Shaanxinus magniclypeus Lin, 2019

Lin, Shou-Wang, Lopardo, Lara, Haase, Martin & Uhl, Gabriele, 2019, Taxonomic revision of the dwarf spider genus Shaanxinus Tanasevitch, 2006 (Araneae, Linyphiidae, Erigoninae), with new species from Taiwan and Vietnam, Organisms Diversity & Evolution (New York, N. Y.) 19 (2), pp. 211-276 : 225-226

Shaanxinus magniclypeus Lin sp. n., Eastern population Figs. 2a , 8 , 9 and 12

Type material. Holotype: ♂, Taitung County, Shimianshan , 396 m (22° 55′ 53′′ N; 121° 10′ 41 E ′′), 19.VI.2014, tree branch beating, in subtropical broad-leaved forest, leg. S.-W. Lin (ZIMG-II-28404) . Paratypes: 4♂ 6♀, same locality and date as holotype, tree branch beating, leg. S.-W. Lin (ZIMG-II-28405~28,414) ; 1♂, Pingtung County, Shizi Township, close to Shouka Cyclist Rest House , 458 m (22° 14′ 34′′ N; 120° 50′ 42′′ E), 20.VI.2014, tree branch beating, in subtropical secondary broad-leaved forest, leg. S.-W. Lin (ZIMGI-II-28415) . 4♂ 5♀, Hualien County, Yuli Township, close to Chikeshan , 750 m (23° 23′ 13′′ N; 121° 22′ 53′′ E), 19.VI.2014, tree branch beating, in subtropical secondary broad-leaved forest, leg. S.- W. Lin (2♂ 3♀ NMNS-7927-001 ~005; 2♂ 2♀ SMF) .

Other material. Same locality and date as holotype, tree branch beating, leg. S.-W. Lin 4♂ 6♀ ( ZIMG- II-28416, 28418, 28419, 28421, 28423); Hualien County, Yuli Township, close to Chikeshan , 750 m (23° 23′ 13′′ N; 121° 22′ 53′′ E), 19.VI.2014, tree branch beating, in subtropical secondary broad-leaved forest, leg. S.-W. Lin 2♂ 5♀ (ZIMG-II-28417, 28420, 28422, 28424) .

Diagnosis. Males: distance between clypeal groove upper and lower margins large, also significantly larger than Northern population (t test, n 1 = 10, n 2 = 10, t = 4.4074, p <0.001). PC gradually decreases in width from middle part toward tip.

Females: Posterior margin of dorsal plate slightly sclerotized ( Fig. 8f ).

Description. Male (Holotype, ZIMG): total length: 2.47. Carapace 1.15 long, 0.87 wide. Opisthosoma 1.34 long, 0.81 wide. ALE-ALE: 0.141. Clypeal groove height: 0.031; groove-clypeal margin: 0.46; AME-groove: 0.077. Leg formula 2> 4> 1> 3; leg measurements see Appendix Table 10; Tm I: 0.86. Pedipalp: patella length/height = 1.39; femur/patella = 3.89. Palpal features and prosomal modifications as in diagnosis and generic description.

Female (Paratype, ZIMG): total length: 2.77. Carapace 1.08 long, 0.85 wide. Leg formula 2 = 1> 4> 3; leg measurements see Appendix Table 10; Tm I: 0.83. Opisthosoma 1.68 long, 1.13 wide. Spermathecae width: 0.3. See diagnosis and generic description for somatic features and epigyne morphology.

Variation. Measurements based on type material (10♂, 10♀).

Males (n = 10): total length: 0.2–0.25 (2.38). Carapace 0.97–1.21 (1.13) long, 0.74–0.93 (0.85) wide. ALE-ALE: 0.114 –0.159 (0.14). Groove height: 0.013 –0.054 (0.03). Groove-clypeal margin: 0.37–0.49 (0.45). AME-groove: 0.068–0.09 (0.078). Tm I: 0.81–0.88 (0.83).

Females (n = 10): total length: 2.6–3.05 (2.8). Carapace 1.08 – 1.33 (1.15) long, 0.82 – 0.97 (0.87) wide. Spermathecae width: 0.27–0.3 (0.28); distance between two copulatory openings: 0.13–0.154 (0.143). Tm I: 0.81– 0.9 (0.86).

Distribution. Taiwan, Hualien County, Pingtung County.

Figures

Fig. 2 Palpal tibia of a Shaanxinus magniclypeus sp. n. and b S.hehuanensis sp. n., dorsal view

Fig. 8 Shaanxinus magniclypeus sp. n., Eastern population, a–e Male left palp, drawings and photos. a, d Retrolateral view. b Prolateral view. c Ventral view. e Apical view. f–h Epigyne, photo and drawings. f, h Ventral view, Bd^ dorsal plate, Bv^: ventral plate. g Dorsal view. Scale bars 0.10 mm

Fig. 9 Shaanxinus magniclypeus sp. n., Eastern population, photos. a–d Male habitus. e–h Female habitus. a, e Dorsal view. b, f Lateral view. c, g Ventral view. d, h Frontal view. Scale bars 1 mm

Fig. 12 Collecting sites of Shaanxinus in Taiwan. Two or more symbols next to each other represent sites where multiple species were collected; the location is at the center between symbols