In a specimen-based viva, the examiner describes this case: a molluscan embryo passes through a ciliated larval form also seen in annelid life cycles. Choose the concept that fits it best.

Many molluscs and annelids have a trochophore larva, supporting evolutionary links among lophotrochozoan animals. It is a small ciliated larval stage. This MCQ belongs to the Mollusca topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.