The three types of animals you mentioned – acoelomates, pseudocoelomates, and coelomates – are defined by the type of body cavity they possess. Acoelomates are animals that lack a body cavity, while pseudocoelomates have a body cavity that is not completely lined by mesoderm, the middle layer of cells in an embryo. Coelomates, on the other hand, have a body cavity that is completely lined by mesoderm.
The endodermal tissue is a type of tissue found within the body of animals. It is one of the three primary germ layers that forms during the early stages of animal development. In acoelomates, the endodermal tissue is found along the digestive tract, where it forms the lining of the gut. In pseudocoelomates, the endodermal tissue also forms the lining of the gut, but it may also be found in other parts of the body cavity. In coelomates, the endodermal tissue forms the lining of the gut and may also be found in other organs, such as the liver and pancreas.
Overall, the main difference between the endodermal tissues in acoelomates, pseudocoelomates, and coelomates is their location and distribution within the body. In acoelomates, the endodermal tissue is found only along the gut, while in pseudocoelomates and coelomates it may be found in other parts of the body cavity and in specific organs.