Characteristic features of coelom, Biology

Characteristic Features of Coelom

  • Sensory system consisting of eyes, photoreceptor cells, statocysts, taste buds and tactile organs.
  • Respiration by skin, gills or parapodia.
  • Body vermiform, bilaterally symmetrical with metamerism.
  • Chitinous setae present
  • Schizocoelic coelom - coelom appearing as a split or cavity within mesoderm.
  • Blood vascular system closed, often along with retory pigments; plasma contains
  • Sexes may be separate, or animals may be hermaphrodites. Cleavage spiral, with mosaic development. When present, larva is trochophores. Some animals show asexual reproduction by budding.
  • Presegmental prostomium and post segmental pygidium.
  • Nervous system contains a supraesophageal ganglion (cerebral ganglion). Circum oesophageal ring and ventral nerve cord with segmental ganglia.
  • Excretory system usually consisting of a pair of nephridia in each segment.
  • Different degrees of cephalization are shown.
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