Question

Differentiate between triploblastic and diploblastic body wall?

Answer 1

Hint: The development of germ layers and body cavities as well as complexity found in the species helps to assess the category of an organism.

Complete answer:

Diploblastic body wall	Triploblastic body wall
Diploblastic animals during gastrulation develop two main germ layers, the endoderm and the ectoderm. Includes external layer (ectoderm), internal layer (endoderm).	Three primary germ layers, endoderm, ectoderm and mesoderm are formed by triploblastic animals.
A mesoderm is absent from diploblastic species.	Mesoderm allows the production of true organs, muscle types, bone, connective tissue, circulatory system, notochord, etc.
There is a non-living layer in between the endoderm and the ectoderm. This layer is often gelatinous and is known as mesoglea. Mesoglea is noticeable and helps protect the body and the gut line.	Mesoglea is absent.
Diploblastic animal endoderm contains the true tissues and intestines.	Triploblastic animal endoderm include lungs, stomach, colon, liver, urinary bladder, etc.
The diploblastic animal ectotherms form epidermis, nervous tissue, and nephridia.	Triploblastic animal ectoderm forms epidermis, blood, eye lens, brain, spinal cord and so on.
Diploblastic species are symmetrical radially. Diploblastic animals have no brains. Animals with diploblasts are not complex.	The triploblastic animals are symmetrical bilaterally. Triploblastic animals are very diverse compared with diploblastic animals.
Coelom (does not have cavities in the body) is absent.	Coelom (developing a body cavity) is present.
Cnidaria and Ctenophora are known to have diploblastic properties. Examples of diploblastic species include jellyfish, comb jellies, corals, and sea anemones.	Examples of triploblastic animals include platyhelminthes, annelids, arthropods, molluscs, echinoderms, and chordates.

Additional information:
Furthermore, triploblastic organisms are further broken down into parts such as acoelomates, eucoelomates and pseudocoelomates. Acoelomates lack a coelom while eucoelomates are a true coelom. Pseudocoelomates consist of a false coelom. Eucoelomates can be divided into two groups once again: protostomes and deuterostomes. Protostomes develop blastopore mouth while the deuterostomes develop blastopore anal opening.

Note: Diploblastic animals are thought to have given birth to triploblastic animals around 580 to 650 million years ago. Therefore, the evolution of the level of complexity within these animals have been observed.