this post was submitted on 23 Apr 2025
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Close. Arthropoda is the phylum under Animalia. From there you have the four subphyla Crustacea (crustaceans), Hexapoda (insects), Myriapoda (centipedes and millipedes), and Chelicerata (chelicerates). So they are closely related relatively speaking, but they're separate subphyla.
If anything, funnily enough, the clade Pancrustacea is comprised of just crustaceans and hexapods to the exclusion of myriapods and chelicerates. Even more messy – I learned just now that – is that Arthropoda can be divided into two clades Chelicerata and Mandibulata (where Mandibulata contains myriapods and Pancrustacea), so in reality, not only are horseshoe crabs more closely related to a black widow spider than to crabs, but crabs are substantially more closely related to a mosquito than to horseshoe crabs.
Thanks for the info, I love learning this kinda stuff.
!Subscribe to arthropod facts
Welcome to Arthropod Facts! Did you know that king crabs aren't actually crabs? King crabs (family Lithodidae) sit in the hermit crab superfamily Paguroidea in the decapod infraorder Anomura, whereas true crabs comprise the decapod infraorder Brachyura. The current strong and widespread scientific consensus is that king crabs are hermit crabs which originated in the North Pacific about 15 million years ago and evolved a crab-like, calcified exoskeleton through carcinisation.
Evidence for this includes:
An easy way to distinguish a king crab from a true crab is to look at the number of visible legs it has. While all decapods have ten legs, the last (hind) pair of legs in king crabs are dramatically reduced in size and usually sit inside the branchial chamber – used for cleaning rather than walking. By contrast, crabs always have their last pair of walking legs, although in the crab superfamily Portunoidea these are flattened and used as paddles for swimming. Thus, when counting the chelipeds (claw-bearing arms) as legs, you'll see eight legs on a king crab (four rows of two) and ten legs on a true crab (five rows of two).
Thank you for subscribing to Arthropod Facts!
Thank you so much!