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Aschelminthes (roundworms) are pseudocoelomates, meaning their body cavity is partially lined with mesoderm.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Pseudocoelomate body plan shows variation among Aschelminthes. In Nematoda body wall comprises resistant collagenous cuticle, syncytial hypodermis and only longitudinal muscle layer, circular muscle absent, enclosing fluid-filled pseudocoel at high turgor functioning as hydroskeleton. Musculature restricted to outer peripheral position muscles lie only on outer side of pseudocoel not lining gut. Contrasts with true coelomates where muscle layers border both sides of coelom. High internal pressure enables undulatory thrashing locomotion. Hence animal exhibiting pseudocoelom with muscle solely p
Ref: NCERT Class 11 Biology, Chapter 4: Pseudocoelom Nematoda muscles; Campbell Chapter 33
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