Emerasoma curvicerca He, 2020

He, Zhu-Qing, Shen, Chu-Ze & Wu, Xue, 2020, The first phylogenetic study of sword-tail crickets from China inferred from COI, 18 S and 28 S genes, with the establishment of two new genera and description of one new species (Orthoptera: Grylloidea: Trigonidiidae), Zootaxa 4890 (1), pp. 119-128 : 123-125

Emerasoma curvicerca He sp. nov.

Figs. 2–3

Holotype: male, China, Zhejiang, Lin’an , Tianmushan. N 30°18'53", E 119°27'23", Alt. 300 m, 17-viii-2018, coll. He Zhu-Qing. (depository: East China Normal University, China)

Paratype: 1 male & 1 female, same data as holotype ; 2 males, China, Zhejiang, Lin’an , Tianmushan. N 30°18'53", E 119°27'23", Alt. 300 m, 6-ix-2019, coll. He Zhu-Qing ; 1 male, China, Zhejiang, Ningbo , Tiantongshan. N 29°48'30", E 121°47'56", Alt. 350 m, 22-ix-2018, coll. He Zhu-Qing.

Description. Male. Body slender and pubescent ( Fig. 2A , Fig. 3A ). Head wider than anterior margin of pronotum, eyes large, frontal rostrum as wide as 1st antennal joint, vertex very flattened ( Fig. 2C ), 5th joint of maxillary palpi triangular ( Fig. 2E ). Pronotum transverse with posterior margin as wide as head, no obvious lateral carina between disk and lateral lobes, large oval tympanum on inner side of fore tibiae, and a small tympanum on outside ( Fig. 2F ), forewings pubescent and long, exceeding to apex of abdomen, vein parallel without false vein, cross vein existed but not obvious, inner half of dorsal field of left forewing membranaceous, covered by right forewing ( Fig. 2A ), hindwings longer than forewings, hind tibia with three external dorsal spurs and three internal dorsal spurs; apex with six apical spurs with superior apical spur longest in inner side longest, claw with two teeth on each side. Cercus curved inwards, and then outwards ( Fig. 2G , Fig. 3A ). Genitalia: pseudepiphallus with two lateral lobes with left one larger, right lobes sclerotized with sharp apical parts upwards, and left lobe with plier-shape lophus at the posterior apex, pseudepiphallic parameres shorter than sclerotized lophus but expanded, with a tooth at middle on each inner side from dorsal view, ectophallic fold strangle sclerotized, endophallic sclerite as the shape of triangular scale, ramus sclerotized and robust, trapezoid shape ( Fig. 2 I–J).

Female. Similar to male. Cercus not curved ( Fig. 3B ). Ovipositor upward curved, denticulate on the apical valves on both dorsal and ventral margin ( Fig. 2H ).

Coloration. Totally yellow, but green when living. Hindwing brown, but yellow in base half ( Fig. 3 A–B).

Etymology. Species name curvicerca means its curved cercus.

Measurements (in mm).

Male: body length 5.95–6.26, pronotum length 1.18–1.20, hind femur length 3.93–4.24, forewing length 5.16– 5.43, hindwing length 7.74–8.12;

Female: body length 6.19, pronotum length 1.25, hind femur length 3.95, forewing length 5.37, hindwing length 8.85, ovipositor length 2.49.

Distribution. China (Zhejiang), Borneo?

Note. Male genitalia of one specimen from Borneo (identified by Chopard as M. flavescens ) was illustrated in Otte & Alexander 1983, Fig. 157D. However, this specimen has very different genitalia character compared with M. flavescens illustrated by Chopard in 1936, but nearly same to the new species E. curvicerca He sp. nov. Thus, we here consider potential distribution of the new species in Borneo.

Figures

FIGURE 2. Emerasoma curvicerca sp. nov. A. male in dorsal view, B. female in dorsal view, C. male head in dorsal view, D. female head in dorsal view, E. palpus, F. tympana (1. outside, 2. inner side), G. cercus, H. ovipositor, I. male genitalia in dorsal view, J. male genitalia in ventral view.

FIGURE 3. Emerasoma curvicerca sp. n. (A. male, B. female). (photos by He Zhu-Qing)