Larnaca (Larnaca) lincangensis (Yang, Jing & Bian, 2020) Yin & Shen, 2023

Yin, Zi-Xu & Shen, Si-Zhong, 2023, Notes on the taxonomy revision of poorly known of tribe Eremini Cadena-Castañeda, 2019 from China (Orthoptera: Gryllacrididae: Gryllacridinae), Zootaxa 5271 (1), pp. 140-154 : 149-150

Larnaca (Larnaca) lincangensis (Yang, Jing & Bian, 2020) comb. nov. (ÑffldzDzȃ)

Figures.8–10

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName: 496382

Eremus lincangensis: Yang, Jing & Bian, 2020 . Zootaxa, 4895(1): 149.

Type specimen: male; holotype; Type locality: Nangunhe National Nature Reserve , Wengding Village , Mengjiao Town , Cangyuan Country, Lincang Prefecture, Yunnan Province, China ; Location of type specimen: Institute of Entomoceutics Research , Dali University, China .

Material examined. 1♁ 1♀, China, Yunnan Province, Xishuangbanna Dai Autonomous Prefecture, Jinghong County, Jinuo Mountain , VIII-2022, coll. Haocheng Dong & Le Liang ; ♁, China, Yunnan Province, Xishuangbanna Dai Autonomous Prefecture, Menghai County, Bulang Mountain , VIII-2021, coll. Haoran Gao.

Description. Small species. Head as wide as pronotum ( Fig. 8D ; Fig. 9B ). Fastigium verticis about 1.6 times as wide as scape; scape as long as eye; ocelli indistinct ( Fig. 8A ; Fig. 9A ). Anterior margin of pronotum slightly convex in the middle, posterior margin slightly concaves in the middle ( Fig. 8D ; Fig. 9B ); lateral lobes longer than deep ( Fig. 8B ; Fig. 9D ). Second and third abdominal tergites each with two rows of stridulatory pegs (3–4,9–12,4– 6,11–13) ( Fig. 8C ; Fig. 9C ). Tegmen reduced to minute pads not reaching hind margin of corresponding notum; hind wing with only traces of wing rudiments on pterothoracic tergites.

Fore coxa with a spine at fore margin ( Fig. 8B ; Fig. 9D ). Fore and mid femora unarmed. Fore tibiae ventrally with 4 pairs of internal spines and one pair of smaller spurs; mid tibiae with 4 pairs of internal spines and one pair of smaller spurs, dorsally with an internal apical spur. Hind femora ventrally with 6–11 external and 6–12 internal spinules; hind tibiae dorsally with 6–7 external and 7 internal spines, ventrally with a preapical spine and 2 apical spurs on both sides. External margins of hind femora with a long furrow ( Fig. 8E ; Fig. 9E ); stridulatory denticles on the inner side of hind femora indistinct.

Male. Eighth abdominal tergite prolonged ( Fig. 8G ). Ninth abdominal tergite curved downwards, furrowed along midline into 2 lobes; apical area prolonged into a spiniform process which greatly crossed at midline and pointing inside; apices granular and truncated ( Fig. 8F ). Cerci slender and incurved ( Fig. 8F ). Subgenital plate broader than long; anterior margin straight; one-third of apical section gradually narrowing; posterior margin with an obviously V-shaped median incision; styli straight, inserted in posterior area of lateral margins of subgenital plate ( Fig. 8H ).

Female. Seventh abdominal sternite forming a pair of semi-circular lobes pointing towards the midline; between them with a wide U-shaped groove in the middle. Subgenital plate transverse, very short especially in the middle, pressed against seventh sternite with basal margin concave, giving room for the extension of seventh sternite ( Fig. 9F ). Ovipositor falcate, curved upward strongly; dorsal margin and ventral margin smooth, gradually approaching towards apex ( Fig. 9G ).

Measurements (mm). Body (from head to tip of abdomen): 16.8–21.8; pronotum: 4.0–4.9; tegmen: 0.8–1.1; fore femur: 5.6–7.2; median femur: 5.5–6.8; hind femur: 9.8–12.5; fore tibia: 6.3–7.6; median tibia: 5.9–7.8; hind tibia: 9.3–12.5; ovipositor: 8.5.

Coloration. General color yellowish brown, forehead part above the lower edge of antennal scrobus concolor with the rest body while the lower part black, clypeus white, lower part of labrum brown, mandibles black; dorsal spines on hind tibia black with black basal area, genicular area of hind tibia and femora black, the basal area of hind tarsus also black.

Notes. Ingrisch (2018) reviewed the species of Eremus . He suggested that Eremus decolyi Bolívar, 1900 should be placed to another genus like Capnogryllacris , based on the pair of oval swellings on the male ninth abdominal tergite which extended medio-apically into long stout spines crossing each other. L. (L.) lincangensis had similar characteristics with E. decolyi . Male’s ninth abdominal tergite of the specimen globular with medial furrow, before posterior-ventral margin swollen on both sides of midline. In addition, ovipositor falcate, most strongly upcurved in subbasal area, margins gradually approaching towards apex. These characteristics are more consistent with the genus Larnaca Walker, 1869 than Eremus .

L. lincangensis is similar to L. infolda : some specimens have similar pronotum pattern, ninth abdominal tergite with no globular lobes, and wings are much smaller than other species. But they can still easily be distinguished by: L. lincangensis has much smaller elytra than L. infolda ; the terminal lobes of subgenital plate of L. lincangensis are much sharper than L. infolda .

Distribution. China (Yunnan).

Figures

FIGURE 8. Morphological structures of male Larnaca (Larnaca) lincangensis (Yang, Jing & Bian, 2020). A. face; B. lateral view of head and pronotum; C. stridulatory pegs on the second and third abdominal tergites, left lateral view; D. dorsal view of head and pronotum; E. external side of left hind femur; F. rear view of abdominal apex; G. lateral view of abdominal apex; H. ventral view of abdominal apex.

FIGURE 9. Morphological structures of female Larnaca (Larnaca) lincangensis (Yang, Jing & Bian, 2020). A. face; B. dorsal view of head and pronotum; C. stridulatory pegs on the second and third abdominal tergites, left lateral view; D. lateral view of head and pronotum; E. external side of left hind femur; F. ventral view of abdominal apex; G. ovipositor.

FIGURE 10. Larnaca (Larnaca) lincangensis (Yang, Jing & Bian, 2020). A, C–E. male; B. female. Scale: 1 cm. © C–E by Fan Gao; published with permission (https://www.inaturalist.org/observations/139507622).