The Vermilion Star – Mediaster aequalis is a striking and common starfish species known for its vibrant red color. This species is found in a variety of marine habitats, playing a crucial role in the delicate balance of its ecosystem.
Description & Characteristics
The Mediaster aequalis typically displays a pentagonal shape, with five distinct arms radiating outward from a central disc. The arms are relatively short and thick, giving the starfish a compact appearance. The upper surface, or aboral surface, is covered in small, granular ossicles, lending it a slightly bumpy texture. The vivid red coloration of the Vermilion Star is a defining characteristic, although the intensity of the red may vary depending on factors such as geographic location and individual variation.
Habitat and Occurrence
The Mediaster aequalis is a common inhabitant of the intertidal zone and shallow subtidal regions. This means they can be found along rocky shores, sandy beaches, and in seagrass meadows. They are frequently observed in the infralittoral zone, which extends from the low tide mark to a depth of about 20 meters (65 feet). The Vermilion Star is often found clinging to rocks or buried in sand, seeking shelter and access to their food sources.
Taxonomy
The Mediaster aequalis is a member of the Class: Asteroidea, Order: Valvatida, and Family: Goniasteridae. This classification reflects its place within the broader group of starfish, its specific order within the class, and its familial connection to other related species.
Feeding
The Mediaster aequalis is an opportunistic omnivore. Its diet is varied and includes a wide range of food sources, such as: Bryozoans (sea mats), carrion, detritus, sponges, worms, and sea squirts. This versatility allows them to thrive in different environments and take advantage of available food resources. As a predator, the Vermilion Star also feeds on zoobenthos, small organisms that live on the seabed.
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