25. Dermacentor nuttalli Olenev, 1929c .

Palearctic: 1) China (north), 2) Mongolia, 3) Russia (Filippova 1997, Chen et al. 2010, Kiefer et al. 2010, Kulakova et al. 2014, Černý, J. et al. 2019, Tsapko 2020, Zhao et al. 2021).

Dermacentor nuttalli is a member of the Dermacentor marginatus species complex and very close to another member of the complex, Dermacentor silvarum, with the result that morphological differentiation of these species is difficult. Authors such as Khasnatinov et al. (2016) and Bolotova et al. (2017) have referred to this tick as Dermacentor silvarum / Dermacentor nuttalli .

Kolonin (2009), Burridge (2011) and Guglielmone & Robbins (2018) included Kazakhstan within the geographic distribution of Dermacentor nuttalli, but this was not recognized by Kulakova et al. (2014). Additionally, Abdiyeva et al. (2020) and Perfilyeva et al. (2020) did not list Dermacentor nuttalli as present in Kazakhstan, and we have therefore provisionally excluded that country here.