a. Hydrobiomorpha spinicollis nordica Mouchamps, 1959

Hydrobiomorpha spinicollis ssp. nordica Mouchamps, 1959: 315, figs., 18, 23; Hansen 1999a: 217; Hebauer 2002a: 26; Hansen 2004: 53; Fikáček et al. 2015c: 48; Przewoźny 2022: 19.

Type locality: India, Assam, N. Lakhimpur, «Dejoo» (Mouchamps 1959).

Distribution in India: Assam (Lakhimpur, Nameri National Park, Tezpur), Sikkim, and West Bengal (Darjeeling).

Global distribution: Bhutan, India, and Nepal.