Solaster regularis, commonly known as the “sun star”, is a fascinating and visually striking species of starfish found in the North Atlantic Ocean. It is characterized by its distinctive radial symmetry and vibrant coloration, making it a captivating sight for marine enthusiasts and researchers alike.
Description & Characteristics
Solaster regularis, also known as the “sun star”, is a large and conspicuous starfish with a distinctive radial symmetry. Its body is typically star-shaped, with 10 to 15 arms radiating outwards from a central disc. The arms are relatively short and thick, giving the starfish a compact appearance. The aboral surface (upper side) of the starfish is covered in small, spiny ossicles, which give it a rough texture. The oral surface (underside) is smooth and features a central mouth surrounded by a ring of tube feet. The starfish’s color is highly variable, ranging from pale yellow to deep orange and red, often with intricate patterns of darker markings. The maximum size of a Solaster regularis can reach up to 30 cm in diameter.
Habitat and Occurrence
Solaster regularis is a common inhabitant of the North Atlantic Ocean, particularly in the colder waters of the British Isles, Scandinavia, and the North Sea. This species typically inhabits rocky and sandy bottoms, as well as kelp forests, making it a prevalent presence in these aquatic ecosystems. It is found in the neritic zone, which extends from the shoreline to the edge of the continental shelf, and can occur at depths ranging from the intertidal zone to around 500 meters.
Taxonomy
Solaster regularis is classified within the phylum Echinodermata, which also includes sea urchins, sea cucumbers, and brittle stars. It belongs to the Class: Asteroidea, the class that encompasses all starfish species. Within this class, Solaster regularis is further categorized within the Order: Valvatida, an order that includes starfish with a unique valve-like structure in their ambulacral grooves. Finally, Solaster regularis is a member of the Family: Solasteridae, a family that includes a diverse array of sun star species.
Feeding
Solaster regularis is a voracious predator, feeding primarily on a variety of invertebrates, including other starfish, brittle stars, sea urchins, and bivalve molluscs. Its feeding habits are characterized by its ability to evert its stomach through its mouth and engulf its prey, effectively digesting the soft tissues. The Solaster regularis, with its wide range of prey and its ability to consume a large amount of food at once, plays a crucial role in maintaining the balance of the marine ecosystems it inhabits.
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