Amphiura chiajei is a species of brittle star belonging to the family Amphiuridae. Brittle stars are echinoderms, characterized by their star-shaped bodies with five long, slender arms that are easily detached. These fascinating creatures are widespread throughout the world’s oceans, contributing significantly to the biodiversity of various marine ecosystems.
Description and Characteristics
Amphiura chiajei is a relatively small brittle star, with a maximum arm span of around 5 cm. Its central disk is typically a pale yellow color, while its arms are often a darker brown or gray. The arms are covered in small, delicate scales, and each arm has a series of lateral spines that help the animal to move and grip the substrate. This brittle star exhibits a characteristic feature of its genus: a pair of small, rounded tentacle scales that are situated at the base of each arm. These tentacle scales are instrumental in the brittle star’s burrowing behavior.
Habitat and Occurrence
Amphiura chiajei is a common inhabitant of the European Atlantic, with its distribution spanning from the North Sea to the Mediterranean Sea. It is typically found on sandy or muddy bottoms, often in shallow waters. This species prefers a depth range between 5 and 50 meters, though it has been documented at greater depths in certain areas. The preference for sandy or muddy bottoms indicates its affinity for soft substrate habitats, making it a prevalent presence in these aquatic ecosystems.
Taxonomy
The species Amphiura chiajei belongs to the class Ophiuroidea, which encompasses brittle stars, basket stars, and serpent stars. Ophiuroids are a diverse group within the phylum Echinodermata, distinguished by their unique body structure and their ability to regenerate lost limbs. Amphiura chiajei is further classified within the order Amphilepidida, which includes brittle stars with a distinct arm structure and a tendency towards burrowing behavior. Finally, it is a member of the family Amphiuridae, a large family characterized by their flexible arms and their ability to move quickly and efficiently.
Feeding
Amphiura chiajei, like many brittle stars, is a detritivore, feeding primarily on organic debris, plankton, and small invertebrates. It uses its flexible arms to sweep the seafloor, capturing food particles and transporting them to its mouth. This species plays an important role in marine ecosystems by breaking down organic matter and recycling nutrients, contributing to the health and balance of the benthic environment.
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