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The scorpion family Pseudochactidae was created in 1988 to contain the remarkable newly-discovered "living fossil" species Pseudochactas ovchinnikovi Gromov, 1998 from central Asia.  Since then, two more species: Troglokhammouanus steineri Lourenço, 2007 from Laos, and Vietbocap canhi Lourenço and Pham 2010 from Viet Nam, both cave dwellers, have been discovered and added to Pseudochactidae, making a total of three known species in this family.  

Although generally considered a basal scorpion lineage, the relation of this family to the rest of the scorpions is still debated; sister relationships to the Chaerilidae and the Buthidae have been suggested (Lourenço and Pham 2010). 


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