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)