hirsuta Ingram & Macfie, 1931: 201 (male, female). Type locality: Argentina, Río Negro, PN Nahuel Huapi, Bariloche, 41°08’0.50”S, 71°18'37.00"W. HT M (BMNH). Distr.- Argentina (Neuquén: PN Nahuel Huapi, lago Cántaros, 41°00'23''S, 71°49'18.4''W, 887 m. Río Negro: type locality. Tierra del Fuego: PN Tierra del Fuego, 54º51'23.6''S, 68º35'37.3''W, 31 m). Refs.: Ingram & Macfie, 1931: 201; Cazorla & Spinelli, 2015: 167.
Diagnosis: the only Patagonian species of Stilobezzia (Acanthohelea) that is large (male wing length 2.75–3.03 mm; female wing length 2.38–2.80 mm), with the body completely covered with long, coarse setae and tarsomeres 1–2 of all legs bearing two apical spines. Males sternite 9 with a posteromedian hyaline projection and posterior margin of tergite 9 bilobate. Females scutellum with 10–12 large and 8–10 thinner setae.