Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea. 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.

  • SCIENTIFIC NAME: Asteroidea
  • CLASS : Asteroidea; Blainville, 1830
  • PHYLUM : Echinodermata
  • KINGDOM : Animalia
  • SYMMETRY : A typical starfish has five-sided symmetry. With no clear head, the starfish can move in any direction, led by any one of its five arms, .. Starfish belong to a group of animals called echinoderms, which also include sea urchins, sea cucumbers, brittlestars. As adults, most of the group have five-sided symmetry.
  • HABITAT : Sea stars occupy every type of habitat, including tidal pools, rocky shores, sea grass, kelp beds, and coral reefs. Some sea stars even live in sands as deep ad 20,530 feet (9,000 meters). Sea stars aren’t social creatures, but they will congregate in large groups during certain times of the year to feed.
  • COLORS : Many species are brightly colored in various shades of red or orange, while others are blue, grey or brown. Starfish have tube feet operator by a hydraulic system and a mouth at the center of the oral or lower surface. They are opportunistic feeders and are mostly predators on benthic invertebrates.
  • NUMBER OF LEGS : The one odd man out is the starfish. Most of these prickly, scratchy ocean friends have 5 legs. But there are over 1.800 types of starfish, or “species”, and they don’t have to have just 5 legs- they can have up to 50! even with all those legs, if a starfish loses one, it can just grow a new leg through regeneration. .

Starfish do not attack humans, but can inflict painful strings with the release of venom, when they are accidently stepped upon or handled. A lot of people wonder if starfish are dangerous because they have spikes. The answer is no, starfish are not poisonous at all and their spikes can’t hurt you unless it pierces your skin-or if the spike has a venomous substance on them which only happens in some species of sea stars like urchins

This is what happens when we lift starfish out of water, since fresh air is toxic for their respiratory system, .. Most starfish species can only hold their breath for less than 30 seconds, 5 minutes out of water is simply a kind of death sentence to them, even if it is an ‘instagramable’ death.

Because sea stars have no teeth , they cannot chew. They must make their food soupy before they can eat it.

Photo by Mark Walz on

Despite having five very noticeable limbs ( which have regenerative properties ), starfish actually walk using thousands of cilia on the bottoms of their bodies. And, as the video show, they can move at decent speed.. for starfish. They do not have gills, scales, or fins. Sea stars live only in saltwater. Sea stars are related to sand dollars, sea urchins, and sea cucumbers, all of which are echinoderms, meaning that they have five-point radial symmetry. Starfish reproduce sexually by spawning. Spawning means that the sex cells are released into the water. When starfish spawn, the males release sperm and the females releases eggs in the great numbers. Female starfish may release millions of tiny eggs into the water during a spawning session.

But some starfish do have teeth!. Since most starfish feed using their stomachs, there’s no bite and chew the same way that say, a dog might. But there are some starfish that have a lot of spines located around their mouth that might be important to helping them eat.

We can eat starfish, and many times in china’s food markets, you will find them being served on a stick. Not too many people eat them because to some, their taste is not appealing. It has been said that they taste like a sea urchin but a bit more bitter and creamier. Some say they taste like ocean water.


  1. They have no brain and no blood.
  2. They can live up to 35 years.
  3. Starfish is not their right name, they should always be called sea star!
  4. There are around 2,000 species of sea star.
  5. They cannot survive in fresh water.
  6. They can regenerate.
  7. They eat inside out.
  8. Sea stars Reproduce two ways.
  9. Brittle stars are the sea stars’ cousins.
  10. They can have up to 40 arms!

Many different animals eat sea stars, including fish, sea turtles, snails, crabs, shrimps, otters, birds and even other sea stars. Though the sea star’s skin is hard and bumpy, a predator can eat it whole if its mouth is large enough. Predators with smaller mouths can flip the sea star over and eat the softer underside. If the starfish is not surgically removed, the stomach will rupture, which can result in death. Most animals can safely eat starfish because the secrete logisterase, which protects the enzyme as the starfish is safely digested.

A starfish has eyespots that cannot see much in the way of details but can detect light and dark. These eyespots are at the tip of each of the starfish’s arms.