Kingdoms Plantae and Animalia: Major Phyla Included in Kingdom Animalia (For CBSE, ICSE, IAS, NET, NRA 2022)

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Major Phyla Included in Kingdom Animalia

  • Phylum Porifera (Includes sponges) : All are marine and non-motile organisms fixed to the solid surface. The body has many pores, canals and chambers through which water flows. Large aperture called osculum at the upper end. Body encloses a large cavity called sponocoel. Reproduce asexually by budding and by sexually through fertilization. Examples: Sycon, Euplectella, Euspongia, Spongilla, Leucosolenia, etc.
Image Showing Phylum Porifera; (A) Sycon; (B) Euplectlella; …
  • Phylum Cnidaria (Includes hydroids, jelly fishes, sea anemone, corals) : Body with no head and no segmentation. These animals have germ layers; ectoderm and endoderm, one layer makes up cells on the outer side of the body (epidermis) and other layer makes the inner lining of the body (gastrodermis) . Body contains tentacles. They contain nematocysts called Cnidoblasts. Reproduction may be asexually or sexually. Examples: Hydra, Obelia, sea anemone, Aurelia, etc.
Image Showing Exmaples of Cnidaria; Sea Anemone and Hydra
  • Phylum Platyhelminthes (Flat worms) : These are first triploblastic animals. Body is bilaterally symmetrical, elongated and dorsoventrally flattened. They possess a mouth but no anus. They either free living or parasitic or hooks or both for attachment to the body of the host. Reproduce by mostly sexually and few asexually. Examples: Planaria, tapeworm, liver fluke, etc.
Image Showing Example of Phylum Platyhelminthes
  • Phylum Aschelminthes (Class nematoda) : Triploblastic animals (3 germ layers) . Body is bilaterally symmetrical and body cavity is a pseudocoelom. Organisms are mostly parasites having slender, elongated bodies, tapering at each end. It has a mouth, pharynx, intestine and anus. Sexes are separate, males smaller than females. Ascaris is a common round worm living in the intestine of humans. Example: Ascaris, Enterobius, Wuchereria, etc.
Image Showing Example of Phylum Aschelminthes; Ascris and Wu …

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