sun star

noun

any starfish of the genus Solaster, inhabiting cold and temperate waters off both U.S. coasts.

Origin of sun star

First recorded in 1835–45

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Another relative is the Sun-star, which has twelve or fifteen rays, and often grows to a very large size.
How Sammy Went to Coral-Land
Emily Paret Atwater
Whilst my attention was concentrated on our planet, the Sun-star became eclipsed before my eyes.
Lumen
Camille Flammarion