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 Author Kunsete, Chawakorn 0000-0002-1594-3736 Author Sivayyapram, Varat 0000-0002-8466-0270 Author Traiyasut, Prapun Author Thanoosing, Chawatat Author Khamwan, Kitiwat Author Warrit, Natapot text Zootaxa 2020 2020-07-24 4819 3 521 543 journal article 8982 10.11646/zootaxa.4819.3.5 15bf44e4-c720-42d7-b1ec-ab13da78e2a7 1175-5326 4397082 AFB116F2-098E-4CE0-B3AB-77932E0B28F4 Damarchus bifidus Gravely, 1935 , comb. nov Damarchus bifidus Gravely, 1935: 70 , fig. 1a. Atmetochilus bifidus : Zonstein & Marusik, 2014: 278 , fig. 25. Diagnosis: Males are similar to those of D. assamensis and D. excavatus in size and male genitalic structure, but differ in the shape of the base of metatarsus I, which is lightly excavate with an extensive area of fine spiniform denticles. The tibial apophysis of D. bifidus differs from those of other species in consisting of three distinct parts, including a basal part which arises minutely from the margin of tibia I, and two distal parts (see Gravely 1935: 70 , fig. 1a). The female is similar to those of D. assamensis and D. excavatus in overall size and shape. Comments. This species was originally placed in Damarchus but it was transferred to Atmetochilus by Zonstein and Marusik (2014) by using male tibial spur character. However, we received a photo of A. bifidus sternum from Mrs Shelley Acharya, the curator at ZSI. We observed that the species has no confluent sternal sigilla ( Fig. 1F ). A discussion with Dr Robert Raven (pers. comm.) resulted in a decision to transfer “ A. bifidus ” back to Damarchus .