Echinaster purpureus, commonly known as the purple sea star, is a vibrant and intriguing species found in the depths of the ocean. This star-shaped marine invertebrate is characterized by its striking purple coloration and unique morphology. The species is a common sight in various marine environments, contributing to the biodiversity of these ecosystems.
Description and Characteristics
Echinaster purpureus is easily recognized by its distinct purple hue, which can range in intensity depending on the individual and its environment. Its body is typically pentagonal, with five radiating arms. Each arm is covered in small, spiny ossicles, giving the star a slightly rough texture. The average size of an adult Echinaster purpureus is around 10 centimeters in diameter, but they can reach up to 15 centimeters. The mouth is located on the underside of the central disc, surrounded by five rows of tube feet used for locomotion and feeding.
Habitat and Occurrence
Echinaster purpureus is found in a variety of marine habitats, particularly in shallow to moderate depths. It is commonly observed in rocky intertidal zones, coral reefs, and seagrass meadows. The species is well-adapted to live in environments exposed to tidal fluctuations, demonstrating its resilience and adaptability. Echinaster purpureus is primarily found in the western Atlantic Ocean, with its range extending from the Gulf of Mexico to the Caribbean Sea. This distribution places the species in the North Atlantic Ocean’s neritic zone, an area that encompasses the coastal waters of the continental shelf.
Taxonomy
Echinaster purpureus is classified within the phylum Echinodermata, a group that includes sea stars, sea urchins, and sea cucumbers. The species belongs to the Class: Asteroidea, which comprises all sea stars. Echinaster purpureus is further categorized within the Order: Spinulosida, characterized by their spiny appearance. Finally, the species falls under the Family: Echinasteridae, known for their robust bodies and vibrant colors.
Feeding
Echinaster purpureus is a carnivorous species, relying on a diet of bivalves, gastropods, and other small invertebrates. The sea star utilizes its tube feet to pry open the shells of its prey. Once the shell is open, the sea star everts its stomach, enveloping the prey and releasing digestive enzymes. This unique feeding method allows Echinaster purpureus to efficiently consume and digest its prey.
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