The animals of which phylum are also called aceolomate
Answers
Answer:
Diploblastic animals have two cell layers to their bodies, an outer Ectoderm and an inner Endoderm, between these two layers may be an amount of noncellular material. Triplobastic animals have 3 cell layers in their bodies, Ectoderm (Outer layer) Mesoderm (middle layer) and Endoderm (inner layer), simpler animals have only 2 cell layers in their bodies and are called diploblastic. Body cavities of any sort only exist in triploblastic animals. These layers form in the embryo during a process called gastrulation and later give rise to different parts of the body. Thus the Ectoderm will eventually become, the epidermis of the skin, sweat and sebaceous glands, epidermal coverings (hair, feathers, scales, horns etc.) and the nervous system including those parts of the sense organs that are sensory, rather than supportive. The mesoderm gives rise to the skeleton, the muscles, the dermis of the skin, blood and blood vessels, mesenteries and the lining of the coelomic cavity. From the endoderm arise the lining of the guts, lungs and urethra as well as the urinary bladder, the thyroid, parathyroid and thymus and the secretory parts of the liver and pancreas.
Answer:
Acoelomate animals are called acoelomates and they have no true body cavity. The acoelomate phyla are Placozoa , Porifera , Cnidaria , Ctenophora , Platyhelminthes, Mesozoa, Nemertina, Gnathostomulida. Pseudocoelomate animals have a pseudocoelom. They have a body cavity but it is not lined with mesodermal cells.