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Criteria for New System of Classification > Body Cavity (Coelom)

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Maharashtra State Board: Class 10

Key Points: Body cavity (Coelom)

No. Type of Coelom Body Cavity Formation Examples
1 Eucoelomates True coelom from mesoderm Annelida and higher phyla
2 Acoelomates No body cavity Porifera, Cnidaria, Platyhelminthes
3 Pseudocoelomates Cavity not fully from mesoderm Aschelminthes
CBSE: Class 12

Key Points: Classification Based on Body Cavity

  • The body cavity (coelom) is the space between the body wall and the gut, and is important for classification.
  • True coelom is lined by mesoderm, while the absence or incomplete lining leads to other types.
  • Acoelomates lack a body cavity; examples include Porifera, Cnidaria, Ctenophora, and Platyhelminthes.
  • Pseudocoelomates have a body cavity not fully lined by mesoderm; example: Aschelminthes.
  • Coelomates have a true coelom; examples include Annelida, Arthropoda, Mollusca, Echinodermata, Hemichordata, and Chordata.
  • This classification helps in understanding body organisation and the evolutionary advancement of animals.
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