What type of larva is common to many Molluscs and Annelids, suggesting an evolutionary link between the two phyla?
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Correct answer: Trochophore
The trochophore is a free-swimming, ciliated larval stage bearing a characteristic band of cilia (the prototroch) used for locomotion and feeding. Its occurrence in both Mollusca and Annelida supports the grouping of these phyla within the Lophotrochozoa clade.
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