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18 mm, making it among the smallest radiodont specimens known, though adults reached a length of 8.3 cm An isolated frontal appendage of a hurdiid from the Ordovician with a length less than half that of the juvenile Lyrarapax is known, but it is not known whether this specimen pertains to an adult. The largest known Cambrian radiodont was Amplectobelua, reaching lengths of up to 90 cm based on an incomplete specimen. Anomalocaris canadensis was also relatively large, estimated up to 34.2 - 37.8 cm long, and

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