A zigzag edge, formed by short, oblique white fascia, separates this stripe from the remaining, mostly dark-grey area.

The mine starts as a narrow, slightly serpentine gallery, increasing in width progressively and becoming a blotch during the last larval instar.

The larva leaves the mine through a slit made in the blotch section.

Pupation takes place in a cocoon, usually made on the adaxial leaf surface of adjacent leaves.

The specific name is derived from the Portuguese Gaúcho, a term commonly used for natives of Rio Grande do Sul, the state in Brazil where the new species was first found.