Distinguish between diploblastic & triploblastic animals.

Diploblastic: Animals in which the embryo have two embryonic tissue layers or germ layers i.e. ectoderm and endoderm are termed as diploblastic. Coelom is absent. Examples: Sponges, coelenterates and cnidarians Triploblastic: Animals in which the embryo have three embryonic tissue layers or germ layers i.e. ectoderm, mesoderm and endoderm are termed as triploblastic. Coelom is present. Examples: Mammals, birds, reptiles read less

Diploblastic: 1. Body wall develops from two embryonic germ layers- ectoderm and endoderms and persists as such in adult. 2. Non- cellular, gelatinous mesogloea is present in between ectoderm and endoderm. 3. Coelom is absent, e.g. Hydra (coelenterates), sponges (Porifera). Triploblastic: 1. Body develops from 3 germ layers- ectoderm,mesoderm and endoderms. 2. Mesogloea is absent and mesoderm is present. 3. Coelom is present, e.g. platy-helminthes, annelids, arthropods, mollusks, echinoderms and choradates. read less

There are many differences but the major and speciifc difference is the present of diploblastic or triploblastic stage during embryonic development. Hence, in diploblastic animals there are two membranes, outer exoderm and inner endoderm, where as in the triploblastic animals there are three distinct membranes, outer exoderm, middle mesoderm and innermost endoderm. Various organs then originate from these membranes, say for example nervous system originates from exoderm primarily whereas connective tissues such as blood, muslces etc arise from the mesoderm. In diploplastic animals the space between the exoderm and endoderm may occupied by other components say mesoglea. But there is no third distinct membrane. In triploblastic animals, later higher in the order we will find the development of coelome. read less

Diploblastic: 1. Body wall develops from two embryonic germ layers- ectoderm and endoderms and persists as such in adult. 2. Non- cellular, gelatinous mesogloea is present in between ectoderm and endoderm. 3. Coelom is absent, e.g. Hydra (coelenterates), sponges (Porifera). Triploblastic: 1. Body develops from 3 germ layers- ectoderm,mesoderm and endoderms. 2. Mesogloea is absent and mesoderm is present. 3. Coelom is present, e.g. platy-helminthes, annelids, arthropods, mollusks, echinoderms and choradates. read less