Requested reference
Magalhaes, I. L. F., Brescovit, A. D. & Santos, A. J. (2013). The six-eyed sand spiders of the genus Sicarius (Araneae: Haplogynae: Sicariidae) from the Brazilian caatinga. Zootaxa 3599: 101-135. doi:10.11646/zootaxa.3599.2.1 -- Show included taxa