Metiochodes tianfuensis Ma, Yuan & Gu, 2023

Wang, Rui, Yuan, Wei, Zheng, Yan-Na, Gu, Jun-Jie & Ma, Li-Bin, 2023, Pteronemobius yuani Ma & Wang sp. nov. and Metiochodes tianfuensis Ma, Yuan & Gu sp. nov., new species of Trigonidiidae from China (Orthoptera: Trigonidiidae; Trigonidiinae), Zootaxa 5361 (4), pp. 573-578 : 576-577

Metiochodes tianfuensis Ma, Yuan & Gu sp. nov.

Figs. 3 , 4 , 5

Type material. Holotype. China: ♁, Jinfengshan Park, Ya’an , Sichuan, 16-viii-2022, Yuan, Wei coll. ( SNNU) . Paratype. 1♁ 1♀. China: Dujiangyan , Sichuan, 15-ix-2021, Yuan, Wei coll. ( SICAU) .

Chinese name: *ṀṞḌDz

Measurements (mm). Male (n=1): BL 4.00, HL 0.56, HW 1.11, PL 1.25, PW 1.15, FWL 6.02; Female (n=1): BL 4.78, HL 0.55, HW 1.05, PL 1.21, PW 1.07, FWL 5.86, OL 3.08.

Etymology. The specific epithet “ tianfu- ” refers to the alternative name of the locality where the specimens were collected.

Description male. Body-sized small. Head pilose, significantly wider than pronotum. Ocelli well-developed and protruding.Vertex wide and flat, with a noticeable tilt. The center of the occiput protruding with four indentations around it. The antennal scape round shield-shaped, slightly wider than the frontal rostrum. The segment of maxillary palpus flat and triangular. Cheek shiny and plump. Pronotum trapezoidal, posterior margin slightly wider than the anterior, anterior margin straight, posterior margin slightly convex. Both sides of the central sulcus with scratches.

Tegmina reaching the end of the abdomen. Four main veins parallel, and few transverse veins. The base of the Sc vein bifurcates into ScA and ScP, and ScP has four branches. R (orange color line) and M (yellow color line) veins fused at the base, ends of M vein bifurcating into MA and MP (green color line). Three AA veins. The Cu vein furcating many times: Cu vein basaly bifurcating into CuA (red color line) and CuP, the CuP basaly then bifurcating into CuPa (blue color line) and CuPb (purple color line), and the end of CuPa bifurcating into CuPaα and CuPaβ, next CuPaα divided into two branches, CuPaα1 and CuPaα2. In addition, the h vein connecting the veins of CuPaβ and CuPaα2, and the c vein connecting the corners formed by CuPaβ and CuPb.

The exposed part of the wing accounts for about 60% of tegmen. The anterior tibia only bearing an outer tympanum.

Genitalia. Genitalia membranous, epiphallus with symmetrical spiny. In the ventral view, the epiphallic lateral lobe parallelogram-shaped. The ectoparamere well-developed, with ossified and conical ends that bend towards the ventral.

Female. Similar to males, tegmina only with longitudinal veins. Ovipositor sword-shaped.

Coloration. Body bright green when alive. Tegmina yellow green; wings light brown. Eyes green, with dark brown patterns.

Remarks. M. tianfuensis is similar to Emerasoma curvicerca (He, et al., 2020) in appearance, but the epiphallic M. tianfuensis is symmetrical. Secondly, M. tianfuensis is similar to Metiochodes truncatus (Li, et al., 2010) in male genitalia, but differ in the body color bright green and the genitalia of M. tianfuensis are generally thicker, epiphallic lateral lobe has spines.

Figures

FIGURE 3. Body of M. tianfuensis sp. n. A. male; B. female; Scale bar: 2 mm.

FIGURE 4. Head of male for M. tianfuensis sp. n. A. front view of head; B. lateral view of head. Scale bar: 0.2 mm.

FIGURE 5. Tegmina of male for M. tianfuensis sp. n. Color coding for veins modified from Desutter-Grandcolas, et al. (2005) (green=R; yellow=M, MA; brown=MP; red=CuA; blue=CuPa; purple=CuPb).