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Echinoderms
Echinoderms are marine animals with radial symmetry. Some types of echinoderms are sea stars, sea urchins, sand dollars, and sea cucumbers.
294 Questions
They don't. They are invertebrates that live on the ocean floor. They have tube feet that they use to shuffle along the sea floor. Sea urchins are echinoderms, but they don't have tube feet. They walk on their spines.
What adaptations have echinoderms developed to survive?
Echinoderm-á¼Ï‡Î¹Î½Î¿Î´ÎÏματα. One adaptation of the echinoderm is that they have spikes and toxins to keep away predators. Echinoderms include: starfish, sea urchins, sand dollars, sea cucumber, feather lilies, and many others. in fact about 5000 known
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What characteristics do all echinoderms have in common?
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.
What kind of behaviors do echinoderms have?
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.(:
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What is the characteristic of echinoderms?
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 As the tube feet press against a moving object, water is withdrawn from them, resulting in a suction effect.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.
2 classes of echinoderms and a member of each class?
There's actually 8 "types"(which i consider classes) of echinoderms we know today, 2 of them are extincted, the 2 extincted ones are homalozoa and helicoplacoidea. The 6 living today are crinoidea(includes sea lilies)asteroidea(which includes star fishes)ophiuroidea(which includes brittle stars) echinoidea (which includes sea urchin)holothuroidea(which includes sea cucumber, which i like to call sea pickles) and last and least, concentricycloidea(which includes sea dasies, the reason they're least is because there's only 2 species of them known so far). If you're talking about sub-phylums of echinoderms, i believe there are 2 of them, i have no idea what the 2 extincted ones go in to, but i think scienctists only classify species that's not dead, the 2 subphylum are pelmatozoa(which includes only crinoidea) and there's eleutherozoa(which includes all of the classes except homalazoa, heli and crinoidea)
How does a starfish affect its environment?
It depends what type of starfish you are talking about and whether it is in its own environment or introduced. If it is in its natural environment, it would eat and be eaten, but if it is an introduced species (e.g. Northern Pacific sea star) it may not have any predators and be competing for food with the native wildlife.
What advantage do free-swimming larvae provide for the echinoderms?
The free-swimming larvae can travel much greater distances than the bottom-dwelling adults, increasing their range. If the environmental conditions for the adults become bad, the larvae can travel to another area that may be more favorable.
How are echinoderms useful to humans?
there are many uses of echinoderms. and i can site some. they can be harvested as food, esp. the holothurians, we also use them as decorations, echinoderms esp. sea urchin are also recently studied in the laboratories bec. biologists believe that they may be of help in discovering medicines for human diseases.
What is an echinoderm that has a large number of spines attached to it?
The sea urchin is a member of the phylum Echinodermataand is covered with spines that may or may not be poisonous.
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
No because an echinoderm is any marine animal of the invertebrate phylum Echinoderm, having a radiating arrangement of parts and a body wall stiffened by calcareous pieces that may protrude as spines and including the starfishes, sea urchins, sea cucumbers, etc.
How long have echinoderms been on earth?
They have been around since the Cambrian Period and a lot of them are extinct.
Do starfish take care of the young?
No. The female releases a large quantity of microscopic eggs out into the water to be fertilized by the male externally. The babies, known as larvae, take about 2-5 years to grow. In all this time, they are not cared for by their parents.
None of the above. Echinoderm refers to a member of the animal phyla Echinodermata, the sister taxon to our own phyla, Chordata.
Do echinoderms have a closed circulatory system?
All vertebrates have closed circulatory systems, meaning that the blood never travels outside of a system of veins, arteries and capillaries.
