Which one is the common ancestral larval form of echinoderms, hemichordates and chordates?

Tornaria

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Bipinnaria

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Dipleurula

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Trochophore

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Solution

The correct option is A Dipleurula
A) Tornaria larva belongs to Hemichordata.
B) Bipinnaria larva belongs to Echinodermata.
C) Dipleurula larva has common traits with echinoderms, hemichordates and chordates and is considered to be the common ancestor.
D) Trochophore larva belongs to Mollusca.
So the correct answer is 'Dipleurula'.

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