Temporal range: Pliocene
Petrunkevitch, 1945 
The family Calcitronidae is an extinct group of arachnids. Its two monotypic genera are only known from Pliocene deposits of calcite in Arizona. The family has been placed in the order Schizomida, but a review of the order concluded that "the fossil taxa ... are so poorly known that final placement must await further study and possibly new material", and they are not listed in the order in a 2016 catalog of fossil arachnids.
- "BioLib - Calcitronidae". BioLib. Retrieved 23 May 2012.
- Rowland, J. Mark (1972). "Revision of the Schizomida (Arachnida)". Journal of the New York Entomological Society. 80 (4): 195–204. JSTOR 25008826.
- Reddell, J.R. & Cokendolpher, J. C. (1995). Catalogue, bibliography, and generic revision of the order Schizomida (Arachnida) (PDF). Speleological Monographs 4. Texas Memorial Museum. Retrieved 2016-03-30.
- Dunlop, J.A.; Penney, D. & Jekel, D. (2016). "A summary list of fossil spiders and their relatives, version 16.5" (PDF). World Spider Catalog. Natural History Museum Bern. Retrieved 2016-03-30.
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