A review of the spider genus Atmetochilus of Sumatra, Indonesia, with first analysis of male characters and description of three new species (Araneae, Nemesiidae)

The first Sumatran representatives of Atmetochilus Simon, 1887, the genus formerly known only from two species from Myanmar and one species from India, are currently revealed and reviewed. Three new species (listed below) are described and the current concept of Atmetochilus is redefined following study of the male characters previously almost completely unknown. Most of these characters are studied, illustrated and discussed for the first time. The studied genus is found to be represented in Sumatra by three new species described here: A. koponeni sp. n. (♂ ♀), A. lehtineni sp. n. (♂ ♀) and A. sumatranus sp. n. (♂).