Ctenactis
Ctenactis is a genus of starfish in the family Asteriidae. The genus is distributed throughout the Indo-Pacific region and is characterized by its distinctive features.
Common Names
Common names for species within the genus Ctenactis include:
- Comb-star
- Spiny starfish
Characteristics
Starfish belonging to the genus Ctenactis typically have a pentagonal body shape with five arms. They possess a distinct feature of rows of comb-like spines on the dorsal surface of their arms, which gives them their common name. These spines are arranged in longitudinal rows and are often tipped with a sharp point. The aboral surface (upper surface) of the starfish is typically covered in numerous small granules, giving it a rough texture.
Environments
Ctenactis species are typically found in tropical and subtropical waters, inhabiting rocky reefs and coral environments. They are often found in shallow depths, typically ranging from the intertidal zone to depths of 100 meters.