Triploblastic, bilaterally symmetrical acoelomates among the following are
Members of phylum Platyhelminthes are commonly called Flatworms. Flatworms are bilaterally symmetrical, triploblastic and acoelomate animals with organ level of organisation. Examples : Taenia (Tapeworm), Fasciola (Liver fluke).
Aurelia and Obelia (Coelenterata) are diploblastic and radially symmetrical.