Cypraecassis tenuis, commonly known as the is a species of large sea snail, a marine gastropod mollusk in the family Cassidae, the helmet shells. It is one of the most sought-after shells in the world.
Description and Characteristics
Cypraecassis tenuis is a large, heavy shell with a distinctive, smooth, and glossy surface. Its color varies from a pale cream to a deep brown, often with intricate patterns of darker brown or black markings. The shell is typically ovoid in shape, with a broad, rounded spire and a wide, open aperture. The outer lip is thick and slightly flared, while the inner lip is smooth and often has a series of denticles or teeth. The maximum size of Cypraecassis tenuis can reach up to 18 centimeters in length, making it one of the largest species of helmet shell.
Habitat and Occurrence
Cypraecassis tenuis is found in tropical waters of the Indo-Pacific region, ranging from the Red Sea and the Indian Ocean to the Pacific Ocean, including areas around Australia, Indonesia, and the Philippines. This species typically inhabits shallow water environments, often in sandy or muddy bottoms, and prefers depths ranging from 10 to 50 meters. It is often found in the neritic zone, the area of the ocean that extends from the shoreline to the edge of the continental shelf, which is characterized by its relatively shallow depths and abundant sunlight.
Taxonomy
The species Cypraecassis tenuis belongs to the Class: Gastropoda, Order: Littorinimorpha, and Family: Cassidae. This family is commonly referred to as the helmet shells, and it includes many species of large, heavy shells. Cypraecassis tenuis is closely related to other species within the genus Cypraecassis, such as Cypraecassis rufa and Cypraecassis tricornis.
Feeding
Like other members of the Cassidae family, Cypraecassis tenuis is a carnivorous species. It primarily feeds on echinoderms, particularly sea urchins. The strong, muscular foot of Cypraecassis tenuis allows it to pry open the shells of its prey, and its radula, a ribbon-like structure with rows of teeth, helps it scrape away the soft tissues of the sea urchin. This feeding behavior plays a crucial role in maintaining the ecological balance of its habitat.
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