspecting creatures. Sealurks grow from their spores underwater and sit underwater from there they grow moss from their bodies that have little grippers attached to it. When anything stands on it the Sealurk can feel the entity and then can hold the creature in place. Meanwhile it's one gigantic long vine-like tentacle will shoot out and snatch it's prey bringing it into it's awaiting venomous jaws.