curvistyla Cazorla & Spinelli, 2007: 182 (male, female). Type locality: Argentina, Chubut, PN Los Alerces, eastern shore lago Futalaufquen, 42°51'59.81"S, 71°36'4.76"W. HT M (MLPA). Distr.- Chile, Argentina (Neuquén: PN Lanin, arroyo Quechu-Quina at lago Lacar, 40° 9'55.64"S, 71°35'4.40"W; PN Lanin, lago Lolog, 40°1'32.63"S, 71°21'17.39"W; PN Nahuel Huapi, isla Victoria, laguna Mercedes, 40º52'43.4''S, 71º34'41''W, 899 m; PN Nahuel Huapi, mallín La Heladera, 41°00'56''S, 71°49'45.4''W, 878 m; PN Nahuel Huapi, Villa Traful, arroyo Blanco, 40º39'3.4''S, 71º24'45.8'', 822 m; PN Nauel Huapi, Villa La Angostura, 40°45'14.51"S, 71°39'4.31"W. Río Negro: PN Nahuel Huapi, Estación Biológica Puerto Blest, 41º01'31.5''S 71º49'21.4''W, 787 m; PN Nahuel Huapi, río Manso superior, 41º14'28.4''S, 71º44'12.6''W, 837 m; lago Gutiérrez, 41°10'49.26''S, 71°23'15.08''W. Chubut: type locality). Refs.: Cazorla & Spinelli, 2007: 182; Cazorla & Spinelli, 2015: 163; Cazorla, 2015: 210.


Diagnosis: The only Patagonian species of Stilobezzia (Acanthohelea) in which males have the gonostylus abruptly curved and the gonocoxite has a conspicuous protuberance on proximal inner margin; females have two large, greatly elongated flask-shaped spermathecae and sternite 8 with a U-shaped posteromedian excavation.

Study of the type material, new specimens of Stilobezzia (Acanthohelea) curvistyla and Stilobezzia (A.) megatheca showed an erroneous association of sexes in both species (Cazorla, 2015)