() sp. nov. (Acari, argasidae), a new tick species from the Mongolian marmot (), Gansu province in China.

A new argasid species, belonging to the subgenus , namely, () was described for the first time based on the females, males and nymphs. The morphological features of each stage in the life cycle are unique, making identification easy, but are similar to other species of the subgenus . The new species was diagnosed by the broad rectangular tongue and triangular tongue-shaped posterior lip in the male genital apron, a shallow camerostome with definite folds and smaller mammillae with single seta mixed with larger ones in nymph and adults. The new species had been collected from the Mongolian marmots in Huajian village, Gulang county, Gansu province, China. Data on the phylogenic position, hosts and geographic distribution are also provided.