Characters and Classification of Echinodermata

General characteristics of Phylum Echinodermata
(Echinos: Spines; derma: Skin)
Kingdom: Animalia
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
Tube feet for ocomotion
Presence of water vascular system, which circulate nutrient, gaseous exchange
and eliminatio of waste product.
Mouth is present on ventral side while anus is present on dorsal side
Respiration: by papule, peristomial 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
Sexes: mostly dioecious, rarely monocious
Reproduction:
Sexual: by gamatic fusion
Asexual: regeneration
Fertilization: external
Development: indirect with characteristic larvae
Classification of phylum Echinodermata
It is divided into 5 classes:
Asteroidea
Ophiuroidea
Echinoidea
Holothuroidea
Crinoidea

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Plzz upload video of larval forms of echinoderms

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sir i have question why we study as bipannaria as common larva of echinodermata but as we know different classes of echinodermata have different larva?

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Sir ctenophora phylum k animals v exclusively marine hote hain ....I think 🤔😊

[@DrCLVerma]

Right

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Ctenophora are also Exclusively Marine.

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Echinoderms,larva are bilaterally symmetrical and adults are radially

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