Arachnus are armadillo-like creatures found on SR388. They appear on SR388 in Metroid II: Return of Samus and appear in a mimicked form in Metroid Fusion. Arachnus appear much less often than most other creatures on SR388. An X Parasite mimics an Arachnus aboard the B.S.L research station. They are capable of attacking by with fireballs and they can also ram their targets.