All having characteristic of Dermacentor marginatus e.g., palp articles 2 posterior spur length is short on the dorsal surface.
What do you mean by "related"? They do all appear to be Dermacentor therefore they are related, are you referring to their location on a specific key?
Since D. marginatus reported as a polymorphic tick species (Estrada-Peña A, Estrada-Peña R. 1991. Notes on Dermacentor ticks: redescription of D. marginatus with the synonymies of D. niveus and D. daghestanicus (Acari: Ixodidae). Journal of Medical Entomology 28:1-15.)
The traditional keys are impractical for this species.
I think they are all belonging to Dermacentor spp. but barely differentiated at the species level if they have..
it is better to keep them as Dermacentor spp because they exhibit a big variation of ornates and colors however you can look for D. variabilis nymph or D. andersoni and D. occidentalis adults which are lighter usually (these latter are not common to Asia!)
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