Question 12 body cavity........ 12. Body cavity is the cavity present between body wall and gut wall. In some animals the body cavity is not lined by mesoderm. Such animals are called a. Acoelomate b. Pseudocoelomate C. Coelomate d. Haemocoelomate Share with your friends Share 0 Mehvash Shams answered this Dear student,option a is correct.Such animals are called acoelomate. 0 View Full Answer