The Spinulosida are an order of sea stars containing at least 120 species in seven genera and two families.

Spinulosids completely lack pedicellariae and have a delicate skeletal arrangement. Their name comes from the presence of numerous low spines on the aboral (upper) surface. No fossil spinulosids have yet been found.

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

The Echinasteridae are a family of starfish in the monotypic order Spinulosida. The family includes eight genera and about 133 species found on the seabed in various habitats around the world.

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