Amfractus, Irfan & Zhang & Peng, 2022

Irfan, Muhammad, Zhang, Zhi-Sheng & Peng, Xian-Jin, 2022, Survey of Linyphiidae (Arachnida: Araneae) spiders from Yunnan, China, Megataxa 8 (1), pp. 1-292 : 11

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 ).

Figures

FIGURE 6. Amfractus dentefaberis sp. nov., male palp of holotype. A prolateral view B retrolateral view C ventral view D dorsal view.

FIGURE 7. Amfractus dentefaberis sp. nov., female (one of paratypes). A, B Epigyne, ventral view C Vulva, dorsal view.

FIGURE 8. Amfractus dentefaberis sp. nov., male holotype. A Habitus, frontal view B Habitus, cephalothorax lateral view.

FIGURE 9. Amfractus dentefaberis sp. nov., male holotype (A–C) and female (one of paratypes, D, E). A, D Habitus, dorsal view B Habitus, lateral view C, E Habitus, ventral view.