The Valvatida are an order of starfish in the class Asteroidea, which contains 695 species in 172 genera in 17 families.
The Asterinidae are a large family of sea stars in the order Valvatida.
The Astropectinidae are a family of sea stars in the order Paxillosida. Usually, these starfish live on the seabed and immerse themselves in soft sediment such as sand and mud.
Coscinasterias is a genus of sea stars of the family Asteriidae.
Goniasteridae constitute the largest family of sea stars, included in the order Valvatida. They are mostly deep-dwelling species, but the family also include several colorful shallow tropical species.
Culcita is a genus of sea stars. They are found in tropical waters. Some are kept in home aquariums.
The Brisingids are deep-sea-dwelling starfish in the order Brisingida.
Cidaridae is a family of sea urchins in the order Cidaroida.
The Oreasteridae are a family of sea stars in the class Asteroidea.
Odontohenricia is a genus of starfish in the family Echinasteridae.
Certonardoa semiregularis is a species of sea star in the family Ophidiasteridae. It is the only species in the genus Certonardoa.
Solaster is a genus of sea stars in the family Solasteridae.
The Freyellidae are a family of deep-sea-dwelling starfish. It is one of two families in the order Brisingida. The majority of species in this family are found in Antarctic waters and near Australia. Other species have been found near New Zealand and the United States.
Myxasteridae is a family of deep-sea velatid sea stars containing nine species in three genera.
Circeaster is a genus of abyssal sea stars in the family Goniasteridae.
Aleutihenricia is a genus of starfish in the family Echinasteridae in the order Spinulosida.
Mediaster is a genus of starfish in the family Goniasteridae. It was circumscribed in 1857 by William Stimpson for M. aequalis, the genus's type species. Its junior synonym is the genus Isaster, which was circumscribed in 1894 by Addison Emery Verrill for the species now known as M. bairdi. Verrill himself synonymized the two genus names in 1899.
Asterodiscididae is a family of starfish. Members of the family have five short tapering arms and a wide disc. The family was first described by the Australian zoologist F.W.E. Rowe in 1977.
Sphaeriodiscus is a genus of echinoderms belonging to the family Goniasteridae.
Chitonaster is a genus of echinoderms belonging to the family Goniasteridae.
