Comaster

Comaster is a genus of crinoids, commonly known as feather stars or comatulids. These marine invertebrates are distinguished by their distinctive feathery arms and their ability to move freely across the ocean floor or swim short distances using their arms. They are found in a wide variety of marine environments, from shallow coral reefs to deep-sea trenches.

Noble Feather Star – Comaster nobilis

Characteristics

Comaster species possess the typical characteristics of crinoids, including a central body called a calyx, five arms that branch into pinnules (smaller, feather-like structures), and a stalk or cirri that anchors them to the substrate (in some species). They are typically characterized by their large size, with some species reaching up to 50 cm in diameter. Their arms are covered in numerous cirri, which are small, flexible appendages that aid in locomotion and feeding.

Environments

Comaster species are found throughout the world's oceans, primarily in tropical and subtropical waters. They are often found in association with coral reefs, seagrass beds, and rocky shores. Some species may live in deeper water, while others are more commonly observed in shallow, sunlit areas. They generally prefer environments with moderate water currents, which help them to filter food and oxygen from the water.

Feeding

Comaster species are suspension feeders, capturing food particles from the water column using their feathery arms. They use their cirri to sweep food particles toward their mouths. Their diet consists primarily of plankton, algae, and detritus.

Reproduction

Comaster species are sexually reproducing. They release sperm and eggs into the water column, where fertilization occurs. Larvae develop into free-swimming individuals that eventually settle onto the seabed, where they metamorphose into adults.

Examples of Comaster Species

  • Comaster multifidus
  • Comaster schlegelii
  • Comaster nobilis

References

For further information, please refer to the following resources: