Mimetus yinae sp. nov.

urn:lsid:zoobank.org:act: 07968710-4B81-4D8C-8DFC-24217A695889

Figs 5–7

Differential diagnosis

The new species resembles M. echinatus Wang, 1990, especially in the cymbial apex of male palp with several macrosetae and distal part of paracymbium with a subtriangular outgrowth (Wang 1990: figs 5A–B, 6C–D; Zeng et al. 2016: figs 1B–C, 2A–B), but can be distinguished from the latter by 1) vexillum of male palp columnar in retrolateral view (Figs 5B, 6D) versus sheet-like in M. echinatus (Zeng et al. 2016: figs 1B–C, 2A–B); 2) the structure of the distal division of bulb different; 3) scape of epigyne bell-shaped in ventral view (Figs 5C, 6F) versus trapezoid in M. echinatus (Zeng et al. 2016: figs 1B–C, 2A–B); 4) length of basal plate about 2.5 times of its width in ventral view (Figs 5C, 6F) versus about 4 times in M. echinatus (Zeng et al. 2016: figs 1B–C, 2A–B).

Etymology

The specific name is patronym in honour of prof. Changming Yin, one of the most famous Chinese arachnologists.

Type material

Holotype CHINA • ♂; Guizhou, Jiangkou County, Dewang Township, Nanmuping Village, Fanjingshan National Nature Reserve, Nanmuping; 27°51′41″ N, 108°36′52″ E; 897 m; 17 Jul. 2015; Cheng Wang, Mingyong Liao, Tian-jun Liu, Gao-tao Liu, Xing Kuang and Peng Luo leg.; GZ-MIM-2015-005.

Paratypes CHINA • 2 ♀♀; same data as for holotype; GZ-MIM-2015-006, GZ-MIM-2015-007 • 1 ♀, Shibing County, Maxi Township, Bajiaoping Village; 27°18′8″ N, 108°5′55″ E; 990 m; 13 Jul. 2017; Xiao-qi Mi, Cheng Wang, Feng-e Li, Gui-jie Tian and Hong Liu leg.; GZ-MIM-2017-001 • 2 ♀♀; Shiqian County, Ganxi Township, Fuyan Village; 27°21′39″ N, 108°1′59″ E; 708.9 m; 16 Jul. 2017; Xiao-qi Mi, Cheng Wang, Feng-e Li, Gui-jie Tian and Hong Liu leg.; GZ-MIM-2017-002, GZ-MIM-2017-003 .

Description

Male (holotype)

MEASUREMENTS. Total length. 4.68.

PROSOMA. 2.37 long, 2.01 wide, pear-shaped, yellow-brown, with a triangular brown patch, two pairs of yellow spots, and three pairs of white patches posteriorly, fovea oval, situated posteriorly (Fig. 6A).

CLYPEUS. 0.25 high.

EYE. Sizes and interdistances:AME 0.21, ALE 0.15, PME 0.13, PLE 0.12, AME–AME 0.05, ALE–AME 0.07, PME–PME 0.11, PME–PLE 0.22. MOA anterior width 1.08, posterior width 1.05, length 0.38.

CHELICERAE (Figs 5E, 6E). red-brown, with 10 promarginal peg setae and 2 retromarginal teeth.

ENDITES. Light yellow, longer than wide.

LABIUM. Light yellow, longer than wide.

STERNUM. Pear-shaped, glabrous, yellow, with few macrosetae on margin.

LEGS. Slim, spiniferous, with brown patches. Length of legs: I 13.19 (3.51, 4.32, 3.76, 1.60), II 9.76 (2.48, 3.42, 2.35, 1.51), III 6.26 (1.97, 1.93, 1.21, 1.15), IV 7.62 (2.50, 2.45, 1.53, 1.14). Leg formula: 1243.

OPISTHOSOMA. 2.47 long, 1.98 wide, oval, with a pair of triangular white patches medially, and covered with brown dots and sparse hairs (Fig. 6A); ventral side with three brown patches, median area grey, glabrous, with white spots on both sides.

PALP (Figs 5 A–B, 6C–D).

CYMBIUM. Slightly domed, with a columnar vexillum, about 4 times longer than wide, and several macrosetae at the apex (Figs 5B, 6D).

PARACYMBIUM. Elongate, strongly sclerotized, slightly curved towards the bulb, with a subtriangular outgrowth distally (Figs 5B, 6D).

SUBTEGULUM. Semicircular; the distal division of bulb rolls up as sulciform to protect embolus (Figs 5 A–B, 6C–D).

EMBOLUS. Slender, and terminal part covered by the distal division of bulb in prolateral view (Figs 5A, 6C).

Female (paratype)

MEASUREMENTS. Total length 5.33.

PROSOMA. 2.72 long, 1.90 wide, yellowish brown, long oval, markings are similar to male (Fig. 6B).

CLYPEUS. 0.21 high.

EYE. Sizes and interdistances: AER 0.20, ALE 0.23, PME 0.13, PLE 0.15, AME–AME 0.04, AME–ALE 0.11, PME–PME 0.10, PME–PLE 0.20. MOA anterior width 1.08, posterior width 1.12, length 0.47.

CHELICERAE. Endites and labium colouration as in male. Chelicerae with 8 promarginal peg setae and 2 retromarginal teeth.

LEG. Patches and spines on legs are similar to those in male. Length of legs: I 12.61 (3.01, 4.35, 3.53, 1.72), II 10.47 (2.87, 3.31, 2.65, 1.64), III 6.48 (2.02, 1.71, 1.43, 1.32), IV 8.01 (2.60, 2.54, 1.75, 1.12).

OPISTHOSOMA. 2.92 long, 2.31 wide, (Fig. 6B). Markings as those in male except for the darker colour; ventral side is similar to male except for three dark patches.

EPIGYNE (Figs 5 C–D, 6F–G). Slightly longer than wide, basal plate big, concave and about 3 times longer than its width (Figs 5C, 6F). Scape bell-shaped, the terminal overlap the posterior margin of basal plate (Figs 5C, 6F). Copulatory openings cambered, posterior-bilaterally (Figs 5C, 6F). Spermathecae oval, touches each other medially (Figs 5D, 6G).

Distribution

China (Guizhou, Fig. 7).