This is merely a plausible explanation for the monster(s) in this article, and may or may not be considered canon to the series.
A small Carapaceon with an incredibly hard shell. Known to live in great numbers in the desert, or lurking underground, one must be careful when treading in its domain. Its brains are said to be a true delicacy.
Hermitaur are omnivores, much like real crabs. Hermitaur feed on plants, fruits, smaller organisms, and even humans. Larger monsters such as Congalala and Plesioth are known to feed on Hermitaur.
The Hermitaur possesses a small, plate-like shell on its back to offer some minor protection, or used for hiding from larger predators. For tools, Hermitaur have pincers used for grabbing and holding onto food.
Hermitaurs lay underground most of the time and only come up when they sense a disturbance, such as some prey or a hunter passing by.