Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea. Common usage frequently finds these names being also applied to ophiuroids, which are correctly referred to as brittle stars or basket stars. Starfish are also known as Asteroids due to being in the class Asteroidea. About 1,900 species of starfish occur on the seabed in all the world's oceans, from the tropics to frigid polar waters. They are found from the intertidal zone down to abyssal depths, 6,000 m (20,000 ft) below the surface.

Velatida. Retrieved November, 05 2021, from en.wikipedia.org/wiki/Starfish.

Pterasteridae is a family of sea stars in the order Velatida, consisting of eight genera.

Pterasteridae. Retrieved November, 05 2021, from en.wikipedia.org/wiki/Pterasteridae.

Pteraster is a genus of sea stars in the family Pterasteridae.

Pteraster. Retrieved November, 05 2021, from en.wikipedia.org/wiki/Pteraster.