Star fish

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Crown-of-Thorns Starfish (Acanthaster planci) on Coral Reef, Phi Phi Islands, Thailand. Borut Furlan/WaterFrame/Getty Images Depending on the species, a sea star's skin may feel leathery or slightly prickly. Sea stars have a tough covering on their upper side, which is made up of plates of calcium carbonate with tiny spines on their surface. A sea star's mouth is on its underside. When it catches its food, the sea star will wrap its arms around the animal's shell and pull it open just slightly. Then it does something amazing: the sea star pushes its stomach through its mouth and into the bivalve's shell. It then digests the animal and slides its stomach back into its own body. Kennedy, Jennifer. "12 Surprising Facts About Starfish." ThoughtCo, Apr. 5, 2023, thoughtco.com/facts-about-sea-stars-2291865. Kennedy, Jennifer. (2023, April 5). 12 Surprising Facts About Starfish. Retrieved from https://www.thoughtco.com/facts-about-sea-stars-2291865 Kennedy, Jennifer. "12 Surprising Facts About Starfish." ThoughtCo. https://www.thoughtco.com/facts-about-sea-stars-2291865 (accessed June 15, 2023).

4. They Can Regenerate Lost Limbs Starfish have the ability to regenerate lost limbs in cases of injury—for example, if they are hit by a rock from crashing tides. In fact, starfish are able to regrow an entire body from just one arm and at least one-fifth of their central disk. This is a slow process that can take up to a year. Starfish are also able to regenerate their neurons, something very few animals can do. 5. They Don't Have Any Blood Rather than blood coursing through their veins, starfish have a water vascular system. This system—common in echinoderms like starfish and sea cucumbers—is composed of canals connecting tube feet that pump seawater throughout the starfish’s body. The filtered seawater sends nutrients through its nervous system. Karen Gowlett-Holmes / Getty Images These innocent-looking creatures don’t just feast on algae and plants. Starfish are known to feed on creatures like injured fish, oysters, mussels, clams, and sand dollars. In some instances, starfish can even aggressive cannibals. Juvenile starfish, in particular, have been documented eating one another. Sirachai Arunrugstichai / Getty Images The unique eating style of starfish doesn’t stop with them using their tube feet—starfish also digest outside of their bodies. Once they have opened their food, they extend their stomach outside of their mouth and envelop their prey with their stomach. After their prey is partially digested, they draw the prey back into their digestive glands to complet...

Background Even though they are commonly called starfish, these animals are known more scientifically as sea stars. They do not have gills, fins, or even a skeleton. Sea stars have a tough, spiny covering and a soft underside. If you turn over a live sea star, you'll likely see its hundreds of tube feet wiggling. Sea Star Feeding Sea stars feed on bivalves like clams and mussels, and other animals such as small fish, barnacles, oysters, snails, and limpets. They feed by "grasping" their prey with their arms and extruding their stomach through their mouth and outside their body, where they digest the prey. They then slide their stomach back into their body. Kennedy, Jennifer. "A Guide to Starfish." ThoughtCo, Apr. 5, 2023, thoughtco.com/starfish-profile-p2-2291842. Kennedy, Jennifer. (2023, April 5). A Guide to Starfish. Retrieved from https://www.thoughtco.com/starfish-profile-p2-2291842 Kennedy, Jennifer. "A Guide to Starfish." ThoughtCo. https://www.thoughtco.com/starfish-profile-p2-2291842 (accessed June 15, 2023).

Table Of Content • 1 Main Characteristics of The Starfish • 1.1 Arms • 1.2 Mouth • 1.3 Color and skin • 1.4 Size and weight • 1.5 Behavior • 2 Habitat and Distribution • 3 What do starfish Eat? • 3.1 Digestive System • 4 Reproduction • 4.1 Sexual reproduction • 4.2 Asexual Reproduction • 5 Most Common Starfish • 5.1 1.-Brisingida. • 5.2 2. Forcipulatida. • 5.3 3.- Notomyotide. • 5.4 4.- Velatida • 5.5 5.- Valvatida • 5.6 6. Spinuloside. • 5.7 7.- Paxillosida. • 6 Main Threats of Starfish • 7 The Starfish and Human Beings Main Characteristics of The Starfish It is also necessary to clarify that the starfish are not fish; they are Echinoderm, which belong to the Asteroidea class. The starfish are born in the form of larvae, and once they break off from the egg, they start their maritime life, where they remain larvae until they are five years old. At this age they finally become adults, with a life expectancy which ranges between ten and thirty years. Everything will depend on the class they belong to. There are more than 2000 species of these animals scattered throughout the oceans, which can never remain in fresh water. The starfish are carnivorous creatures whose diet is based on crustaceans and mollusks. The stomach of the starfish has the peculiarity of being able to extract food from the outskirts of the body, since it is completely flexible and can make outward movements to catch its prey and then return to it. There are wrong beliefs about this marine creature, since...

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• The starfish’s ancestors first evolved during the Cambrian Period, around 539 million years ago. • The first recognizable starfish evolved during the Ordovician Period, around 450 million years ago. • The starfish nearly went extinct during the Great Dying at the end of the Permian Period around 252 million years ago. • The starfish species boomed in diversity starting from the Triassic Period onward. • The French zoologist Henri de Blainville gave them their modern name in 1830. • American ecologist Robert Paine described the starfish as a keystone species in 1966. • Scientists from New Zealand agreed with his conclusion in 1971. • In 2009, scientists discovered some starfish adapting surprisingly easily to rising ocean temperatures and acidity. • A genetic study in 2012 discovered that starfish evolution continues to this day. • Scientists in 2014 isolated a virus causing widespread wasting sickness among various starfish species. • The starfish live in various ocean habitats, from warm tropical waters to icy polar waters. • The starfish can regrow any lost limb. • Scientists have studied the starfish’s regenerative ability as part of research into stem cells. • Starfish quickly expel foreign objects from their bodies, making it hard for scientists to track them with implanted radios like with other animals. • Starfish fossils make up some of the world’s rarest, thanks to their fragile bodies. Antarctic Sun Starfish Image from Wired Also known as the wolftrap starfish,...

Grab your snorkels, gang, and join us as we discover the secrets of one of the ocean’s most peculiar creatures! Ready? Then check out our fascinating starfish facts… Phylum: Echinodermata Family: Asteriidae
Classification: Invertebrate IUCN status: Not Evaluated Lifespan (in wild): 35 years Weight: Up to 5kg Body size: 1-65cm, depending on species Diet: Carnivore Habitat: Ocean Range: First things first – despite their common (and very misleading!) name, starfish (or sea stars) are actually fish. Since they don’t have a backbone, they belong to a group of species called invertebrates, which also includes urchins and sponges. There are around 1,600 different species of starfish living in the world’s oceans, where they occupy every type of habitat including tidal pools, rocky shores, sea grass, kelp beds and coral reefs. Some kinds of starfish are even found on sandy seabeds 9,000 metres deep! 

Most starfish sport spiny skin and five arms surrounding a central disk-shape body – although some can grow as many as 50 arms. Their arms are covered with pincer-like organs and suckers that allow the animal to slowly creep along the ocean floor. They also have eyespots on the tips of the arms, which allow the starfish to sense light and dark, and help it find food. Favourites on the starfish’s menu include mollusks like clams, oysters and snails. And it has a pretty impressive way of eating! After attaching its body to the chosen prey, the starfish extends its stomach ...