Arcuphantes semiorbiculatus,

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

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Arcuphantes semiorbiculatus

new species

Arcuphantes semiorbiculatus  new species

Fig. 3G –IView FIGURE 3

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). ParatypeGoogleMaps  . 1 ♀, same data, together with the holotype (AMNH-158).GoogleMaps 

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. 3GView FIGURE 3) and bulged in lateral view ( Fig. 3HView FIGURE 3), 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. 3IView FIGURE 3). 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).