In invertebrate zoology, a lesser known order includes modern extant Onychophores, aka "velvet worms" or 'Walking Worms'. They share attributes with arthropods [including the insects] such as segmented body, chitin metabolism, and leg-like protuberances on their segments. As they walk, they lift their body entirely off the ground [unlike worms, which crawl on the ground, and also do not produce chitin]. They capture prey by shooting super-glue on their prey, which hardens and traps them in place. They also reportedly molt [ectodysis] like the other arthropods, though their exterior chitin is very thin and does not provide an exoskeleton like as for arthropods. They are tropical land creatures these days, though their ancestors were reportedly marine. So what are they? Worms? Arthropods? Has anyone seen any?
