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Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea (/ ˌ æ s t ə ˈ r ɔɪ d i ə /). 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
Marthasterias glacialis is a fairly large starfish with a small central disc and five slender, tapering arms. Each arm has three longitudinal rows of conical, whitish spines, usually with purple tips, each surrounded by a wreath of pedicellariae.
Patiria miniata, the bat star, sea bat, webbed star, or broad-disk star, is a species of sea star (also called a starfish) in the family Asterinidae. It typically has five arms, with the center disk of the animal being much wider than the stubby arms are in length. [2] Although the bat star usually has five arms, it sometimes has as many as ...
Ophiura ophiura is an active brittle star, moving with a jerky swimming action of its legs and sometimes burrowing. [2] It is a filter feeder, feeding on a wide range of food, [1] but also a bottom-feeding carnivore and detritivore. [7]
A starfish has five identical arms with a layer of “tube feet” beneath them that can help the marine creature move along the seafloor, causing naturalists to puzzle over whether sea stars have ...
Coscinasterias tenuispina is a starfish in the family Asteriidae. It is sometimes called the blue spiny starfish or the white starfish . It occurs in shallow waters in the Atlantic Ocean and the Mediterranean Sea.
Many of the food items were swallowed whole and had been ingested by the starfish everting its stomach and engulfing its prey. [4] It also buries itself in the substrate and engulfs "mouthfuls" of sediment, filtering it through its oral spines and extracting detritus and small organisms such as brittle stars .
Leptasterias aequalis, common names little six-rayed seastar or six-armed star, is a species of brooding starfish. [1] This is a small species, with a total width of only about 5 centimetres (2.0 in). The coloration is extremely variable. This seastar is found in the northeastern Pacific Ocean, [2] from Washington [3] to Southern California.