| | trilobite; arachnid, arachnoid; myriapod; garden centipede, garden symphilid, symphilid, Scutigerella immaculata; tardigrade; centipede; millipede, millepede, milliped; sea spider, pycnogonid; Merostomata, class Merostomata; horseshoe crab, king crab, Limulus polyphemus, Xiphosurus polyphemus; Asian horseshoe crab; eurypterid; tongue worm, pentastomid; crustacean; onychophoran, velvet worm, peripatus; insect; instar |