This is the class of animals that possess two pairs of antennae, mandibles, an exoskeleton, and appendages with two branches.

 exoskeleton, two pairs of antennae andmandibles ..

Insects or arachnids? i dunno but at the same time i do know.
ya know?

Used to water and cool climates, probably not thick coated or fluffy. they most likely have thin coats and have to survive to find food. sorry if this wasn't the answer you were looking for..: )