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Temporal range: Pliocene
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Arachnida
Order: Schizomida ?
Family: Calcitronidae
Petrunkevitch, 1945 [1]

The family Calcitronidae is an extinct group of arachnids. Its two monotypic genera are only known from Pliocene deposits of calcite in Arizona.[2] 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",[3] and they are not listed in the order in a 2016 catalog of fossil arachnids.[4]


  1. ^ "BioLib - Calcitronidae". BioLib. Retrieved 23 May 2012. 
  2. ^ Rowland, J. Mark (1972). "Revision of the Schizomida (Arachnida)". Journal of the New York Entomological Society. 80 (4): 195–204. JSTOR 25008826. 
  3. ^ 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. 
  4. ^ 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.