In this study new data are presented on the “spadix” subgroup of genus Hadrurus, including the description of a new species, H. anzaborrego, sp. nov., found primarily in the Anza-Borrego Desert State Park (ABDSP) in southern California, USA. This species is distinguished by its internal trichobothrial pattern of the chela and its unique carapace pattern. The status of Hadrurus obscurus Williams, 1970 is discussed and new locality data for this species are provided. A phylogenetic key to the genera, species, and subspecies of subfamily Hadrurinae is provided.
Soleglad, M. E., Fet, V., & Lowe, G. 2011 . Contributions to scorpion systematics. IV. Observations on the Hadrurus “spadix” subgroup with a description of a new species (Scorpiones: Caraboctonidae). Euscorpius, No. 112: 1-36.