The Yellow-banded Aracanth is a deadly predator found on rocky terrain in arid regions, usually hiding under rocks or in small openings.
These invertebrates are no bigger than your average domestic cat, and have a light build, making them very agile when catching prey or escaping from danger. They are equipped with poisonous spines, with the ones on their back causing a slight sting, and one on their tail which contains a toxin than can be fatal.
EDIT: I removed it's long neck. I may make a long-necked species later. Here's the old pic if you want to see it: [link]