Chaerilus hofereki sp. n. from Vietnam is described and compared with C. cimrmani Kovařík, 2012 from Thailand. C. hofereki sp. n. is characterized mainly by sexual dimorphism. Chela of pedipalp is wide and ampullar, fingers shorter in male than in female. Ratio of chela length to movable finger length 2.2 in males and 1.7–2 in females. Movable finger of pedipalp with 9 or 10 cutting edges. Our study brings the first data on chromosomes of chaerilid scorpions. The karyotype of male paratype of C. hofereki sp. n. consists of high number of chromosomes (2n = 90).

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