Shear, 1975 : « The opilionid family Caddidae in North America, with notes on species from other regions (Opiliones, Palpatores, Caddoidea) » The Journal of Arachnology, vol. 2, no 2, p. 65-88 (texte intégral).
biodiversitylibrary.org
Shultz & Regier, 2009 : « Caddo agilis and C. pepperella (Opiliones, Caddidae) diverged phylogenetically before acquiring their disjunct, sympatric distributions in Japan and North America. » The Journal of Arachnology, vol. 37, no 2, p. 238–240 (texte intégral).
