Which one of the following is correct with regards to animals with bilateral symmetry, triploblastic body and true body cavity?
Roundworm, earthworm and leech
Earthworm, leech and nereis
Ascaris, round worm and earthworm
Earthworm, sea cucumber and sea urchin
Answer is Right!
Answer is Wrong!
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UPSC Geoscientist – 2020
Animals that are bilaterally symmetrical and triploblastic are typically found from Platyhelminthes onwards. A true coelom (body cavity lined by mesoderm) is present in annelids, molluscs, arthropods, echinoderms (larvae, adults secondarily radial), and chordates. Earthworms, leeches, and nereis are all annelids. Annelids are characterized by bilateral symmetry, a triploblastic body plan, and a true coelom (eucoelomate).