Biology (NTSE/Olympiad)  

4. Diversity In Living Organism

Phylum - Arthropoda

Phylum - Arthropoda :
Body is covered with a thick chitinous covering.
Respiration through general body surface, by gills, air tubes (tracheae) or book-lungs.
Body segments are grouped into two regions-cephalothorax (head and thorax together and abdomen, or three regions-head, thorax and abdomen.
Triploblastic, bilaterally symmetrical and metamerically segmented animals.
Each body segment usually bears paired lateral and jointed legs or appendages.

Example : Palemon (Prawn), Daphnia (water flea), Limulus (King crab), Palamnaeus (Scorpion)

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