Calcitronidae

Calcitronidae; Temporal range: Pliocene PreꞒ Ꞓ O S D C P T J K Pg N ↓
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]

References

"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. Archived from the original (PDF) on 2016-04-11. 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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[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.

[ReddCoke95-3] Reddell, J.R. & Cokendolpher, J. C. (1995). Catalogue, bibliography, and generic revision of the order Schizomida (Arachnida) (PDF). Speleological Monographs 4. Texas Memorial Museum. Archived from the original (PDF) on 2016-04-11. Retrieved 2016-03-30.

[DunlPennJeke16-4] 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.