Blakistonia hortoni is a species of mygalomorph spider in the Idiopidae family. It is endemic to Australia. It was described in 2018 by Australian arachnologists Sophie Harrison, Michael Rix, Mark Harvey and Andrew Austin. The specific epithet hortoni honours Benjamin Horton for his commitment to wildlife education and conservation, and for saving animal lives during the 2015 Sampson Flat bushfires.[1]
The species occurs in south-eastern South Australia. The type locality is Mount Crawford Forest Reserve in the Mount Lofty Ranges.[1]