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Phylogenetic tree based on COI sequences of ticks collected from 12 red foxes and a marbled polecat in northwestern China. The evolutionary history was inferred using the maximum likelihood method (bootstrap replicates: 1000) with MEGA 7.0. New sequences obtained in this study are indicated by black triangles. a Ixodes canisuga, b Ixodes kaiseri, c Haemaphysalis erinacei and d Dermacentor marginatus
