Atmetochilus, Simon, 1887

Kunsete, Chawakorn, Sivayyapram, Varat, Traiyasut, Prapun, Thanoosing, Chawatat, Khamwan, Kitiwat & Warrit, Natapot, 2020, Records and redescription of a mygalomorph spider genus ignored for over 100 years with a new species: the genus Atmetochilus Simon, 1887 (Araneae Nemesiidae) in Thailand, Zootaxa 4819 (3), pp. 521-543 : 538

Key to species of Atmetochilus of the world (modified from Zonstein and Marusik 2016)

1a) (♂ ♀) Medial and posterior sternal sigilla centrally confluent, cuspules on labium absent............................. 2

1b) (♂ ♀) Only posterior sternal sigilla centrally confluent, cuspules on labium present................................. 4

2a) (♀) Scopula absent on metatarsus II, carapace black.................................................. A. atriceps

2b) (♀) Scopula on distal half in metatarsus II.................................................................. 3

3a) (♀) Carapace red; spines present on prolateral of palp, and legs I, II, head of spermathecae spherical............. A. fossor

3b) (♂ ♀) Carapace black; spines absent on prolateral palp, and legs I, II, head of spermathecae dome-shaped or semicircular................................................................................... A. songsangchotei sp. nov.

4a) (♂) Male embolus has shallow tegular ridges....................................................... A. koponeni

4b) (♂) Male embolus with well developed tegular ridges........................................................ 5

5a) (♂) Male embolus with 5 well developed tegular ridges............................................... A. lehtineni

5b) (♂) Male embolus with 2 well developed tegular ridges............................................. A. sumatranus