A series of palinurid phyllosoma larvae obtained from plankton in the western Atlantic is described and illustrated. The phyllosomas differ from those of the common spiny lobster, Panulirus argus, in a number of features. They are characterized in early stages by the short antenna,
and in later stages by the shape and proportions of the cephalic shield and thorax, the retarded development of the endopod of pereiopod 4, and the cheliform ending of pereiopods 1 and 3. On the basis of the known distribution of Palinuridae in the western Atlantic, the larvae are referred
with probability to the spiny lobster Justitia longimana (H. Milne Edwards).
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