WAnthaster valvulatus is a species of sea stars in the family Orestieridae. It is the sole species in the genus Anthaster. While its common name is the brick red seastar, individuals also occur in purple, orange and multicoloured combinations of these colours.
WAstichopus is a monotypic genus of sea cucumbers, the only species in the genus being Astichopus multifidus. It is commonly known as the furry sea cucumber or the fissured sea cucumber and is native to the Caribbean Sea.
WThe giant basket star, Astrophyton muricatum, is an echinoderm found in shallow parts of the tropical western Atlantic and throughout the Caribbean Sea and the Gulf of Mexico. It is the only species in the genus Astrophyton. During the day, it curls up into a tight ball shape to protect itself from predators. At night, it climbs to an elevated point to feed by extending its intricately branched feeding arms in a bowl-like shape in order to snare passing plankton and other organisms from the current.
WAstrosarkus idipi is a species of sea stars in the family Oreasteridae. It is the sole species in the genus Astrosarkus. It is sometimes referred to as a "Pumpkin sea star".
WAustralostichopus mollis, formerly Stichopus mollis, commonly known as brown sea cucumber or Australasian sea cucumber, is a species of sea cucumber that has stimulated interest for its fishery potential in the Southern Hemisphere, and for its capability to reduce waste produced by aquaculture. It is the sole species in the genus Australostichopus. Despite its ecological role and abundance in New Zealand coastal waters, the scarcity of knowledge regarding A. mollis biology and ecology has hindered the development of a stable fishery industry. Importantly, A. mollis represents promising business potential within an important Asian market. Recently its potential as a functional food has been evaluated, highlighting the nutritious components
WCenocrinus is a monotypic genus of stalked crinoids in the family Isselicrinidae. The great West Indian sea lily is the only species in the genus and is found in deep waters in the Caribbean Sea and Gulf of Mexico.
WClavaporania 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.
WHalityle regularis, sometimes known as the Mosaic Cushion Star, is a species of sea stars in the family Oreasteridae. It is the sole species in the genus Halityle. It lives in depths of 16 – 90 meters.
WHeliophora orbicularis, also known as the West African Sand Dollar, is a small sand dollar in to the family Rotulidae, and the only species in the genus Heliophora. It, and other members of Rotulidae have been found in West African marine strata from the Late Miocene onward. Like the related Rotula, it is still extant.
WMarthasterias is a genus of starfish in the family Asteriidae. It is monotypic and the only species in the genus is Marthasterias glacialis, commonly known as the spiny starfish. It is native to the eastern Atlantic Ocean.
WMonachaster sanderi is a species of sea stars in the family Oreasteridae. It is the sole species in the genus Monachaster.
WNidorellia armata, also known as the chocolate chip star, is a species of starfish from warmer parts of the East Pacific, where it ranges from the Gulf of California to northwest Peru, including the Galápagos. It is the only species in the genus Nidorellia. N. armata can be found in tropical waters clinging on corals and rocky reefs; and are sometimes kept as pets in home marine aquariums.
WOrthasterias 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.
WPearsonothuria is a genus of sea cucumbers in the family Holothuriidae. Pearsonothuria graeffei is the only species in the genus. Graeffe's sea cucumber is found in the tropical Indo-Pacific Ocean and the type locality is Viti Island, Fiji.
WPelagothuria natatrix is a species of sea cucumber, in the family Pelagothuriidae.
WProisocrinus ruberrimus is a species of crinoids that is in the monotypic genus Proisocrinus. The genus is in the monotypic family Proisocrinidae
WPromachocrinus is a genus of free-swimming, stemless crinoids. It is a monotypic genus, and the only species in the genus is Promachocrinus kerguelensis. This is a coldwater crinoid which is found in the seas around Antarctica and surrounding island groups, including under the sea ice.
WPseudoreaster obtusangulus is a species of sea stars in the family Orestieridae. It is the sole species in the genus Pseudoreaster.
WPycnopodia helianthoides, commonly known as the sunflower sea star, is a large sea star found in the northeast Pacific. The only species of its genus, it is among the largest sea stars in the world, with a maximum arm span of 1 m (3.3 ft). Sunflower sea stars usually have 16 to 24 limbs; their color can vary widely. They are predatory, feeding mostly on sea urchins, clams, snails, and other small invertebrates. Although the species had been widely distributed throughout the northeast Pacific, its population has rapidly declined since 2013.