Systolederus aspinus Deng, 2019

Deng, Wei-An, Lu, Xiang-Yi, Zhao, Cong-Lin & Wu, Fei-Peng, 2019, A review of the genus Systolederus Bolivar (Orthoptera: Metrodorinae) from China, Zootaxa 4585 (3), pp. 489-500 : 491-495

1. Systolederus aspinus Deng , sp. nov.

( Figs. 1–3 )

Description. Female (holotype). Body small-sized, slender. Head distinctly exerted above upper level of pronotum; in dorsal view, vertex strongly contracted forward drawing the eyes very near together, not exserted before eyes, median carina distinct, extended to occiput; lateral margins turned backward and just above upper level of the eyes; width of vertex 0.2 times width of an eye. Frontal ridge being lamellate, it forming an obtuse round shape between vertex and median ocellus in profile. In frontal view, longitudinal furrow of frontal ridge being narrow-slitted, its width distinctly narrower than width of first antennal segment. Antenna filiform, 16- segmented; length of a segment in middle approximately 7–8 times longer than its width, inserted between lower margins of eyes. Eyes distinctly exerted, globular in shape, middle of eye is level with upper margin of pronotum; lateral ocelli placed on middle of or slightly below the middle of anterior margins of eyes.

Disc of pronotum smooth, with numerous small shining granules; in dorsal view, anterior margin of pronotum truncate and middle slightly concave, median carina of pronotum entire (but median carina of prozona unconspicuous); upper margin of pronotum slightly undulating before shoulders and straight behind shoulders in profile; lateral carinae of prozona short and parallel, humeral angle obtuse, without abbreviated carinae between shoulders. Posterior process of pronotum narrow, long cone-shaped, apex slightly surpassing apex of hind tibia. Lateral lobes of pronotum produced outwards and little turned downwards, posterior angles obliquely truncate behind; posterior margin of each lateral lobe of pronotum with two concavities. Visible part of tegmina ovate, apex narrowly rounded, its width distinctly wider than width of middle femora. Hind wings developed, reaching apex of posterior process of pronotum. Fore femur and mid femur long and thin, lower margins of fore femora straightly or slightly undulated, midfemora almost straight. Hind femur 3.4 times as long as wide, anterior half of upper margin smooth and posterior half finely serrated, lower margin finely serrated, antegenicular right angled and genicular denticles acute. Hind tibia slightly enlarged from proximal to distal part, outer side and inner side without spine. Length of first segment of hind tarsi longer than third; first pulvillus normal, apex abtuse; second pulvillus degenerated and very small, apex acute; third pulvillus also degenerated, but larger than second pulvillus and slightly smaller than first pulvillus, apex slightly abtuse. Ovipositor narrow and long, length of upper valvulae 3.4 times its width, upper and lower valvulae with slender sawlike teeth. Length of subgenital plate nearly equal to its width, middle of posterior margin of subgenital plate with a triangular projecting.

Body dark brown. tegmina black and reticular stripe white. Hind wings black and outside transverse veins behind hind femur white. Outer side of hind femora with 2–3 indistinct black marks, downside and inner side yellow brown. Hind tibiae black, with brown at base.

Male. Similar to female, but smaller and narrower. Subgenital plate cone-shaped, apex acute.

Measurements (mm). Length of body: ♂ 5.5–6.0 mm, ♀ 6.5–7.0 mm; length of pronotum: ♂ 10.2–11.0mm, ♀ 11.5–12.0 mm; length of hind femur: ♂ 4.5–5.0mm, ♀ 5.2–5.8 mm.

Type material. Holotype: 1♀, 31 July 2018, collected by Wei-An DENG, EMHU . Paratypes. 21♂, 15♀, same data, type locality, EMHU .

Type locality. China, Yunnan prov., Mengla (Dachoushui) ( Figure 4 ), 21°22.2536ʹ N, 101°31.4651ʹ E, 680m alt .

Diagnosis. New species can be easily distinguished from other species of the genus Systolederus by outer side and inner side of hind tibia without spine. It also appears similarto Systolederus emeiensis Zheng, 1998 but differs from the latter by width of vertex 0.2 times width of an eye (width of vertex 0.5 times width of an eye in S. emeiensis ); upper margin of pronotum slightly undulating before shoulders and straight behind shoulders in profile (upper margin of pronotum distinctly undulated in S. emeiensis ); disc of pronotum flat (disc of pronotum behind shoulders with distinctly depressed in S. emeiensis ); posterior process of pronotum surpassing apex of hind tibia (posterior process of pronotum reaching middle of hind tibia in S. emeiensis ); width of visible part of tegmina distinctly wider than width of middle femora(width of visible part of tegmina equal to width of middle femora in S. emeiensis ); outer side and inner side of hind tibia without spine (outer side of hind tibia with three spines, inner side with four spines in S. emeiensis ).

Etymology. The specific epithet is derived from “ aspinus ”, meaning outer side and inner side of hind tibia without spine.

Distribution. P. R. CHINA: Yunnan.

Figures

FIGURE 1. Systolederus aspinus Deng, sp. nov., female, holotype: A—body in dorsal view; B—body in lateral view; Chead in dorsal view; D—head in lateral view; E—head in frontal view. (scale bar = 1 mm).

FIGURE 2. Systolederus aspinus Deng, sp. nov., female, holotype: A—posterior angles of lateral lobes of pronotum in dorsal view; B—left fore femur in lateral view; C—left mid femur in lateral view; D—left hind femur in lateral view; E—right hind tibia in dorsal view; F—left hind tibia in lateral view; G—left posterior tarsi in lateral view; H—Ovipositor in lateral view; Isubgenital plate of female in ventral view. (scale bar = 1 mm).

FIGURE 3. Systolederus aspinus Deng, sp. nov., male, paratype: A—body in dorsal view; B—body in lateral view; Csubgenital plate of in lateral view. (scale bar = 1 mm).

FIGURE 4. Collection locality of Systolederus aspinus Deng, sp. nov.