Oreasteridae
Oreasteridae is a family of starfish belonging to the order Valvatida. Commonly known as “cushion stars,” these echinoderms are characterized by their unique, flattened, cushion-shaped bodies. They are typically found in tropical and subtropical marine environments, often inhabiting coral reefs and rocky substrates. Oreasteridae starfish possess several distinguishing features, including a rigid, armored body, numerous small spines, and a distinct madreporite located on the aboral surface. They are generally slow-moving and often feed on sponges, algae, and other benthic organisms.
Common Names
Members of the Oreasteridae family are commonly known as "cushion stars" due to their characteristic flat, cushion-like bodies. Other common names include "sand stars" and "sea stars."
Characteristics
Oreasteridae starfish are distinguished by the following characteristics:
- Flattened, Cushion-Shaped Body: They possess a distinctive flat, cushion-like body shape.
- Rigid, Armored Body: Their bodies are covered by a tough, rigid exoskeleton consisting of calcareous ossicles.
- Numerous Small Spines: Their bodies are covered in numerous small spines, which provide protection and assist in movement.
- Distinct Madreporite: A prominent madreporite, a sieve-like opening on the aboral surface, is used for water intake.
- Five Arms: They typically have five arms, although some species may have more.
- Slow-Moving: Oreasteridae starfish are generally slow-moving organisms.
Environment
Oreasteridae starfish are predominantly found in tropical and subtropical marine environments. They are commonly associated with coral reefs and rocky substrates.
References
For further information on Oreasteridae starfish, you can consult the following resources: