Arcuphantes cruciatus, 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 : 502-505

Arcuphantes cruciatus new species

Figs 3D–F , 5 , 7C–D

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 . 2 ♀, same data, together with the holotype (AMNH-147, one female without epigynum).

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 ), which is thick and bifid in two other species ( Fig. 7B, F ); the fold at the basal part of the paracymbial middle arm is absent ( Fig. 7D ), but present in the other two species ( Fig. 7B, F ); and by the anterior part of terminal apophysis bulged ( Fig. 7C ), whereas in two other species it is flat ( Fig. 7A, E ). 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 ).

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).

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]

FIGURE 5. Arcuphantes cruciatus n. sp. A–B, male palp, with embolic division removed, A, prolateral; B, retrolateral; C–D, embolic division, arrows point to central serrated area of radix, C, ventral; D, dorsal; E–H, epigynum, with extensible basal part removed, E, ventral, ventral plate artificially broken; F, dorsal; G, caudal; H, inner, shows epigynal grooves. [Scale bars, mm]

FIGURE 7. Male palpal embolic division and paracymbium. A–B, Arcuphantes arcuatulus, C–D, A. cruciatus n. sp., E–F, A. denticulatus n. sp., A, C, E, embolic division, anterior, embolus apex artificially broken in E, arrows point to anterior process of terminal apophysis turning backwards in A and extending forward in E, and bulged anterior part of terminal apophysis in C; B, D, F, paracymbium, arrows in B and F point to basal fold of paracymbial middle arm. [Scale bars, mm]