Arcuphantes cruciatus, Jin & Ma & Tu, 2018

Arcuphantes cruciatus View in CoL new species

Figs 3D–F View FIGURE 3 , 5 View FIGURE 5 , 7C–D View FIGURE 7

Type material examined. Holotype ♂. USA: Oregon: Sixes ( 1 mile north), 124°30′W; 42°51′N, 30.ix.1959, Vincent Roth leg. (AMNH-147). Paratypes GoogleMaps . 2 ♀, same data, together with the holotype (AMNH-147, one female without epigynum). GoogleMaps

Etymology. The species name comes from the Latin word ‘cruciatus’, in reference to the cross-shaped paracymbium.

Diagnosis. The male A. cruciatus n. sp. can be distinguished from A. arcuatulus and A. denticulatus n. sp. by the thin sclerite-like paracymbial outer arm ( Fig. 7D View FIGURE 7 ), which is thick and bifid in two other species ( Fig. 7B, F View FIGURE 7 ); the fold at the basal part of the paracymbial middle arm is absent ( Fig. 7D View FIGURE 7 ), but present in the other two species ( Fig. 7B, F View FIGURE 7 ); and by the anterior part of terminal apophysis bulged ( Fig. 7C View FIGURE 7 ), whereas in two other species it is flat ( Fig. 7A, E View FIGURE 7 ). The epigynum of A. cruciatus n. sp. is similar to that of A. arcuatulus , but the appearance of epigynum is more stout than in the latter species; the prolonged basal part under the extensible base is wider than long, with parallel lateral margins ( Fig. 3D View FIGURE 3 ).

Description. Male (AMNH-147): Total length 2.21. Carapace 1.05 long, 0.87 wide. Abdomen 1.24 long, 0.60 wide.

Female (AMNH-147): Total length 1.63. Carapace 0.63 long, 0.59 wide. Abdomen 0.98 long, 0.70 wide. Leg lengths: I 6.53 (1.73+2.10+1.64+1.06); II 5.84 (1.64+1.83+1.46+0.91); III 5.00 (1.35+1.49+1.29+0.87); IV 5.33 (1.69+1.72+1.27+0.65). Tm I 0.19.

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

Distribution. USA ( Oregon).