Arcuphantes semiorbiculatus, Jin & Ma & Tu, 2018

Jin, Miao, Ma, Shuangchun & Tu, Lihong, 2018, A review of the Arcuphantes species with the genitalia of arcuatulus - type (Araneae, Linyphiidae), Zootaxa 4425 (3), pp. 498-510 : 508-509

Arcuphantes semiorbiculatus new species

Fig. 3G–I

Type material examined. Holotype ♀. USA: California: Soda Creek, west of Nelson Camp , 36°09′N, 118°45′W, 11.vii.1958, W. J. Gertsch & V. Roth leg. (AMNH-158). Paratype . 1 ♀, same data, together with the holotype (AMNH-158).

Etymology. The species name comes from the Latin word ‘semiorbiculatus’, in reference to hemispherical apex of the distal part of the scape.

Diagnosis. The female A. semiorbiculatus n. sp. can be distinguished from A. arcuatulus and A. cruciatus n. sp., by the epigynum triangular in ventral view ( Fig. 3G ) and bulged in lateral view ( Fig. 3H ), the U-shaped scape more expanded than the other two species, and by the distal part of scape having the two lateral lobes fused into a hemisphere shape ( Fig. 3I ). Male unknown.

Description. Female (AMNH-158): Total length 1.59. Carapace 0.76 long, 0.55 wide. Abdomen 0.92 long, 0.63 wide. Leg lengths: I 2.95 (0.82+1.02+0.69+0.42); II 3.01 (0.83+1.03+0.71+0.44); III 2.63 (0.66+0.98+0.61+0.38); IV 3.38 (0.98+1.11+0.85+0.44). Tm I 0.23. Male unknown.

Other somatic and genital characters: see the general description for the Arcuphantes species with arcuatulus - type genitalia.

Distribution. USA (California).

Figures

FIGURE 3. Epigynum. A–C. Arcuphantes arcuatulus, A, ventral; B, lateral; C, dorsal, arrow points to the proximal end of fertilization groove; D–C, A. cruciatus n. sp., D, ventral; E, lateral; F, dorsal; G–I, A. semiorbiculatus n. sp., G, ventral; H, lateral; I, dorsal. [Scale bars, mm]