South American River Scorpion South American River Scorpion (Thermus Potamoscorpio)Order: Scorpions (Scorpionida)Family: Botriurids (Bothriuridae)Habitat: freshwater rivers and lakes in tropical South America.The scorpions are among the oldest representatives of arthropods - the arachnids in particular; they have appeared on the world scene of life in the Palaeozoic era (the Silurian and the Devonian epochs). The first representatives of the scorpions were underwater animals, but over time they migrated to the land and have mastered the new way of life so successfully that they have outlived their underwater relatives by more than 300 million years.In the Neocen