Calliostoma granulatum, commonly known as the Granulated Top Shell, is a species of marine snail belonging to the family Calliostomatidae. It is a relatively small, distinctive snail characterized by its unique granulation and coloring, which makes it an intriguing subject for marine enthusiasts and scientists alike.
Description & Characteristics
Calliostoma granulatum is a small, typically reaching a maximum size of 15 millimeters in diameter. Its shell is broadly conical, with a rounded apex, and is usually a pale brown or whitish color with reddish-brown markings. The most notable feature of this species is its granulation. The entire surface of the shell is covered in small, evenly spaced granules, giving it a rough, textured appearance. This granulation is a key characteristic for identification and sets it apart from other similar species.
Habitat and Occurrence
Calliostoma granulatum is a benthic species, meaning it lives at the bottom of the seafloor. It is primarily found in the sublittoral zone, which extends from the low tide mark to depths of approximately 200 meters. These snails thrive in a range of marine habitats, including rocky reefs, sand bottoms, and seagrass meadows. They are particularly abundant in areas with moderate wave action and currents, which provide them with a steady supply of food and oxygen. Calliostoma granulatum is typically found at depths ranging from 5 to 50 meters, with a preference for areas with a hard substrate like rocky outcrops.
Taxonomy
Calliostoma granulatum belongs to the Class: Gastropoda, Order: Trochida, and Family: Calliostomatidae. This family is characterized by its members having a distinctive conical shell, often adorned with spiral ridges or granules. The Trochida order encompasses a vast array of marine snails, including many familiar species like the top shells and turban shells, which are characterized by their spirally coiled, flattened shells. These snails belong to the Gastropoda class, which represents the largest and most diverse group of mollusks, with over 80,000 living species. Gastropods are characterized by their single, spirally coiled shell and a distinctive muscular foot, which they use for locomotion.
Feeding
Calliostoma granulatum is an herbivore, meaning its diet consists primarily of algae and other plant matter. They use their radula, a ribbon-like structure covered in teeth, to scrape algae from rocks and other surfaces. They are considered grazers, meaning they play a crucial role in maintaining the balance of the marine ecosystem by controlling the growth of algae.
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