Yamaneta kehen (Miller, Griswold & Yin, 2009) Miller, Griswold & Yin, 2009

Feng, Chengcheng, Miller, Jeremy A., Lin, Yucheng & Shu, Yunfei, 2019, Further study of two Chinese cave spiders (Araneae, Mysmenidae), with description of a new genus, ZooKeys 870, pp. 77-100 : 86

publication ID	https://dx.doi.org/10.3897/zookeys.870.35971
publication LSID	lsid:zoobank.org:pub:4167F0DE-2097-4F3D-A608-3C8365754F99
persistent identifier	https://treatment.plazi.org/id/E8616152-783D-5FAB-957D-12C72B43096A
treatment provided by	ZooKeys by Pensoft
scientific name	Yamaneta kehen (Miller, Griswold & Yin, 2009)
status	comb. nov.

Treatment

Yamaneta kehen (Miller, Griswold & Yin, 2009) View in CoL comb. nov. Figs 4 View Figure 4 , 5 View Figure 5 , 6 View Figure 6 , 10A View Figure 10

Material examined.

CHINA • 2♂♂, 25♀♀ multiple juveniles; Yunnan Province, Nujiang Lisu Autonomous Prefecture, Fugong County, Shiyueliang Town, Lishadi Village, 3.9 km E of Yamu River Fork, "a nameless cave"; 27.12818N, 98.86014E; 1500 m a.s.l.; 18 Aug. 2018; Y.C. Li, Y. Li, Y.F. Shu & Y.C. Lin leg.; NHMSU • GoogleMaps 1♂; same data as for preceding; GenBank: MK908789, MK908805, MK908797, MK895530, MK895538; GlgMY14 male • GoogleMaps 1♀; same data as for preceding; GenBank: MK908790, MK908806, MK908798, MK895531, MK895539; GlgMY14 female • GoogleMaps 1 juvenile; same data as for preceding; GenBank: MK908791, MK908807, MK908799, MK895532, MK895540; GlgMY 14 juv. • GoogleMaps 1♂; same data as for preceding; GenBank: MK908792, MK908808, MK908800, MK895533, MK895541; GlgMY15 male • GoogleMaps 1♀; same data as for preceding; GenBank: MK908793, MK908809, MK908801, MK895534, MK895542; GlgMY15 female. GoogleMaps

Diagnosis.

Yamaneta kehen can be distinguished from its congener Y. paquini by having only a single proximal-dorsal trichobothrium (TTr) and a single long distal-ventral setae (TiS) on the male palpal tibia, but 2 of each in Y. paquini ( Fig. 5 A, B View Figure 5 vs. Fig. 8 A, B View Figure 8 ); and by the form of the epigyne in the female, which features a basally wider and shorter scape ( Fig. 6 C View Figure 6 vs. Fig. 9 C View Figure 9 ), a distinctly notched lateral margin of the scape ( Fig. 6 D View Figure 6 vs. Fig. 9 D View Figure 9 ), and a more strongly curved profile of the dorsal surface of the scape ( Fig. 6 B View Figure 6 vs. Fig. 9 B View Figure 9 ). Lateral margins of scape proximal to notches are nearly parallel in Y. paquini ( Fig. 9 C, D View Figure 9 ), converging in Y. kehen ( Fig. 6 C, D View Figure 6 ).

Description.

Male. Somatic coloration and characters see Fig. 4 A–C View Figure 4 .

Measurements: Total length 2.19. Carapace 1.13 long, 1.12 wide. Clypeus 0.26 high. Sternum 0.57 long, 0.58 wide. Abdomen 1.09 long, 1.10 wide. Length of legs: I 6.98 (2.13, 0.66, 1.77, 1.27, 1.15); II 5.92 (1.83, 0.57, 1.46, 1.12, 0.94); III 3.93 (1.28, 0.39, 0.86, 0.74, 0.66); IV 4.25 (1.42, 0.40, 0.97, 0.83, 0.63).

Male palp ( Fig. 5 A–F View Figure 5 ): Femur long, curved mesially ( Fig. 5 E, F View Figure 5 ); patella elongate, with a distal-dorsal spine ( Fig. 5 E, F View Figure 5 ); tibia swollen, longer than patella, bears cluster of stiff dorsal setae and a dorsal trichobothrium proximally, with a long ventral setae distally ( Fig. 5 B View Figure 5 : TiS). Cymbium broad, covers ventral part of bulb, dorsal part exposed ( Fig. 5 A–C View Figure 5 ). Paracymbium with long thick setae ( Fig. 5 C View Figure 5 ). Cymbial apophysis small hooked, sclerotized, on prolateral surface of cymbium ( Fig. 5 A–C View Figure 5 ). Cymbial conductor translucent, falcate, bearing dense cluster of long setae on prolateral face ( Fig. 5 C View Figure 5 ). Tegulum smooth, without process; spermatic duct long, twisted on base of embolus ( Fig. 5 D View Figure 5 ). Embolus long, wire-like, with proximal origin ( Fig. 5 B, D View Figure 5 ).

Female.

See Fig. 4 D–F View Figure 4 . Somatic characters as in male, but larger in size.

Measurements: Total length 2.48. Carapace 1.12 long, 1.10 wide. Clypeus 0.25 high. Sternum 0.64 long, 0.63 wide. Abdomen 1.43 long, 1.30 wide. Length of legs: I 6.46 (1.95, 0.63, 1.65, 1.21, 1.02); II 5.55 (1.66, 0.61, 1.38, 1.05, 0.85); III 3.82 (1.22, 0.42, 0.84, 0.73, 0.61); IV 4.09 (1.44, 0.40, 0.93, 0.75, 0.57).

Vulva ( Fig. 6 A–D View Figure 6 ): Scape relatively wide basally ( Fig. 6 A, C View Figure 6 ), with distinctly notched lateral margins ( Fig. 6 D View Figure 6 ) and strongly curved dorsal profile ( Fig. 6 B View Figure 6 ). Lateral margins of scape proximal to notches are converging ( Fig. 6 C, D View Figure 6 ).

Distribution.

Known from a single cave in Yunnan, China.

Natural history and web architecture.

This species lives in the dark zone of the cave. They build a web typical of Maymena (e.g., Eberhard 1986, Lopardo and Hormiga 2015: fig. 147 D, E). Aerial lines extend upwards from web radii and hub and are attached to frame lines or the substrate above. The web is under tension and the hub is lifted. The catching spiral is dense and nearly horizontal. Above the catching spiral is an irregular network of horizontal and angled lines under tension ( Fig. 10 A View Figure 10 ). The spider usually hangs in the irregular area above the catching spiral.