Poraniidae

Poraniidae is a family of starfishes in the order Valvatida.

Marginaster is a genus of starfish in the family Poraniidae within the order Valvatida. It was named in 1881 by Edmond Perrier, and the type species is M. pectinatus. In 1995, a fossil brittle star was given the same generic name; however, because the name was preoccupied by the starfish, the brittle star required renaming. The brittle star was renamed Marginix in 2015.

species of echinoderm

species of echinoderm

Porania is a genus of starfish in the family Poraniidae.

Poraniopsis is a genus of starfish in the family Poraniidae in the order Valvatida. Poraniopsis echinaster is the type species.

Clavaporania fitchorum is a species of starfish in the family Poraniidae. It is the only known species of the genus Clavaporania. It is native to the South Pacific Ocean and is found in deep water off the coast of Australia (it was discovered at Hjort Seamount, south of Macquarie Island).

Bathyporania ascendens is a species of starfish in the family Poraniidae, and the only species of the genus Bathyporania. It is native to the Pacific Ocean and is found in deep water off the coast of North America (it was discovered at Davidson Seamount).

Glabraster is a genus of starfish in the family Poraniidae. It is monotypic, the sole species being Glabraster antarctica. It is also known as the red spiny cushion star.