Praearcturus

Information
Praearcturus gigas was a prehistoric scorpion from what is now the United Kingdom that lived in the early Devonian 416-412 million years before present, with incomplete specimens found in Rowlestone Hill, England; and Trecastle, Powys, Wales. An unidentified specimen is also known from what is now Wyoming. The largest discovered specimen had a carapace width of about 10 centimeters and could have grown to around a meter in length. Praearcturus gigas roamed the prehistoric continent Euramerica and was likely carnivorous, possibly feeding on washed-up fish and smaller arthropods, some of which would become today's insects. Later on in the Devonian, tetrapods would evolve and take over the niches of the large scorpions, before becoming smaller in the Carboniferous and scaling back up once again in the Permian.

Design
Praearcturus gigas is a large primitive scorpion with a fourteen-segmented body; one segment consists of its head, seven of which make up its body, and six of which form its tail. It has five pairs of limbs, one of which is modified into pinchers for grabbing onto enemies and prey. It lacks a stinger on its tail unlike modern scorpions. Most of its body is a dark pale-yellow in color, with brown and green highlights. On its fourth segment is a darkened line which is part of its pattern. The claws and stomach are more pale than the coloration of the rest of the body. The eyes are a dark pale blue.