Abaxisotima macrocaudata, Wang & Shi, 2012

Wang, Gang & Shi, Fu-Ming, 2012, The genus Abaxisotima Gorochov (Orthoptera: Tettigoniidae: Phaneropterinae) from China, Journal of Natural History (J. Nat. Hist.) 46 (41 - 42), pp. 2537-2547 : 2541-2545

Abaxisotima macrocaudata sp. nov.

( Figures 2 A–B; 3A, C, E, H, K; 4D–G, H; 5B)

Male

Body size medium. Head ovoid. Fastigium verticis narrower than scape of antennae, with weak dorsal sulcus, apex acute, not contacting fastigium frontis. Eyes slightly ovoid, conspicuously protruding. Anterior margin of pronotum approximately straight, posterior margin obtusely rounded and slightly elevated, middle transverse sulcus v-shaped, lateral margins rounded, without lateral carinae; lateral lobe longer than high, humeral sinus indistinct. Tegmen comparatively short and broad, broadest before middle, costal edge convex, anal edge almost straight, apex rounded, merely surpassing apex of posterior femur; radial vein of tegmen with single radius sector originating behind middle of tegmen, and with three other, more or less subparallel, branches behind radius sector; left tegmen with stridulatory vein stout, a semicircular cell and additional longitudinal vein in more distal part of stridulatory area, right tegmen with mirror rounded, with a comparatively large transparent cell as well as additional longitudinal vein. Hind wings longer than tegmina for about 5 mm. Procoxa unarmed, protibiae with auditory tympana open on both sides, with one internal and one to four external dorsal spines, five or six internal and four external ventral spines; mesotibiae with four or five internal and one external dorsal spines, seven or eight internal and eight to ten external ventral spines; metatibiae with 24–25 internal and 20–22 external dorsal spines, five or six internal and six to ten external ventral spines. All femora dorsally smooth, and ventrally with longitudinal groove, without spines on both dorsal and ventral sides, and with one or two spines on genicular lobe.

Tenth abdominal tergite broad, apical margin slightly concave in middle. Epiproct obtusely triangular. Cercus long, extending beyond posterior margin of subgenital plate, basal part cylindrical, bearing a long, slightly s-shaped inner process; distal part widened, lateral margins curled upwards, armed with spinules along margins. Genitalia with a pair of lobes, membranous ( Figure 4F ). Subgenital plate with lateral areas upcurved at basal portion; apical lobes tapering from base to middle, of same width at distal portion, apex slightly dilated on lateral sides and directed backwards, longer than half of subgenital plate, notch between lobes slightly rounded-angle, without styli.

Female

Similar to male in general appearance. Projecting parts of hind wings shorter than those of male (c. 2.5 mm). Cerci conical. Ovipositor short, curved upward, dorsal

margin and apex of ventral margin serrulate; gonangulum broad, inferior valvae with process at base. Subgenital plate almost triangular without apical notch.

Colouration

Overall colour green. Eyes brown. Antennae dark brown with sparse white annulation. dorsum of occiput, disc of pronotum and dorsal part of left tegmen brown, anterior and posterior margins of pronotum and stridulatory vein dark. Tegmina green with

clear brown veins, and some brown spots in cells. Legs and cerci pale brown in male; legs slightly yellowish green in female.

Measurements (mm)

Length of body: male 18.0, female 18.5; length of body and wing: male 32.0, female 32.5; length of pronotum: male 4.7, female 5.5; width of pronotum: male 2.2, female 2.0; length of tegmen: male 22.0, female 22.7; largest width of tegmen: male 6.5, female 6.0; length of anterior femur: male 7.5, female 8.5; length of middle femur: male 9.5, female 10.0; length of posterior femur: male 19.5, female 19.5; length of body and ovipositor: 25.0; length of ovipositor 7.0; largest width of ovipositor 2.5; length of cercus: male 5.5; length of subgenital plate: male 4.5.

Type material

Holotype: male, Jinfoshan , Chongqing, 21 July 2003, collected by Wang Jian-Feng.

Paratypes: one male, Daguan, Yunnan, 24 July 2006, one male, Yanjin , Yunnan, 27 July 2006, both collected by Guo Xiao ; one female, Jinfoshan , Chongqing, 22 July 2003, collected by Yuan Cai-Xia and Liu Yu-Shuang.

Discussion

The new species is distinguished from A. bicolor by small size (length in A. bicolor : body 27 mm, tegmen 34 mm, posterior femur 26 mm), lateral lobe of pronotum unicolorous, characteristic cercus and subgenital plate in male ( A. bicolor has much longer body and wings than all known congeners). It resembles other Abaxisotima species in size and appearance, but is distinctly distinguished by the shape of cerci and subgenital plate in male ( Figure 4 D–E, G). Female ovipositor with small process at base of inferior valves ( Figure 3H ).

Etymology

The new specific name is derived from the Latin words macro and caudatus, which refers to the large-scale of male’s cercus.

Distribution

China (Chongqing, Yunnan) .

Figures

Figure 2. (A, B) Abaxisotima macrocaudata sp. nov., (C, D) Abaxisotima forcipiforma sp. nov.: (A, C) male; (B, D) female.

Figure 3. (A, B) Male stridulatory area of left tegmen, (C, D) male stridulatory area of right tegmen, (E, F) male subgenital plate in ventral view, (K, L) female subgenital plate in ventral view, (G–J) base of ovipositor in lateral view. (A, C, E, H, K) Abaxisotima macrocaudata sp. nov.; (B, D, F, I, L) Abaxisotima forcipiforma sp. nov.; (G) Abaxisotima multipunctata; (J) Abaxisotima spiniforma.

Figure 4. (A–C, I) Abaxisotima forcipiforma sp. nov.; (D–G, H) Abaxisotima macrocaudata sp. nov.: (A, D) male subgenital plates and cerci in lateral view; (E) abdominal apex in dorsal view (paratype from Yunnan); (B, F) epiprocts and exposed parts of male genitalia in dorsal view; (C, G) male subgenital plates in ventral view; (H, I) ovipositors in lateral view; scale bars: 1 mm.