Echinoderms are marine animals with radial symmetry. Some types of echinoderms are sea stars, sea urchins, sand dollars, and sea cucumbers.

1,609 Questions

Is a hydra an echinoderm?

Echinoderms are characterized by radial symmetry, several arms (5 or more, mostly grouped 2 left - 1 middle - 2 right) radiating from a central body (= pentamerous). The body actually consists of five equal segments, each containing a duplicate set of various internal organs. They have no heart, brain, nor eyes, but some brittle stars seem to have light sensitive parts on their arms. Their mouth is situated on the underside and their anus on top (except feather stars, sea cucumbers and some urchins).

Echinoderms have tentacle-like structures called tube feet with suction pads situated at their extremities. These tube feet are hydraulically controlled by a remarkable vascular system. This system supplies water through canals of small muscular tubes to the tube feet (= ambulacral feet). As the tube feet press against a moving object, water is withdrawn from them, resulting in a suction effect. When water returns to the canals, suction is released. The resulting locomotion is generally very slow.

therefore, no. hydra supposedly had heart, brain and eyes and also do not have tentacles.
No, it's a Cnidarian


What distinctive features do all modern echinoderms share?

They are radially symmetrical, there is no cephalization ( no heads ) and they are, like you deuterostomes. ( indeterminate cleavage and a mouth that does not arise from the blasophore ).

Also, they are all marine animals and they have spiny skin.


This echinoderm burrows in the sand?

sand dollar


Which feature would you find on an echinoderm?

novanet: an endoskeleton you cheaters get back to work


Are Echinoderms habitat aquatic or land?

In my personal opinion, they could be either.

But, in my professional opinion, Echinoderms habitat would have to be neither; because they are a type of germ (it would have to be air).


What does silly sally sat by the seashore sunning with starfish mean?

It doesn't mean anything, it is just a fun tongue-twister.


What happens to echinoderm larvae when they metamorphose into adults?

Echinoderms have swimming larvae that are bilaterally symmetrical, with left and right sides, but they do not 'develop into' bottom-living adult echinoderms, which are radially symmetrical, often star-shaped. The juvenile (young adult), radial from the start, grows from a group of stem cells within the larva. It gradually moves to the outside of the larva, and the larva and juvenile develop side-by-side. In most cases, the larva eventually settles and shrivels, and the juvenile crawls away. In one species of starfish, however, the juvenile drops off the swimming larva, which can go on swimming for a further three months.


Are sponges echinoderms?

No. Sponges belong to the phylum Porifera, which means 'pore bearing.' The have pores that are called incurrent vents, where water comes in, and excurrent vents, where water goes out. They are considered the most primitive of animals because they don't have any complex organs or tissues, so, for example, they don't have a circulatory system or a digestive system or a nervous system. Their cells are somewhat loosely structured in that some cells can move around from place to place in the sponge and there are some unspecialized cells that can become other kinds of cells. Also, they only have two layers of cells. There are some types of sponges that you can put through a sieve to separate all the cells but then the cells will go back together to recreate a sponge again.

Echinoderms are a completely different and more advanced phylum. They have organ systems and fixed (non-changing) cell types and more layers of cells. Also, if you put an echinoderm through a sieve, he's a gonner.


What is an echinoderm?

An echinoderm is a sea animal that has a hard spiny shell, or exoskeleton. Echinoderms display radial symmetry, having 5 similar body extensions from a central point.

The seven classes of echinoderms are brittle stars, basket stars, sea urchins, sand dollars, sea lilies, feather stars, and sea cucumbers.


What adaptations have echinoderms developed to survive?

echinoderms only come out in the dark so other animals don't see them.


How long do echinoderms live?

10 to 15 years


How can echinoderms survive without a head?

Echinoderms have all the same organs as are normally found concentrated in the head only they have them scattered. So what if their eyes are on their legs if they still see. It is the seeing that is important, not the location of the eyes.


What kind of behaviors do echinoderms have?

Chiken is good


What are the examples of echinoderms?

There are over 6000 types of echinoderms. A few examples are the banded-arm brittle star, common sea urchin, cushion sea star, etc. I you were looking for types of echinoderms, they are

  • Sea star or starfish (Asteroidea)
  • Brittle stars, basket stars, serpent stars (Ophiuroidea)
  • Sea urchins, heart urchins and sand dollars (Echinoidea)
  • Holothurians or sea cucumbers (Holothuroidea)
  • Feather stars and sea lilies (Crinoidea).

In echinoderms could fertilization take place without water?

No because the sperm and egg cells have to be released into the water where the eggs are usually fertilized. :) ☆彡 NEON STAR


What do echinoderms and chordates have in common?

they both have spinal cords


Are echinoderms autotrophic?

Echinoderms are not autotrophic because it gets its food and energy using its feet. The definition of autotrophic is an organism that can produce its own food.


What are the five echinoderm classes?

The 5 living classes of echinoderms are Asteroidea (sea stars) Crinoidea (sea lillies) Echinoidea (sea urchins and sand dollars) Holothuroidea (sea cucumbers) Ophiuroidea (brittle stars and basket stars)


What is an example of an echinoderm?

Sea star, sea urchin and also sea cucumbers.


How do echinoderms reproduce?

They reproduce asexually and sexually. After the female releases her eggs the male lets out a sperm which fertilizes the eggs.

Asexually probably by budding!

A few species provide some nurturing of the young.

Fiat Punto
Animal Life

Fiat punto overheating?

The first thing you should do is check for an airlock in the cooling system, this is easy to do and costs you nothing, a severe airlock can stop the temperature sensor from allowing the cooling fan to kick in when its needed. I have found most puntos airlock in and around the heater matrix, one tell tale sign is if the engine is overheating and you switch the interior heater on the air blows luke warm for a few seconds then blows cold. Most people including alot of garages would then tell you the head gasket has gone and and charge a fortune to replace it.

The procedure:

Make sure the engine is cold or the car has been standing for at least 3/4 of an hour.

Follow the top hose from the radiator back towards the bulkhead, you will see two 25mm dia rubber pipes going into the bulkhead these are the hoses for the heater, Just before they go into the bulkhead there is one bleed screw on each hose. Undo both screws, you maybe able to do this by hand otherwise use a flat screwdriver.

Remove the filler cap from water tank on the side of the radiator. Does water trickle from the bleed holes?

If not replace the filler cap and start the engine allow to warm up this may take a few minutes. do you see any water coming from the bleed holes, if you see no water when the temperature gauge is just above half way or if steam is coming from the holes, you have a sever airlock.

Switch off the engine. and allow to cool.

Remove the filler cap from the water tank and fill to top using either a hose or watering can. Start the engine again with the filler cap off the water should be sucked from the filler tank around the system forcing the airlock out of the bleed screw holes. Top up The filler tank as this happens. Once you see water squirting (not trickling) from both bleed holes. Stop the engine and replace on bleed screw. Restart the engine allow water to kepp coming out of the second bleed screw until the water in the filler tank is at the normal level.

Stop the engine and replace the other bleed screw. Replace the cap on the filler tank.

Start engine and allow to warm up if the problem was an airlock the temperature will rise slowly and the fan will kick in when required. Turn the heater on when the car is at normal running temperature the air should now be constantly warm.

Hopefully that's the problem cured and you still have £350 in your pocket rather than the garage till.

This is my experience only, don't attempt any of the above if you are a complete numpty, I wouldn't want to see anyone get hurt. Regards Average Joe.


How do echinoderms eliminate nitrogenous wastes?


What are echinoderms eating habits or diet?

Echinoderms eat a variety of sea life. Depending on the type of echinoderm dictates its diet. Many eat snails, sea urchins, barnacles, mussels and clams. They use their feet to suck open a shell such as a clam, and then put their stomachs over the opening to suck out their meal.(:

Glad i Could Help .


What are facts about echinoderms?

Echinoderms are made up of starfish, sea cucumbers, brittle stars, sea urchins, etc.

Echinoderms are organisms in the phylum Echinodermata, which is Latin for "spiny-skinned."

Echinoderms have radial symmetry, which means that you can divide them into sections with a central point like spokes on a wheel (ex. divide them into eight equal sections), and each section would be the same. To better understand this, see the question "What is radial symmetry?"

Echinoderms live in the ocean.

Echinoderms don't have hearts or brains.

Echinoderms have tube feet, which are similar to suction cups. The tube feet stick on to surfaces or prey.

This answer is more relevant than the previous one, which stated "I'll put the answer later. Here's an interesting poem: Fleas


Had 'Em"
we learned about that in science
we learned about that in science


How do echinoderms protect itself?

Echinoderms include sea urchins, sea stars and starfish. The meaning of echinoderm is 'spiny skin'. Therefore one method of protection is spines that can break off in a potential predator and cause irritation, some species such as the crown of thorns starfish have poisonous spines. Tough skin puts of other predators. Most echinoderms have remarkable self restoring abilities; the starfish can regrow itself from a small piece of its body as long as that piece contains a sufficient portion of its 'mouth and water vascular system' (i.e. the centre bit of the star).


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