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Merostomata
Head of a Pterygotus sea scorpion, on white background
Pterygotus scorpion
Pterygotus swimming in prehistoric waters
Pterygotus, an extinct arthropod, front view on
Eurypterus tetragonophthalmus, Silurian of Europe
Eurypterus tetragonophthalmus, Silurian of Europe
Pterygotus sea scorpion from the Paleozoic Era
Pterygotus sea scorpion from the Paleozoic Era
Pterygotus sea scorpion from the Paleozoic Era
Eurypterus, a fossil eurypterid
Mesolimulus, a fossil horseshoe crab
Limulus polyphemus, horsehoe crab
Fossilised Mesolimulus
Pterygotus anglicus, giant water scorpion
Limulus polyphemus, horseshoe crab
Eurypterius lacustris, sea scorpion
Silurian merostomata or sea scorpions
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