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The very young, free-swimming larva of the coelenterates. It usually has a flattened oval or oblong form, and is entirely covered with cilia.

The very young, free-swimming larva of the coelenterates. It usually has a flattened oval or oblong form, and is entirely covered with cilia.

The name given by Lankester to the embryo when it consists of the two primary germ layers only, viz., ectoderm and endoderm.

The ovoid young free-swimming larva of Coelenterates.