Paragavialidium serrimarginis Deng et Zheng

Deng, Weian, Zheng, Zhemin, Wei, Shizhen & Lin, Minping, 2012, A systematic study of the genus Paragavialidium Zheng (Orthoptera: Tetrigoidea: Scelimeninae), Zootaxa 3582, pp. 48-56 : 53-54

Paragavialidium serrimarginis Deng et Zheng , sp. nov.

( Figs. 18 –24)

Description. Female: Body large sized, elongated and slender. Anterior margin of vertex not protruding beyond eyes, median carina inconspicuous, width of vertex 2 times width of an eye (Fig. 19). In profile, vertex before eyes not visible, frontal ridge protruding archly between antennae, width of longitudinal furrow narrower than width of first antennal segment. Antenna filiform, 15-segmented, length of a segment in middle about 7–8 times longer than its width, inserted below lower margins of eyes (Fig. 21). Eyes globose. Lateral ocelli placed on between lower margins of eyes (Fig. 21). Disc of pronotum broad and flat (Fig. 19), with numerous coarse tubercles, midkeel of pronotum with two big tubercle before shoulders, with three or four big tubercle in the middle part of pronotum ( Fig. 18 ). Midkeel of pronotum completed before the middle and not conspicuous behind the middle of pronotum, lateral keels of prozona parallel. Middle of anterior margin of pronotum with a triangular finger-shaped process (Fig. 20), fore edge of the pronotum with two distinct obtuse projecting below eyes, humeral angles of pronotum prominent and acute, lateral margins of pronotum with one or two pair large teeth and serrulate, later with a pair of tubercle (Fig. 19). Caudal end of pronotum narrow, long cone-shaped, surpassing top of hind tibia, apex slightly concave. Posterior angles of lateral lobes of pronotum stickle-like, apice of spine curved forward, posterior margin of lateral lobes of pronotum with two concavities. Tegmina long, ovate, apex sharp rounded. Hind wings developed, slightly not reaching top of pronotal process ( Fig. 18 ). Upper margins of fore femur with three large teeth and lower margins with two large teeth (Fig. 22). Upper and lower margins of middle femora with two large teeth. Hind femur 3 times longer than wide, with 1–2 tubercules on median keel of lower side, midkeel of upper side with 3–4 large teeth, antegenicular and genicular denticles acute, midkeel of lower side with 5–6 teeth and undulated. Outer side of hind tibia with 6–8 spines, inner side with 7–8 spines. Length of first segment of posterior tarsus longer than third, third pulvillus longer than first and second, apices of three pulvilli obtuse. Ovipositor narrow and long, upper and lower valvulae with slender saw-like teeth (Fig. 23). Length of subgenital plate longer than its width, posterior margin of subgenital plate with three teeth.

Body dark brown. Antenna black, between segments of antennae light (Fig. 20). Fore and middle femora and tibia each with two distinct dark transverse spots. Hind femur dark brown. Hind tibia black, with light ring in the base and middle.

Male. Smaller and narrower than female. Width of vertex 1.6 times width of an eye, subgenital plate short, cone-shaped (Fig. 24). Other structures and coloration same as female.

Measurements. Length of body: 311– 11.5mm, Ƥ 14.5–15 mm; length of pronotum: 318– 18.5 mm, Ƥ 19.5–20 mm; length of hind femur:36.5– 7 mm, Ƥ 7.5–8mm.

Type Material. Holotype: female. P.R. CHINA, Guangxi prov., Jinxiu (Dayaohan National Nature Reserve), 24.2N, 110.2E, 1000m alt, 14.VIII.2011, collected by Zhi-Lin CHENG. Paratypes. three male and five female, same data as for holotype. Material is deposited in the Institute of Zoology, Shaanxi Normal University, Xi’an, China.

Remarks. This species can be easily distinguished from other species of the genus by humeral angles of pronotum prominent and acute, lateral margins of pronotum with a or two pair large teeth and serrulate behind humeral angles. Paragavialidium serrimarginis Deng et Zheng , sp. nov. is similar to Paragavialidium hainanensis ( Zheng & Liang) 1985 , but differs in: apex of hind pronotal process concave, wings not reaching top of hind process of pronotum.

Etymology. The new species’ name is derived from the Latin serri and marginis, meaning lateral margins of pronotum serrulate behind humeral angles.

Distribution. China, Guangxi ( Fig. 25 ).

Figures

FIGURE 18. Paragavialidium serrimarginis Deng et Zheng, sp. nov., female, lateral view of body. (scale bar = 1 mm)

FIGURE 25. Geographic distribution of Paragavialidium species.