Phylum- Echinodermata
1. Calcareous spines are present on the body of these animals; hence they are called as
echinoderms.
2. These animals are found only in ocean.
3. Their body is triploblastic, eucoelomate. And it is radially symmetrical in adult
stage. However, they show bilateral symmetry in larval stage.
4. They perform locomotion with the help of tube-feet. Tube feet are also useful for
capturing the prey. Some animals are sedentary.
5. They have skeleton made up of calcareous spines and/or ossicles (plates).
6. These animals have good ability of regeneration.
7. These animals are mostly unisexual.
Examples: Star fish, sea-urchin, brittle star, sea-cucumber, etc.
Star fish
Sea-cucumber
Sea-urchin
Answers
Answer:
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Echinoderm is the common name given to any member of the phylum Echinodermata (from Ancient Greek, ἐχῖνος, echinos – "hedgehog" and δέρμα, derma – "skin")[2] of marine animals. The adults are recognizable by their (usually five-point) radial symmetry, and include starfish, sea urchins, sand dollars, and sea cucumbers, as well as the sea liliesor "stone lilies".[3] Echinoderms are found at every ocean depth, from the intertidal zone to the abyssal zone. The phylum contains about 7000 living species,[4] making it the second-largest grouping of deuterostomes (a superphylum), after the chordates(which include the vertebrates, such as birds, fishes, mammals, and reptiles). Echinoderms are also the largest phylum that has no freshwater or terrestrial (land-based) representatives.