- The larva of particular starfishes as created into the free-swimming stage.
- The larva of particular starfishes as developed in free-swimming phase.
- A generic name directed at the bilateral larval form of some echinoderms, as a starfish, under the effect it was a definite animal: nearly just like Brachiolaria. The word is retained to designate such larvæ or phase of development. See also cut under Asteroidea.