Duolandrevus (Eulandrevus) obsidianus He, 2019

Chen, Lin, Shen, Chu-Ze, Tian, Di, Wu, Xue, Li, Kai & He, Zhu-Qing, 2019, A new species of the subgenus Duolandrevus (Eulandrevus) Kirby, 1906 from Guangxi, China (Orthoptera: Gryllidae: Landrevinae), Zootaxa 4701 (6), pp. 553-562 : 557-559

Duolandrevus (Eulandrevus) obsidianus He sp. nov.

( Fig. 2E&F , 4 A–C, 5E)

Holotype: male, CHINA, Guangxi, Baise, Napo , 20-iv-2019, coll. He Zhu-Qing.

Paratypes: 3 males and 2 females, same data as holotype .

Description. Fig. 2E . Head depressed dorsoventrally, slightly transverse, as wide as pronotum, rostrum almost equal to the width of antennal scape, eyes large but not convex, three ocelli nearly in one line with median one smaller, maxillary palps with distal three segments elongated and fifth segment little widened. Pronotum transverse and pubescent, almost 2 times as wide as long, lateral lobes narrow without lateral edge. Forewing short, reaching fifth abdominal tergite, five oblique veins curved with 3 longer ones jointed at base, mirror not well developed with reticulated veins instead, lateral field having 4 parallel longitudinal veins. Tympanum oval, on both inner and outer side of fore tibia with equal size, 5–9 proximal denticles with outer ones more than inner ones on hind tibia, and with 4–5 pairs of articulated spines, hind basitarsus with 5 pairs of dorsal denticles. Abdomen pubescent and cercus long, anal plate with widely rounded. Genitalia: Fig. 4 , it is most similar to that of D. dendrophilus , but epiphallic lateral lobes are bifurcated apically in right angle. Moreover, the top of bifurcated lateral lobes is blunt and straight in the new species, while it is curved and acute in D. dendrophilus .

Female. Similar to male. Forewing short, not as long as pronotum but touch each other in middle. Ovipositor straight ( Fig. 2F ).

Coloration. Totally shinning black, with hind tibia reddish brown.

Etymology. The name obsidianus is used to emphasize its color and texture similar to obsidian.

Measurements (in mm). Male: body length (from head to anus) 21.04–22.09, pronotum length 3.11–3.15, forewing length 7.57–7.88, hind femur length 12.56–12.60; Female: body length 19.40–23.29, pronotum length 3.34–3.39, forewing length 2.49–2.67, hind femur length 13.06, ovipositor length 10.44–11.05.

Distribution. China (Guangxi).

Song. The song is continuous with 7.54± 0.61s cycle with 1.30±0.11 interval repeatedly. It includes 236±18.46 pulse in each chirp with pulse rate as 31.19±0.24 ( Table 3 ., Fig. 5E ).

Figures

FIGURE 2. Duolandrevus (Eulandrevus) spp. from China. A: D. (E.) hainanensis from Ledong, Hainan, B: D. (E.) axinus from Qiongzhong, Hainan, C: D. (E.) dendrophilus from Ningbo, Zhejiang, D: D. (E.) infuscatus from Lin'an, Zhejiang, E: male of D. (E.) obsidianus sp. nov. from Napo, Guangxi, F: female of D. (E.) obsidianus sp. nov. from Napo, Guangxi.

FIGURE 4. Genitalia of D. (E.) obsidianus sp. nov. A: dorsal view, B: ventral view, C: lateral view.

FIGURE 5. Calling songs of Duolandrevus (Eulandrevus) spp. from China. A: D. (E.) dendrophilus, B: D. (E.) hainanensis, C: D. (E.) infuscatus, D: D. (E.) axinus E: D. (E.) obsidianus sp. nov.