225. Ixodes spinipalpis Hadwen & Nuttall, 1911

in Nuttall (1911).

Nearctic: 1) Canada, 2) Mexico (north), 3) USA; Neotropical: 1) Mexico (south) (Keirans & Clifford 1978, Durden & Keirans 1996, Guzmán-Cornejo & Robbins 2010, Lindquist et al. 2016, Guglielmone et al. 2021).

Several records of Ixodes spinipalpis have been reported under the name Ixodes neotomae, a species described by Cooley (1944b) but reduced to a synonym of Ixodes spinipalpis by Norris et al. (1997).

Controversy attends the relationship between Ixodes spinipalpis and Ixodes diversifossus . Authors such as Gregson (1956), Keirans & Clifford (1978) and Camicas et al. (1998) treated Ixodes diversifossus described in Neumann (1899) as valid but regarded the redescription of Ixodes diversifossus in Neumann (1911a) as a synonym of Ixodes spinipalpis, although Neumann defined the same species in both cases. Guglielmone et al. (2021) suggested that Ixodes spinipalpis may be a synonym of Ixodes diversifossus .