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Why are echinoderms grouped with the starfish and sea urchins?
Wiki User
∙ 12y ago
Echinoderms are not 'grouped' with the starfish and sea urchins. Rather echinoderms are the animal phylum to which starfish and sea urchins belong to. Star fish belong to the class Asteroidea and sea urchins belong to the class Echinoidea. There are other echinoderm classes such as sea cucumbers (Holothuroidea) and brittle stars (Ophiuroidea) are two of them. All these classes fall under the Echinoderm phylum.
All echinoderms share some distinguishing features:
1. Their adult bodies are arranged in five equal parts
2. They have an internal calcium carbonate skeleton
3. They have a mouth, but no head or brain (they do have a nervous system)
4. They can posses tube feet for locomotion
5. They posses a internal hydraulic system consisting of tubes of sea water to regulate the body's internal pressure and to control movement feeding and respiration.
Wiki User
∙ 12y ago
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What the meaning of spiny skin animals?
The Spiny skin sea-animals also known as Echinoderms consist of about 6000 species. They are commonly grouped together as starfish and sea urchins.
Are lobsters Ecnoderms?
Echinoderms. No, echinoderms are starfish, sea urchins, and sea cumcumbers. Lobsters are part of the phylum Arthropoda.
What invertebrates are most closely related to humans?
Echinodermata i.e echinoderms - starfish, sea urchins, sea cucumbers
What creature has a radial symmetry?
Most Echinoderms have radial symmetry. Sea Urchins, Starfish, Sand Dollars, etc.
What are erichinoderms?
If you mean echinoderms, the answer is starfish, brittle stars, sand dollars, sea urchins, sea cucumbers, and sea lilies.
What are Sand dollars and sea urchins called?
They, along with starfish, are called echinoderms, pronounced eek-AYE-no-derms.
What are the four major groups of echinoderms?
There are actually four major classes of echinoderms. These are Crinoidea, Asteroidea, Ophiuroidea, Eichionidea, Holothuroidea, and Concentricyloidea. The animals in these range from sea lilies to sea urchins.
Are all echinoderms have the ability to regenerate?
a starfish or something along the line of that
Do mollusks have symmetry?
No, They are bilaterally symmetrical. Radially symmetrical animals include echinoderms (starfish, sea stars, sea urchins) and many plants.
What has a hydrostatic skeleton?
echinoderms (starfish, sea urchins), coelenterates (jellyfish), annelids (earthworms), nematodes, and other invertebrates (snails).
Are startfish arthropod?
No, starfish, sea urchins, sand dollars, and their ilk are echinoderms (phylum echinodermata), a different phylum from arthropoda.
Which phylum do starfish and sea urchins belong to?
Sea stars are in the phylum Echinodermata and the subphylum Asterozoa.
