Sitalcicus gardineri is an allegedly extinct species of harvestmen in the family Podoctidae. The species was endemic to Mahe Island of Seychelles. It has not been found when it was originally described in 1911.
References
Further reading
Hallan, J. (2000-2017). Biology Catalog (2012 version), http://bug.tamu.edu/research/collection/hallan/