The genera Larca and Archeolarca were traditionally included in the Garypidae, but Harvey (1992) transferred them to a separate family, Larcidae.
The Larcidae contains just two genera, Larca and Archeolarca, which are segregated solely on the number of trichobothria on the movable chelal finger. Archeolarca has three or four trichobothria on the movable chelal finger, whilst Larca has just two trichobothria.
Species of Larca occur in Europe and North America, and species of Archeolarca occur in North America.
Judson, M.L.I. and Legg, G. (1996). Discovery of the pseudoscorpion Larca lata (Garypoidea, Larcidae) in Britain. Bulletin of the British Arachnological Society 10: 205-210.
Muchmore, W.B. (1981). Cavernicolous species of Larca, Archeolarca and Pseudogarypus with notes on the genera, (Pseudoscorpionida, Garypidae and Pseudogarypidae). Journal of Arachnology 9: 47-60.