Solution:
Acoelomates lack a body cavity.
Pseudocoelomates have a body cavity not lined by mesodermal peritoneum.
Coelomates (schizocoelomates and enterocoelomates) have a body cavity lined by mesodermal peritoneum.
The animals in which the body cavity is not lined by peritoneum is called
Acoelomates lack a body cavity.
Pseudocoelomates have a body cavity not lined by mesodermal peritoneum.
Coelomates (schizocoelomates and enterocoelomates) have a body cavity lined by mesodermal peritoneum.