Pterygotus sea scorpion from the Paleozoic Era.

ABDOMEN • ACUTIRAMUS • ANIMAL BODY • ANIMAL SCALE • ANIMAL TAIL • ANIMAL THEMES • ANIMAL • ANTENNA • AQUATIC • ARTHROPOD • ARTHROPODA • ARTHROPODS • BELLY • BURGESS SHALE FORMATION • CARAPACE • COLOR IMAGE • COLOUR IMAGE • COPY SPACE • CREATURE • CUTOUT • DEVONIAN • DIGITALLY GENERATED IMAGE • DIRECTLY ABOVE • EURYPTERID • EVOLUTION • EXOSKELETON • EXTINCT • FISH • FLEET • FULL LENGTH • ILLUSTRATION • ILLUSTRATIONS • INVERTEBRATE • LARGE • MARINE • MEROSTOMATA • NAVY • NO PEOPLE • OCEAN • ONE ANIMAL • ORGANISM • PALAEONTOLOGY • PALAEOZOOLOGY • PALEOBIOLOGY • PALEONTOLOGY • PALEOZOIC ERA • PALEOZOOLOGY • PREHISTORIC ERA • PRIMEVAL • PRIMITIVE • PTERYGOTIDAE • PTERYGOTUS BUFFALOENSIS • PTERYGOTUS • SCIENCE • SCIENCE: EVOLUTION • SCORPIO • SCORPION (ANIMAL) • SCORPION • SEA LIFE • SEA SCORPION • SEA • SEAS • SILURIAN • SMALL • SPECIES • SQUARE IMAGE • STOMACH • THORAX • TINY • WHITE BACKGROUND • WILDLIFE • WITHOUT PEOPLE • ZOOLOGY