Definition: The term "turritellidae" is a genus of crustaceans, commonly known as crabs. It consists of three species: 1. Turritopsis dohrnii - This species has a large snout and a long, thin tail that helps it to swim in shallow waters. 2. Turritopsis viridis - This species has a small snout and a short, thick tail that helps it to crawl on land. 3. Turritopsis oculata -