The Valvatida are an order of starfish in the class Asteroidea, which contains 695 species in 172 genera in 17 families.
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.
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.
Ceramaster is a genus of cushion stars in the family Goniasteridae. The species in this genus have no arms. They live in deeper waters than most sea stars.
Euthria is a genus of sea snails, marine gastropod mollusks in the family Buccinidae, the true whelks.
Henricia is a large genus of slender-armed sea stars belonging to the family Echinasteridae. It contains about fifty species.
Luidia is a genus of starfish in the family Luidiidae in which it is the only genus. Species of the family have a cosmopolitan distribution.
Calliaster is a genus of starfish in the family Goniasteridae
Nylanderia is a large genus of ants in the subfamily Formicinae. The genus has a nearly cosmopolitan distribution with species inhabiting a wide array of habitats in almost all geographic regions. Nylanderia, currently containing over 110 species, is an ecologically important genus, with some species reported as being invasive. The ants are small to medium in size and range in color from pale yellow to black.
Psilaster is a genus of sea stars of the family Astropectinidae.
Myxasteridae is a family of deep-sea velatid sea stars containing nine species in three genera.
Evoplosoma is a genus of deep-sea sea star in the family Goniasteridae.
Pekania is a genus of mustelid that contains a single living species, the fisher (Pekania pennanti). Formerly placed in the genus Martes, it was determined to be distinct enough to be placed within its own genus. A 2013 study also identified several fossil species formerly in Martes that are more closely related – and probably ancestral – to the fisher, moving them into Pekania as well.
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.
Brisinga is a genus of starfish in the family Brisingidae. The species in this genus are primarily found in deep sea habitats.
Pseudarchaster is a genus of echinoderms belonging to the family Pseudarchasteridae.
Tamaria is a genus of echinoderms belonging to the family Ophidiasteridae.
Astropectinides is a genus of echinoderms belonging to the family Astropectinidae.
Sphaeriodiscus is a genus of echinoderms belonging to the family Goniasteridae.
Gilbertaster is a genus of echinoderms belonging to the family Goniasteridae.
