Johanson, K. A., and R. W. Holzenthal. “The Snail-Case Caddisfly Subgenus Helicopsyche (Feropsyche) in Costa Rica, With the Description of 3 New Species (Trichoptera: Helicopsychidae)”. Zootaxa, vol. 2689, no. 1, Nov. 2010, pp. 37–47, doi:10.11646/zootaxa.2689.1.4.