tridentis Cazorla & Spinelli, 2015: 195 (male, female). Type locality: Chile, cordillaera de las Ríces, 40 km E Curacautín, 1650 m. HT M (MLPA). Distr.- Chile, Argentina (Neuquén: PN Nahuel Huapi, lago Espejo, 40°38'49.3''S, 71°42'12.7''W, 903 m; PN Nahuel Huapi, isla Victoria, laguna Mercedes, 40°52'43.4''S, 71°34'41''W, 899 m. Río Negro: PN Nahuel Huapi, río Manso superior, 41°14'8.1''S, 71°46'58.5''W, 845 m; PN Nahuel Huapi, río Manso medio, La Cantera, 41°21'16''S, 71°42'27.3''W, 764 m). Refs.: Cazorla & Spinelli, 2015: 195.

Diagnosis: the only patagonian species of Stilobezzia (Acanthohelea) which males have the aedeagal sclerites with a short distolateral process and distal portion curved with a basal tooth and tip pointed. Female sternite 8 large and globose, and spermathecae sclerotized with hyaline punctuations.