FIG. 44.23 Arthropods. This diverse phylum includes four main groups: chelicerates (spiders, scorpions, and ticks), myriapods (centipedes and millipedes), crustaceans (including lobsters, shrimp, and crabs), and insects.
Photo sources: (top to bottom) B. G. Thomson/Science Source; Tom McHugh/Science Source; Michael S. Nolan/SeaPics.com; Christian Hütter/imageBROKER/age fotostock.