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Wednesday, September 30, 2020

Phylum Arthropoda -Biology

Phylum Arthropoda

Fig: Apis (Honey Bee)

Important Characteristics:

  • It is the largest phylum of Animalia.
  • Exhibit organ-system level of organization.
  • Bilaterally symmetrical, triploblastic, segmented & coelomate animals.
  • Metamorphic segmentation as in annelids but segmented not separated from each other by septa.
  • All arthropods have an exoskeleton of a chitinous cuticle. 
  • The process of casting off of skin or integument is known as ecdysis or molting.
  • The body is divisible into the head, thorax & abdomen or divisible into cephalothorax and abdomen.
  • Arthropods have an open circulatory system. The body cavity is known as hemocoel (hemocoel), is filled with fluid hemolymph.
  • Respiration takes place through the general body surface & gills in crustacean; through trachea in insects, Diplopoda, Chilopoda; through book lungs in Arachnida.
  • Excretion is brought about by green glands in aquatic forms & Malpighian tubules in terrestrial forms.
  • Sexes usually separate; Fertilization internal; oviparous or ovoviviparous; development direct or indirect.
  • Example: Apis (Honey bee), Bombyx (Silkworm), Laccifer (Lac insect).



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