Pterois range in size from 6.2 to 42.4 cm with typical adults measuring 38 cm and weighing an average of 480 g.They are well known for their ornate beauty, venomous spines and unique tentacles.Juvenile lionfish have a unique tentacle located above their eye sockets that varies in phenotype between species.It is suggested that the evolution of this tentacle serves to continually attract new prey; studies also suggest that it plays a role in sexual selection

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