Information about ten examples in phylum echinodermata
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starfish, sea cucumber, brittle star, sea urchin. blastoid ,crinoid.
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Characteristics of Echinodermata
Habitat: These are exclusively marine
Grade of organization: organ system grade
Germ layer: triploblastic
Symmetry: Adults are radially symmetrical while the larvae are bilaterally symmetrical.
Coelom: present ( coelomate)
Body without segmentation
The shape of the body is flat, star like, spherical or elongated.
Head is absent
Presence of tube feet
Presence of water vascular system
Respiration: by papule, gills or clocal respiratory tree
Nervous system: absent, they are brainless organism.
Circulatory system: is reduced, heart is absent
Blood has no pigment.
Digestive system: complete
Excretory system: absent.
Examples -
Asterias (Star fish), Zoraster, Oreaster,Ophiderma, ophiothrix, Astrophyton, Amphuria,Echinus (Sea Urchin),Cidaris,Cucumeria,Holothuria,Neometra etc.
Hope it helps
Habitat: These are exclusively marine
Grade of organization: organ system grade
Germ layer: triploblastic
Symmetry: Adults are radially symmetrical while the larvae are bilaterally symmetrical.
Coelom: present ( coelomate)
Body without segmentation
The shape of the body is flat, star like, spherical or elongated.
Head is absent
Presence of tube feet
Presence of water vascular system
Respiration: by papule, gills or clocal respiratory tree
Nervous system: absent, they are brainless organism.
Circulatory system: is reduced, heart is absent
Blood has no pigment.
Digestive system: complete
Excretory system: absent.
Examples -
Asterias (Star fish), Zoraster, Oreaster,Ophiderma, ophiothrix, Astrophyton, Amphuria,Echinus (Sea Urchin),Cidaris,Cucumeria,Holothuria,Neometra etc.
Hope it helps
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