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प्रश्न
Give an account on the classification of invertebrates with few general features and examples.
उत्तर
Invertebrates are animals without a backbone. The invertebrates have been classified into various phyla as follows:
| S.No | Division | Examples | General Characters |
| 1. |
Phylum Protozoa |
Eg. Amoeba, Euglena p |
Microscopic unicellular, pseudopodia, flagella and cilia for locomotion, reproduce by fission or conjugation. |
| 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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