Mecistocephalus nagasaunus is a species of centipede in the Mecistocephalidae family. It was described in 1920 by American myriapodologist Ralph Vary Chamberlin.[1]
This species has 49 pairs of legs, can reach about 23 mm in length, and is reddish yellow but more orange near the head, which is dark orange or light chestnut.
The species occurs in Fiji. The type locality is Nagasau.[1]