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The family was established by Scott (1985) for 2 species from South Africa, Petrothrincus circularis Barnard and P. triangularis (Hagen) (originally described from the case only and included in Molanna); Scott (1993) later described a 3rd South African species, P. demoori and expanded the diagnosis and description of the family. All of the South African species are endemic to the Cape Province. Weaver (1997) recorded the family from Madagascar for the first time and described 3 additional species in a new genus, Gyrocarisa Weaver, to which 2 other species were added later by Malm and Johanson (2005). Recently, Gyrocarisa was synonymized with Petrothrincus by Johanson and Olah (2006), who described 5 additional Malagasy species. As of now, the family contains a single genus, Petrothrincus, containing 14 species from South Africa and Madagascar. From Holzenthal et al. (2007a).


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