By the broadest definition, a body cavity is any fluid filled space in a multicellular organism. However, the term usually refers to the space, located between an animal’s outer covering (epidermis) and the outer lining of the gut cavity, where internal organs develop.
The type of body cavity places an organism into one of these three groups:

Phyla - Berkeley's introduction to the pseudocoelomate or Aschelminth group of phyla.
Evolutionary Relationships of Rotifers and Acanthocephalans - A review of various proposed cladograms showing the interrelationships of the pseudocoelomates.
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