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Answer» Invertebrates are animals without a backbone. The invertebrates have been classified into various phyla as follows: | S. No | Division | General Characters | | 1. | Phylum protozoa
Eg. Amoeba Euglena | Microscopic unicellular, Pseudopodia, flagella and cilia for locomotion, reproduce by fission or conjgation. | | 2. | Phylum Porifera
Eg. Leucosolenia, Sycon. | Multicellular organisms with holes in the body. Skeleton formed of spicules, asexual and sexual reproduction. | | 3. | Phylum Coelenterata
Eg. Hydra, Jelly fish. | Multicellular organisms Diploblastic, sessile or free swimming, solitary or colonial, asexual and sexual reproduction | | 4. | Phylum Platyhelminthes Eg. Planaria, Liver fuke | Acoelomates, parasites inside the body of animals and human beings, mostly hermaphrodite (bisexual). | | 5. | Phylum Aschelminthes or Nematoda
Eg. Ascaris lumbricoides | Unsegmented body, mostly parasites in human beings and animals, causing diseases, asexual reproduction. | | 6. | Phylum Annelida
Eg. Earthworm, Leech. | Triploblastic, segmented body, mostly hermaphrodite (bisexual and unisexual). | | 7. | Phylum Arthropoda
Eg. Crab, Prawn | Segmented body, thick chitinous cuticle forming an exoskeleton, paired and jointed legs, unisexual exhibits sexual dimorphism. | | 8. | Phylum Mollusca
Eg. Cuttle fish, Snail | Soft bodied, unsegmented, muscular head, foot and visceral mass, mantle, a calcareous shell, sexual reproduction. | | 9. | Phylum Echinodermata
Eg. Starfsh, Sea – Urchin | Exclusively marine, spines and spicules over the body, water vascular system, tube feet, for feeding, respiration and locomotion sexual reproduction. |
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