A new species of Cybaeus L. Koch, 1868 (Araneae, Cybaeidae) with simple genitalia from central Japan is the sister species of C. melanoparvus Kobayashi, 2006 with elongated genitalia

Cybaeus koikei sp. nov., male holotype (KUZ Z3744: A–C) and female paratype (KUZ Z3743: D, E). A. Cymbium of left palp, dorsal view; B. Bulb of left palp, ventral view; EM, embolus; PCO, proximal arm of conductor; C. Left palp, retrolateral view; RTA, retrolateral tibial apophysis; D. Epigyne, ventral view; PME, posterior margin of epigynal plate; E. Spermathecae, dorsal view; BG, Bennett’s gland; CD, copulatory duct; FD, fertilization duct; PP, primary pore; SB, spermathecal base; SH, spermathecal head; SS, spermathecal stalk. Scale bars: 250 µm (A, B.); 500 µm (C.); 100 µm (D, E.).