Nymphs have multiple spiny projections across the body, including a pair of spines down the abdomen. As they age, the develop a structure on the thorax that is reminiscent of the adults pronotal shape.

Nymphs of Publilia concava are quite similar in appearance to those of Entylia carinata (the two species are closely related), even having more or less the same color pattern. In general, Entylia nymphs are more spiny than those of Publilia, often with two rows of spines down the abdomen compared to one in Publilia. There often tends to be a bold pair of yellow spines at the base of the thorax in Entylia. Older Entylia instars also show the pronotal shape characteristic of adults.