Cave-inhabiting Cheliferidae (Arachnida, Pseudoscorpiones) from Thailand, with description of four new species of Metachelifer Redikorzev

Four new species of the genus Metachelifer Redikorzev, 1938 are described from caves in the provinces of Tak (M.takensis sp. nov. and M.thailandicus sp. nov.), Chiangmai (M.mahnerti sp. nov.), and Nakhon Ratchasima (M.cheni sp. nov.). An identification key is provided to all known world representatives of the genus Metachelifer.