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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 As the tube feet press against a moving object, water is withdrawn from them, resulting in a suction effect.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.
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What else can I help you with?
What are some characteristics of echinoderms?
they are in the shape of a star
What are the characteristics tha distinguish echinoderms from other phyla?
their body plan
What are the main characteristics and groups of echinoderms?
Echinoderms are invertebrates with an internal skeleton and a system of fluid-filled tubes called a water vascular system. There are four major groups of echinoderms: sea stars, brittle stars, sea urchins, and sea cucumbers.
What characteristics do echinoderm's have?
Echinoderms are invertebrates with an internal skeleton and a system of fluid-filled tubes called water vascular system.
What are the characteristics of 8 groups of invertebrates?
the 8 groups of invertebrates are the arthropods, poriferans, platyheminthes, coelenterates, nematoeds, mollusks, echinoderms, and annelids
What kingdom are echinoderms in?
Echinoderms are in the Animalia kingdom.
What is the scientific name for Echinoderms?
The scientific name for Echinoderms is Echinodermata.
What is example of echinoderms?
Echinoderms can only be found in water, as they are aquatic. Some characteristics of Echinoderms are: Hard Skin, have arms or spines, have 5 body parts, organs found towards centre of body. Examples: Star Fish, Sea Cucumber, Sea Urchin
What phylum do echinoderms belong to?
Echinoderms belong to the phylum Echinodermata.
Echinoderms are parasitic or not?
As of yet, there is no known species of parasitic echinoderms.
Do echinoderms live in salt water?
Yes Eventually echinoderms do live in water.
Which group of invertebrates have a water vascular system and tube feet?
Echinodermates possess a water vascular system.
