One Bigas-Sarthropod This is NOT a photoshop manipulation. Coconut crabs are the largest terrestrial arthropods known, and can have an arm spread of up to three feet. Now, as far as extra-terrestrial arthropods, um, well, go fish. [Source: here, via Arbroath.] UPDATE: HUGE CRABS FOUND HERE! Share this:FacebookTwitterTumblrPinterestRedditMoreFacebookEmailLinkedInPrintPocketWhatsAppSkypeTelegramLike this:Like Loading...