Apparently native to South America (known from Argentina, Brazil, and Uruguay). Recently discovered in North America: California, Maryland, Oklahoma, Tennessee, North Carolina, Louisiana.
Larvae are leafminers in white clover (Trifolium repens).
The only known native Porphyrosela in the US, P. desmodiella, is very similar as an adult. However, it makes underside tentiform mines, not flat upperside mines like those of P. minuta, and Trifolium is not one of its known hosts.
Bentancourt, Carlos M. and Iris B. Scatoni. 2007. Morphology and biology of Porphyrosela minuta
Clarke 1953 (Lepidoptera: Gracillariidae, Lithocolletinae) in Uruguay. Neotropical Entomology 36(4):514-519. (PDF
Eiseman, Charles S., Tracy S. Feldman, Eric F. LoPresti, and Michael W. Palmer. 2017. First North American records of Porphyrosela minuta Clarke (Lepidoptera: Gracillariidae), with notes on its native congener, P. desmodiella (Clemens). Proceedings of the Entomological Society of Washington 119(1):18-23.