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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
- Asteroidea, Blainville, 1830
- Animalia
- Population
- Defensive Adaptations
- Regeneration
- Unusual Feeding
There are some 2,000 species of sea star living in all the world’s oceans, from tropical habitats to the cold seafloor. The five-arm varieties are the most common, hence their name, but species with 10, 20, and even 40 arms exist.
They have bony, calcified skin, which protects them from most predators, and many wear striking colors that camouflage them or scare off potential attackers. Purely marine animals, there are no freshwater sea stars, and only a few live in brackish water.
Beyond their distinctive shape, sea stars are famous for their ability to regenerate limbs, and in some cases, entire bodies. They accomplish this by housing most or all of their vital organs in their arms. Some require the central body to be intact to regenerate, but a few species can grow an entirely new sea star just from a portion of a severed ...
Most sea stars also have the remarkable ability to consume prey outside their bodies. Using tiny, suction-cupped tube feet, they pry open clams or oysters, and their sack-like cardiac stomach emerges from their mouth and oozes inside the shell. The stomach then envelops the prey to digest it, and finally withdraws back into the body.
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Quick facts about these diverse echinoderms with unique methods of eating. The sea star (starfish, Asteroidea). Starfish facts! You may recognize these as Pe...
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- Deep Marine Scenes
3 de may. de 2024 · May 2, 2024, 4:33 AM ET (Newsweek) Kill Starfish Now to Save Great Barrier Reef—Scientists. sea star, any marine invertebrate of the class Asteroidea (phylum Echinodermata) having rays, or arms, surrounding an indistinct central disk. Despite their older common name, they are not fishes. high Arctic sea star.
- The Editors of Encyclopaedia Britannica
You probably know sea stars as starfish, the name sea stars are commonly known by. But sea stars aren’t really fish. Sea stars, like sea urchins and sand dollars, do not have backbones, which makes them part of a group called invertebrates. Fish have backbones, which makes them vertebrates. Got it? Most sea stars sport spiny skin and five arms, although some can grow as many as 50 arms. The ...
12 de nov. de 2009 · 1 of 10. Sunflower Sea Star A sunflower sea star is draped moplike over a seafloor rock off the British Columbia coast. Though commonly called starfish, sea stars are not fish but echinoderms ...
A starfish, also sometimes known as a sea star, is a star-shaped echinoderm commonly found throughout the world’s oceans. There are around 1,900 species of starfish around the world living in the seabed.
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