Macromotettixoides brachycorna, Luo & Zhang & Deng, 2024

Luo, Jieling, Zhang, Rongjiao & Deng, Weian, 2024, First mitogenomic characterization of Macromotettixoides (Orthoptera, Tetrigidae), with the descriptions of two new species, ZooKeys 1195, pp. 95-120 : 95

Macromotettixoides brachycorna sp. nov.

Figs 10 , 11

Material examined.

Holotype: China ♀; Guangxi Province, Hechi, Huanjiang, Yangmei’ao; 25°11'41"N, 108°38'51"E; alt. 1169.13 m; 03.IX.2021; Chaomei Huang leg. Paratypes: China 1♂ 1♀; Guangxi, Hechi, Huanjiang, Yangmei’ao; 25°11'41"N, 108°38'51"E; alt. 1169.13 m; 29.VII.2022; Chaomei Huang and Jieling Luo leg.

Diagnosis.

The new species is similar to Macromotettixoides maoershanensis sp. nov. from which it differs in width of vertex between eyes 1.3 × width of a compound eye (width of vertex between eyes 2.0 × width of a compound eye in M. maoershanensis ); anterior margin of fastigium not surpassing anterior margin of eye (anterior margin of fastigium surpassing anterior margin of eye in M. maoershanensis ); median carina of pronotum slightly elevated and undulated in profile (median carina of pronotum slightly arc-like in profile in M. maoershanensis ); ventral margin of middle femora slightly undulate (ventral margin of middle femora distinctly undulate in M. maoershanensis ). It is also similar to Macromotettixoides tuberculata Mao, Li & Han, 2020 but differs from the latter by width of vertex between eyes 1.3 × width of compound eye (width of vertex between eyes 1.7 × width of compound eye in M. tuberculata ); antennal grooves inserted far below inferior margin of compound eyes (antennal grooves inserted between inferior margin of compound eyes); hind pronotal process narrowly rounded (hind pronotal process broad in M. tuberculata ); lower margin of hind process bend upwards at 1/4 and then tilt straight up, lateral carinae of metazona curved (lower margin of hind process and lateral carinae of metazona slightly straight in M. tuberculata ).

Description.

Female. Body size small. Body length 8 mm, pronotum length 6-7 mm, hind femur length 4 mm.

Head. Head and eyes exserted above pronotal surface (Fig. 10B ). Face and vertex rough, covered with small granules, not fossulae; medial carina erected in anterior half, but absent in posterior half; vertex 1.3 × as wide as a compound eye, not surpassing anterior margin of eyes; anterior margin arc and depressed, curved inward and level with the top of the eyes (Fig. 10C ). In lateral view, frontal ridge and vertex forming a rounded-angle shape; eyes oval and not protruding with vertex; frontal costa rounded between antennal grooves (Fig. 10D ). In frontal view, frontal costa bifurcated above lateral ocelli, the bifurcation of the frontal costa in the middle of the compound eye height; antennae short, filiform, antennal grooves inserted far below inferior margin of compound eyes, 13-segmented, the 7th and 8th segments are the longest, ~ 3-3.5 × longer than its width, antennal grooves 1.5 × as wide as diameter of scapus; lateral ocelli placed at lower one third of inner margin of eyes (Fig. 10E ).

Thorax. The dorsal surface of the pronotum is coarse dorsum with dense granules, anterior margin of pronotum straight; median carina entire and wavy in profile; lateral carinae of prozona slightly parallel; humeral angle obtuse; hind pronotal process narrow and its apex rounded, reaching pregenicular knee (Fig. 10A ); lower margin of hind process bends upwards at 1/4 and then tilt straight up, lateral carinae of metazona curved, width of the area between the two is 0.9 mm (Fig. 10B ). Posterior angles of lateral lobes slightly produced outwards, end of posterior angles truncate, posterior margins of lateral lobes of pronotum only with ventral sinus. Tegmina and hind wings invisible.

Legs. Fore femora and middle femora with slightly undulated ventral margins (Fig. 10F, G ). Hind femora robust and short, 2.3 × as long as wide, with carinated and margins finely serrated (Fig. 11A ); antegenicular denticles and genicular denticles acute; outer side of hind tibia with 5-7 spines, inner side with five or six spines (Fig. 11B ); length of first segment of posterior tarsi slightly longer than third, three pulvilli of first segment of posterior tarsi are increased in turn, three apices acute (Fig. 11C ).

Abdomen. Ovipositor narrow and long (Fig. 11D, E ), length of upper valvulae 3 × its width, upper and lower valvulae with slender saw-like teeth; length of subgenital plate 3.3 × its width, middle of posterior margin of subgenital plate triangular projecting.

Coloration. Body dark brown or brown; antennae tawny; hind femur yellowish brown in the middle and dark brown around the sides; hind tibia yellowish brown, with two light rings in the middle.

Male. Similar to female, but smaller and narrower (Fig. 11F, G ). Body length 6 mm, pronotum length 5 mm, hind femur length 4 mm. Width of vertex between eyes 1.5 × width of compound eye. Subgenital plate short, cone-shaped, apex bifurcated.

Etymology.

The specific epithet is derived from brachycorna, meaning the antennae are shorter and the number of segments is less.

Distribution.

China: Guangxi.

Figures

Figure 10. Macromotettixoides brachycorna sp. nov., holotype female A body, dorsal view B the same, lateral view C head and anterior part of pronotum, dorsal view D head, lateral view E head and anterior part of pronotum, frontal view F left fore femur, lateral view G left mid femur, lateral view.

Figure 11. Macromotettixoides brachycorna sp. nov., holotype female A left hind femur, lateral view B left hind tibia, lateral view C left posterior tarsus, lateral view D subgenital plate of female, lateral view E subgenital plate of female, ventral view. male, paratype F body in dorsal view G body in lateral view.