Mitochondrial iron transporter that mediates iron uptake. Probably required for heme synthesis of hemoproteins and Fe-S cluster assembly. Expressed in a variety of tissues from embryo to adult. RNAi-mediated knockdown results in smaller, but normally-proportioned animals that are paler and thinner as compared to wild-type, a reduced growth rate, slow movements with a 35% decrease in the number of body bends per 20 seconds, reduced brood size, increased lifespan and inceased sensitivity to the oxidative stress inducer paraquat (PubMed:22253756). RNAi-mediated knockdown results in increased lifespan (PubMed:22253756, PubMed:25769692). Belongs to the mitochondrial carrier (TC 2.A.29) family.