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Phylum Echinodermata and Phylum Hemichodata (in Hindi)
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In this session we have completed phylum Echinodermata and phylum hemichordata in depth for NEET and AIIMS entrance exam and CBSE board exam.

Anmol Sharma is teaching live on Unacademy Plus

Anmol Sharma
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  2. WHAT TO STUDY? Basis of Classification Levels of Organisation . Symmetry .Diploblastic and Triploblastic Organisation (Germ Layer) . Coelom Segmentation Notochord . Classification of Animals . Phylum Porifera Phylum Colenterata Phylum Ctenophora . Phylum Platyhelminthes .Phylum Aschelminthes Phylum Annelida Phylum Arthropoda . Phylum Mollusca Phylum Echinodermata Phylum Hemichordata . Phylum Chordata

  3. * Class Chonarichythyes * Class Amphibia . Class Aves Class Cyclostomata Class Osteichthyes Class Reptilia . Class Mammalia Key Point of Animal Kingdom

  4. Phylum - Echinodermata Ihese animals have an endoskeleton of calcareous ossicles and, hence, the name Echinodermata (Spiny bodied) Habitat All are marine Symmetry - The adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical * Digestive system - complete with mouth on the lower (ventral) side and anus on the upper (dorsal) side

  5. Water vascular system - distinctive feature Helps in locomotion, capture and transport of food and respiration. Excretory system - absent. Reproduction - Dioecious animals . Reproduction is sexual. * Fertilisation - usually external. .Development - indirect with free-swimming larva. Examples: Asterias (Star fish), Echinus (Sea urchin), Antedon (Sea lily), Cucumaria (Sea cucumber) and Ophiura (Brittle star)

  6. Phylum - Hemichordata Earlier considered as a sub-phylum under phylum Chordata, but now it is placed as a separate phylum under non-chordata Habitat - consists of a small group of worm-like marine animals. . Level of organization, symmetry, body cavity organ-system level of organization, bilaterally symmetrical, triploblastic and coelomate animals Body shape and division - The body is cylindrical and is composed of an anterior proboscis, a collar and a long trunk. Body shiape and division The ooty .

  7. Circulatory system - Open type Respiration - through gills . Excretory organ - proboscis gland . Reproduction, fertilisation, development- Diocious animals, external Fertilisation, indirect Development. Examples: Balanoglossus and Saccoglo SSUs.

  8. Figure : Balanoglossus Source This image is from NCERT Textbook Page no. 54

  9. Thank You