Sexually-produced embryos develop once a year, in early spring. Breeding continues through the early summer. The larvae of M.membrancea are planktonic cyphonautes larvae which feed and grow up to 0.6 mm in height and 0.8 mm across the base. Larvae are triangular in shape and laterally compressed. They are common in coastal plankton from February to November, and are especially abundant between June and August.
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