Taxa included

Ludwig, M. & Alberti, G. (1990). Peculiarities of arachnid midgut glands. Acta Zoologica Fennica 190: 255–259.

Taxon
Prokoenenia wheeleri (Rucker, 1901) (Palpigradi: Prokoeneniidae) 255, figs 4, 7, Prokoenenia wheeleri (Rucker)