Amfractus gen. nov. (ÄdƦø)

Type species: Amfractus dentefaberis sp. nov. (Ḱ‼ÄdƦ)

Etymology. The genus name comes from the Latin adjective “ Amfractus ”, meaning “spiral” and referring to the spiral embolus in male palp. Gender is masculine.

Diagnosis. Based on the spiral embolus (Fig. 6A– C), Amfractus gen. nov. resembles Labullinyphia tersa (Simon, 1894) (Benjamin and Hormiga, 2009, figs 2, 3); Dumoga arboricola Milledge and Russell-Smith, 1992 (figs 71, 73); Plectembolus quadrifactus Milledge and Russell-Smith, 1992 (figs 34, 35, 39, 40), but can be distinguished from any other Erigoninae genera by the long and transparent protegulum; embolic membrane thick, white, spirally coiled along with embolus (Fig. 6A– C). Copulatory ducts long, thick, spirally coiled before joining to the spermathecae, present mesally on the dorsal plate (Fig. 7A–C). Male cephalic lobe with eyes (Figs 8A, B, 9A, B).