Anthenea aspera, commonly known as the “spiny sea star”, is a captivating marine invertebrate belonging to the family Oreasteridae. This species exhibits a distinctive morphology and plays a crucial role within its specific marine habitat.
Description & Characteristics
Anthenea aspera is a striking sea star, characterized by its robust, five-armed body. Its surface is covered in numerous, prominent spines, giving it its common name. The coloration of Anthenea aspera can vary, with individuals ranging from a deep reddish-brown to a pale yellowish-brown. The arms of this species are typically short and thick, tapering towards the tips. The aboral surface (upper surface) of the sea star is covered in a mosaic of calcareous plates, giving it a somewhat textured appearance. Anthenea aspera can reach a maximum size of around 20 centimeters in diameter.
Habitat and Occurrence
Anthenea aspera is a common inhabitant of tropical and subtropical coral reefs. These sea stars are typically found in shallow waters, ranging in depth from the intertidal zone down to about 50 meters. They prefer hard substrates, such as coral rubble, rocks, and seagrass beds. Anthenea aspera‘s distribution encompasses various marine zones, including the Indo-Pacific region. They are particularly abundant in the waters surrounding the Philippines, Indonesia, and Australia.
Taxonomy
Anthenea aspera is classified within the phylum Echinodermata, a diverse group that includes sea stars, brittle stars, sea urchins, and sea cucumbers. Anthenea aspera belongs to the Class: Asteroidea, which comprises all the sea stars. This class is further subdivided into various orders, with Anthenea aspera being a member of the Order: Valvatida. Finally, it is placed within the Family: Oreasteridae, a group of sea stars characterized by their robust, often spiny bodies.
Feeding
Anthenea aspera is an omnivorous sea star, with a diet that includes a variety of marine organisms. These sea stars are known to feed on algae, sponges, and other invertebrates, including mollusks and crustaceans. Their feeding strategy involves using their tube feet to capture prey and then engulfing it with their stomach, which can extend outwards from the body.
Image References