Tachycines (Gymnaeta) portae sp. nov.

Figs 8A-C, 15

Specimens examined.

Holotype 1♂, Niujingchongzi Dong Weining County, 2019-VII-17, collected by Xulin Zhou, Lingzhi Ou, Guang Wang, Rongxiang Su Benzhang Shi, Juan Liao and Liangfeng An. paratypes, 4♂, 2♀, same data as holotype.

Diagnosis.

The new species is most closely related to Tachycines (Gymnaeta) buyii sp. nov., but it can be distinguished from the latter by the structure of epiphallus, and hind tarsus keeled ventrally.

Description.

Male. Body rather small for this subgenus. Vertex conical tubercles well developed, bisected from the base; ommateum black and well developed. Legs elongate and slender; fore femur 1.8-1.9 times longer than the pronotum, ventrally unarmed, external genicular lobe with one elongate movable spur, internal knee lobe with a small spine; fore tibiae beneath with two external spurs and one internal spur. Mid femur with an elongate movable spur on both internal and external genicular lobes, ventrally unarmed; mid tibiae beneath with one external spur and one internal spur. Hind femur without spines ventrally; hind tibiae dorsally with 65-81 internal spines and 63-81 external spines, arranged in groups. Supra-internal spur of hind tibiae not exceeding the ventral apex of hind tarsus. Hind tarsus keeled ventrally. Epiphallus of male genitalia nearly door-shaped, lower notch rather deeper than upper notch (Fig. 8A, B).

Female. Appearance is similar to the male. Subgenital plate with three lobes, median lobe large triangular (Fig. 8C); ovipositor is slightly longer than half of the hind femur length, dorsal margin smooth, apical area of ventral margin denticulate.

Coloration.

Body brown, mixed with brown patches; hind femur with brown stripe.

Measurements

(mm). Body ♂6.0-7.0, ♀6.3-7.0; pronotum ♂4.0-4.5, ♀3.8-4.5; fore femur ♂6.8-8.0, ♀6.5-7.5; hind femur ♂10.0-11.5, ♀10.5-11.5; ovipositor 5.5-6.0.

Distribution of light zone.

Light and weak light zone.

Cave adaptation type.

Troglophile.

Etymology.

The specific epithet refers to the shape of epiphallus, the Latin word porta meaning door.