Arcuphantes denticulatus, 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 : 507

Arcuphantes denticulatus new species

Figs 2F–J , 6 , 7E–F

Type material examined. Holotype ♂. USA, Washington: 4 miles northwest of Monroe, 122°01’W; 47°53’N, 27.viii.1959, W. J. Gertsch & V. Roth leg. (AMNH-146). Paratype . 1♂, same data, together with the holotype .

Etymology. The species name comes from the Latin words ‘denticulatus’, in reference to the fine and close teeth on the central serrated area of the radix.

Diagnosis. The male A. denticulatus n. sp. can be distinguished by the bifid outer paracymbial arm with a sharp inner apophysis ( Figs 6C , 7F ), which is blunt in A. arcuatulus ( Figs 4C , 7B ); the flat terminal apophysis having the anterior projection extending forwards ( Figs. 6D , 7E ), and by the central serrated area with fine and close teeth ( Figs. 2I –J , 6D–E ), while it is uneven in A. arcuatulus and A. cruciatus n. sp. ( Figs 4D–E , 5D–E ). The female unknown.

Description. Male (AMNH-146): Total length 2.29. Carapace 0.90 long, 0.75 wide. Abdomen 1.36 long, 0.75 wide. Leg lengths: I 9.02 (2.52+2.95+2.14+1.41); II 8.02 (2.16+2.51+2.18+1.17), III 5.36 (1.63+1.51+1.43+0.79); IV 7.49 (2.04+2.28+1.96+1.21). Tm I 0.22. Female unknown.

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

Distribution. USA (Washington).

Figures

FIGURE 2. Male palp. A–E. Arcuphantes arcuatulus. A, prolateral; B, ventral; C, retrolateral; D, embolic division, ventral; E, ditto, dorsal; F–J, A. denticulatus n. sp., F, prolateral; G, ventral; H, retrolateral; I, embolic division, ventral; J, ditto, dorsal. Arrows in D, E, I, J refer to serrate area on radix. [Scale bars, mm]

FIGURE 4. Arcuphantes arcuatulus. A–C, male palp, with embolic division removed, A, prolateral; B, ventral; C, retrolateral; D–E. embolic division, arrows point to central serrated area of radix, D, ventral; E, 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 6. Arcuphantes denticulatus n. sp. A–C, male palp, with embolic division removed, A, prolateral; B, ventral; C, retrolateral; D–E, embolic division, arrows point to central serrated area of radix, D, ventral; E, dorsal. [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]