👉 Astacus is a genus of sea snails in the family Cerambycidae. They are found in many parts of the world, including tropical and subtropical regions. Astacuses have a long, slender body with four legs and eight arms that they use for walking, climbing, and attacking other sea creatures. They can reach lengths up to 1 meter (3 feet) and weigh up to 2 kilograms (4 pounds). Astacuses are known for their hard shells and