User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-74.193.207.108-20121010182330/@comment-4370375-20121010190133

Technically spiders and crabs are only loosely related in that they are in the Phylum of Arthropod. Spiders are in the subphylum Chelicerata while crabs are in the subphylum Crustacea. That said, Akura Vashimu and Akura Jebia are both classified as Carapaceons despite the fact that scorpions are in the subphylum Chelicerata as well so it might be possible.