👉 Protoceratidae is a family of crustaceans that includes the common crayfish, also known as the black widow. These crabs have two pairs of legs and are found in various freshwater habitats across North America, including rivers, lakes, and oceans. These crabs are characterized by their long, slender bodies with four legs (two on each side) and a short snout. They have a distinctive black coloration that is usually covered in white spots or scales. The family
