shannoni (Wirth & Blanton), 1972: 175 (Monohelea; female). Type locality: Argentina, Río Negro, Bariloche, 41°08’0.50”S, 71°18'37.00"W. HT F (USNM). Distr.- Chile, Argentina (Río Negro: lago Escondido, Llao Llao, 41°03'37.99"S, 71°33'57.44"W; 6 km W southern shore lago Mascardi, 41°21'1.70"S, 71°35'58.48"W. Tierra del Fuego: Rt. to Lapataia, 10 km W Ushuahia, peat bog, 54°50'29.95"S, 68°30'58.97"W; 1 km N río Tristén, 54°43'45.07"S 67°56'57.78"W, 170 m; 55 km E Ushuaia, Estancia La Vega, 54°36'36.42"S67°43'29.65"W). Refs.: Spinelli & Grogan, 1999: 709; Ronderos et al., 2017a: 257.
The distribution of A. shannoni is extended to the southernmost region of South America. (Ronderos et al, 2017). This species is known from Nothofagus forests of Río Negro and Tierra del Fuego provinces,
Argentina, and on Wollaston Island, Chile.