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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
- Population
- Defensive Adaptations
- Regeneration
- Unusual Feeding
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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.
Learn about the starfish, also known as sea star, an echinoderm with no brain but amazing abilities to regenerate and feed. See stunning images of different species and habitats of these marine animals.
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Starfish é uma loja especializada em aquários e peixes, com produtos de qualidade e sustentáveis. Se você procura um aquário dos sonhos, visite a Starfish ou compre online.
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...
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Há 2 dias · Learn about sea stars, marine invertebrates with rays or arms and a central disk. Find out how they feed, reproduce, and belong to three orders with different features and habitats.
- The Editors of Encyclopaedia Britannica
Learn about starfish (or sea stars), invertebrates with spiny skin and five arms, that live in various ocean habitats. Find out how they eat, defend themselves, regrow limbs and more.
12 de nov. de 2009 · Learn about sea stars, also known as starfish, and see stunning photos of these spiny-skinned echinoderms. Sea stars are not fish but related to sea urchins and sand dollars.
