Echinaster
Echinaster is a genus of starfish, also known as sea stars, in the family Echinasteridae. These are commonly known as “spiny sea stars” because their bodies are typically covered with numerous spines. The genus is widespread throughout the world’s oceans, occurring in a variety of habitats from shallow waters to deep-sea environments. Echinaster species are typically brightly colored, ranging from red and orange to purple and blue, and play an important role in marine ecosystems as predators and scavengers.
Common Names
Besides "spiny sea star," other common names for Echinaster species include:
- Cushion star
- Comb star
- Spiny starfish
Characteristics
Echinaster species are characterized by the following features:
- Five-rayed body: Like most starfish, they have a central disc with five arms extending outward.
- Spines: Their bodies are covered in numerous, often sharp, spines, giving them their common name.
- Bright colors: Echinaster species are typically brightly colored, with shades of red, orange, purple, blue, and sometimes even yellow.
- Tube feet: They have tube feet, which are small, muscular projections that help them move and grip surfaces.
- Pedicellariae: Some species have pedicellariae, which are small, pincer-like structures that help defend against predators and keep their bodies clean.
Environments
Echinaster species are found in a variety of marine environments, including:
- Shallow waters: They can be found in intertidal zones and shallow reefs.
- Deep-sea environments: Some species inhabit the deep sea, where they may live on the seabed or on seamounts.
- Coral reefs: They are often found living among coral reefs, where they feed on a variety of organisms.
- Seagrass beds: They can also be found in seagrass beds, where they prey on small invertebrates.
References
For more information on Echinaster, consult these reliable sources: