Starfish
Starfish look like stars, but they aren’t actually fish. They’re a type of invertebrate called an echinoderm.
Starfish are able to engage in a behavior known as “eversion” which involves the starfish’s stomach extending outside of its body through its mouth, in order to consume and digest prey.
Some starfish can regenerate arms if one is torn off. Some species can even regrow a completely new central disc from a single arm.
Starfish cannot live in fresh water, but they live in all of the world’s oceans. Some species inhabit depths of over 20,000 feet.
Starfish are predators, and often eat sponges, snails and other invertebrates.
Most species of starfish reproduce via mating between a male and female. Some species are hermaphroditic, meaning an individual starfish contains both male and female reproductive organs. Some start life as males before becoming females in older age. Still other species of starfish are able to reproduce by splitting parts of their body off and regenerating a new organism from the separated parts.
Starfish are invertebrates called echinoderms who live in marine environments. They get their name from their shape, which often resembles that of a 5-pointed star.
The starfish’s body is comprised of a central disc and a number of arms. Usually they have five arms, though some species may have many more than that.
Starfish use their tube feet (small tube-like structures on their arms) to maneuver along the sea floor in search of food.
Starfish have been around for at least 450 million years. There are believed to be nearly 2,000 species alive today, in seven different orders.
Starfish factor into the mythologies of aboriginal Australians and native Hawai’ian cultures.
The diversity of starfish species means that some species populations are doing better than others. However, all are vulnerable to ocean pollution. Starfish are often regarded as “keystone species” which scientists can use to determine the overall health of a given environment.
The star-like shape of starfish has led them to be collected, dried, and sold as souvenirs in many coastal towns. This has harmed starfish populations of some species that were once plentiful, and in some areas the local species have become endangered due to overcollection.
In some areas, starfish can cause damage as invasive species, or when their population grows too quickly (which is known as an “irruption”). The Great Barrier Reef in Australia has been greatly harmed by the irruption of the crown of thorns starfish, which consumes coral and, when its population grows out of control, can severely damage coral reefs.
References
https://en.wikipedia.org/wiki/Starfish
https://ocean.reviverestore.org/threats-solutions/marine-threats/invasives/
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