phyllosoma

from The Century Dictionary.

• noun A spurious genus of crustaceans, based on certain larval forms called by Leach Phyllosoma clavicornis. See glass-crab.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) The larva of the spiny lobsters (Palinurus and allied genera). Its body is remarkably thin, flat, and transparent; the legs are very long. Called also glass-crab, and glass-shrimp.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun zoology The thin, flat, transparent larval stage of certain lobsters.