In which of the following phylum, would you place an animal with a bilaterally symmetrical, triploblastic body without a true internal cavity (coelom) ?
Porifera
Platyhelminthes
Cnidaria
Annelida
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UPSC CAPF – 2020
An animal with a bilaterally symmetrical, triploblastic body without a true internal cavity (coelom) would be placed in the phylum Platyhelminthes.
Phylum Platyhelminthes (flatworms) are characterized by bilateral symmetry and being triploblastic (having three germ layers: ectoderm, mesoderm, and endoderm). They lack a true coelom, meaning they are acoelomate โ the space between the body wall and the digestive tract is filled with mesodermal tissue.