longisternalis Cazorla & Spinelli, 2012b: 188 (male, female). Type locality: Argentina, Río Negro, PN Nahuel Huapi, arroyo Ñireco, complejo Challhuaco, 41º11'51.9''S, 71º19'40''W, 962 m. HT M (MLPA). Distr.- Argentina (Río Negro: type locality; PN Nahuel Huapi, mallín Los Patos, 41º15'48.6''S, 71º17'50.3''W, 1020 m). Refs.: Cazorla & Spinelli, 2012b: 188; Cazorla & Spinelli, 2015: 169.
Diagnosis: the only Patagonian species of Stilobezzia (Acanthohelea) in which males have the sternite 9 with an elongate, slender posteromedian projection. Females scutum with 14 large and 13 thinner setae and the abdomen brown except the abdominal segment 8 heavily sclerotized.