Which one of the following groups of animals is bilaterally symmetrical and triploblastic?
Which one of the following groups of animals is bilaterally symmetrical and triploblastic?
Coelenterates (cnidarians)
Aschelminthes (roundworms)
Ctenophores
Sponges
Solution
Aschelminthes are bilateral symmetrical and triploblastic animals, eg, Ascaris.
Coelenterates are radially symmetrical and diploblastic animals, eg, Obelia.
Ctenophores are biradial symmetrical and diploblastic animals, eg, Ctenoplana.
Sponges are asymetrical or radially symmetrical and diploblastic animals, eg, Sycon.