| Poraniidae | |
|---|---|
 | |
| Aboral and oral surfaces of Porania pulvillus | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Asteroidea |
| Order: | Valvatida |
| Family: | Poraniidae Perrier, 1875 [1] |
| Genera | |
11 genera (see text) | |
Poraniidae is a family of starfishes in the order Valvatida. [1]
Members of the family Poraniidae have a moderately well-developed row of marginal plates forming a distinct margin along the edge of both disc and arms. The aboral surface is covered with thick, naked skin, free from spines or pedicellariae but with scattered groups of papulae. There are no papulae or pedicellariae on the oral surface and the tube feet are always in two series. [2]
This family includes the following genera according to the World Register of Marine Species: [1]
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 live on the seabed in all the world's oceans, from warm, tropical zones to frigid, polar regions. They are found from the intertidal zone down to abyssal depths, at 6,000 m (20,000 ft) below the surface.
The Valvatida are an order of starfish in the class Asteroidea, which contains 695 species in 172 genera in 17 families.
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.
The Asterinidae are a large family of sea stars in the order Valvatida.
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.
The Forcipulatida are an order of sea stars, containing three families and 49 genera.
The Spinulosida are an order of sea stars containing at least 120 species in seven genera and one family.
The Velatida are an order of sea stars containing about 200 species in five families. These sea stars normally have thick bodies with large discs.
The Brisingids are deep-sea-dwelling starfish in the order Brisingida.
Poraniopsis is a genus of starfish in the family Poraniidae in the order Valvatida. Poraniopsis echinaster is the type species.
Solaster is a genus of sea stars in the family Solasteridae.
Callopatiria is a genus of starfish of the family Asterinidae. The genus is found in shallow waters off South Africa, down to a depth of about 82 m (269 ft).
Stylasterias is a genus of starfish in the family Asteriidae. Stylasterias forreri, the velcro star, is the only species in the genus. It is found on the Pacific coast of Canada and the United States.
Orthasterias is a genus of sea stars in the family Asteriidae. Orthasterias koehleri, the rainbow star or red-banded sea star, is the only species in the genus. It is found in the North Pacific Ocean.
Cryptasterina pentagona is a species of starfish in the family Asterinidae. It is found in shallow waters in north eastern Australia. Its life cycle includes the release of large-yolked eggs and the development of planktonic larvae which is in contrast to the very similar Cryptasterina hystera which is viviparous. The two appear to have diverged from a common ancestral line only a few thousand years ago.
Paranepanthia is a genus of starfish of the family Asterinidae. Members of the genus have five rays and are found in the waters around Australia, Indonesia and Antarctic New Zealand.
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.
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.
Hippasteria muscipula is one of twelve species of deep-sea sea star in the genus Hippasteria, which is in the family Goniasteridae.
Asterias rathbuni is a starfish native to the Pacific coasts of Alaska in the United States and Far East Russia. There are two subspecies.