| Tropidaster Temporal range: Early Jurassic | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Asteroidea |
| Order: | Velatida |
| Family: | † Tropidasteridae Wright, 1880 |
| Genus: | † Tropidaster Forbes, 1850 |
Tropidaster is an extinct genus of sea stars that lived in the Early Jurassic. It is the only genus in the family Tropidasteridae. [1] Its fossils have been found in Europe.
The Valvatida are an order of starfish in the class Asteroidea, which contains 695 species in 172 genera in 17 families.
Patiriella is a genus of sea stars of the family Asterinidae. Many species formerly included in this genus have been transferred to other genera. They are commonly known as carpet sea stars.
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.
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.
The Oreasteridae are a family of sea stars in the class Asteroidea.
Poraniopsis is a genus of starfish in the family Poraniidae in the order Valvatida. Poraniopsis echinaster is the type species.
Certonardoa semiregularis is a species of sea star in the family Ophidiasteridae. It is the only species in the genus Certonardoa.
Archasteridae is a family of starfish found in shallow waters in the tropical Indo-Pacific region. The genus Astropus, previously included in this family, is now included in the genus Archaster with the single species, Astropus longipes, being accepted as Archaster lorioli Sukarno & Jangoux, 1977.
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.
Fromia is a genus of starfish belonging to the family Goniasteridae.
Pterasteridae is a family of sea stars in the order Velatida, consisting of eight genera.
Evoplosoma is a genus of deep-sea sea star in the family Goniasteridae.
Circeaster is a genus of abyssal sea stars in the family Goniasteridae.
Astroceramus is a genus of abyssal sea stars in the family Goniasteridae.
Apollonaster is a genus of abyssal sea stars in the family Goniasteridae. They can be identified by their bare abactinal plate surfaces and multiple accessory granule rows on their abactinal plates. To date, Apollonaster has been found in the tropical Atlantic region and Hawaiian Islands region oceans, with no other locations or species being known as of 2015.
Euretaster insignis, commonly known as the striking sea star, is a species of starfish in the family Pterasteridae found in the central west Pacific Ocean. It is one of only three species in the order Velatida to be found in shallow water in the tropics. The young are brooded in a cavity underneath a "supradorsal" membrane.
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