Sichuana longilamina Gu, Zheng & Yue, 2023

Gu, Jun-Jie, Zheng, Chengjie, Jiang, Su-Rong & Yue, Yanli, 2023, Phylogeny of genus Sichuana Shen & Yin, 2020 (Orthoptera, Tettigoniidae, Tettigoniinae) with four new species from Sichuan, China, Deutsche Entomologische Zeitschrift 70 (2), pp. 337-355 : 337

Sichuana longilamina Gu, Zheng & Yue sp. nov.

Material examined.

Holotype: ♂, Guergou , Li County, Ngawa Tibetan and Qiang Autonomous Prefecture, Sichuan Province, China, (31°30'29"N, 102°58'35"E, alt., ca. 2400 m), coll. Cheng-Jie Zhengand Yuan Wei, VIII-2022 . Paratypes: 1♀, same data as in holotype .

Diagnosis.

Differs from all other Sichuana species by notch of tenth abdominal tergite of male trapezoidal (Fig. 9 F ); male cercus strongly incurved at an acute angle and pointing dorsally (Fig. 9E, F, H ), inner tooth pointing dorsally (Fig. 9E ); apex of male subgenital plate elongate, the long styli about one-third of length of subgenital plate (Figs 9H , 11C ); notch of female tenth abdominal tergite trapezoidal (Fig. 9G ).

Etymology.

The specific epithet is derived from a combination of the Latin ' longus ' meaning long and ' lamina ' meaning plate, to describe its male subgenital plate which is distinctly longer than the cerci. Chinese name:长板川螽.

Measurements

(mm). Body (head to tip of abdomen): 27.7♂, 31.38♀; pronotum: 8.36♂, 8.6♀; tegmen: 17.42♂, 8.76♀; mirror of right tegmen (from fore to hind): 4.34♂; hind wing: 7.82♂, 5.54♀; protibia: 7.58♂, 10♀; profemur: 7.4♂, 8.5♀; mesotibia: 9.42♂, 10.94♀; mesofemur: 8.52♂, 9.62♀; metatibia: 21.12♂, 26.28♀; metafemur: 20.98♂; 25.64♀; ovipositor: 23.34.

Description.

Male. Body size medium. Frons flat, slightly oblique. Frontal fastigium and clypeofrontal sulcus black. Face light-colored. Occiput convex. Vertical fastigium broad, slightly wider than scape. Median ocellus visible. Compound eye broadly round and bulging outwards, surrounded by black coloration extending backward to form a band. Filiform antennae inserted on the inner sides of the compound eyes, scapus robust, much thicker than pedicel, flagellum tapers toward the apex, covered with short setae (Fig. 9A-D ).

Pronotum saddle-shaped, smooth, nearly equal to profemur in length. Disc of prozona with a broadly obtuse concavity in the middle of each side, anterior margin of pronotum slightly concave and posterior margin blunt, median carina faintly indicated in prozona, absent in metazona, lateral carina distinct in metazona, faintly indicated in prozona. Lateral lobe of pronotal length greater than depth, with a light-colored stripe along the lateral margin, sometimes not obvious, humeral sinus obvious (Fig. 9A-D ). Prosternum with a pair of longer cone-shaped spines (Fig. 11A ). Mesosternum with a pair of acute triangular lobes, height greater than width. Metasternum with a pair of rounded triangular lobes, width distinctly greater than height (Fig. 11E ). Thoracic auditory spiracle elongated and elliptical, partially covered by lateral lobe of pronotum.

Tegmen slightly shorter than twice the length of pronotum, with clear longitudinal and cross veins. Tegmen folded downward along the M+CuA, the dorsal field flat, with a transverse lacuna in the middle. Tegmen almost the same width as disc of metazona from base to the middle, then gradually narrowing in dorsal view. Lateral field of the tegmen distinctly broadened (Fig. 9I ). ScA weak, very close to anterior margin, ending at the middle of the anterior margin or fused with branch of ScP. ScP strong, with 3-5 branches. R forked to RA and RP distally, RA very close to ScP, sometimes distally fused with ScP (Fig. 10B ). M+CuA branched to M and CuA before intersection of handle and CuA, slightly before middle of tegmen. M forked to MA and MP before the origin of the handle, but position of their separation unstable (Fig. 10A, B ). Stridulatory file with about 34 teeth (Fig. 11E ). Mirror on right tegmina pentagonal, length greater than width (Fig. 10B ). Hind wing rudimentary.

Legs. Prothoracic leg: genicular lobes armed with 1-2 internal spinules and externally unarmed. Dorsal procoxa with a long spine. Profemur with 2-4 internal black spinules ventrally; protibia with a slit-like auditory tympanum on both sides; protibia with 2 external spurs dorsally, with 5 spurs on each side ventrally; protibia with an external apical spur dorsally and with a pair of apical spurs ventrally. Mesothoracic leg: genicular lobes armed with 0-1 external spinule and 1 internal spinule; mesofemur with 2-3 external black spinules and 0-2 internal black spinules ventrally; mesotibia with 2 external spurs and 3 internal spurs dorsally, with 5 spurs on each side ventrally; mesotibia with an internal apical spur dorsally and with a pair of apical spurs ventrally. Metathoracic leg: genicular lobes unarmed; metafemur with sparse black spinules on each side ventrally; metatibia with a row of spines of different sizes on each side dorsally, with a row of sparse tiny spurs on each side ventrally, progressively denser toward the apex; metatibia with a pair of apical spurs dorsally, with two pairs of apical spurs ventrally, one pair distinctly larger.

The apical area of the tenth abdominal tergite with a wide lacuna in the middle covered with many tiny granular protrusions. The posterior margin of the tenth abdominal tergite with a trapezoidal notch at the middle, its sides forming a pair of round, blunt lobes (Fig. 9E, F ). Cercus conical and pileous, strongly incurved at an acute angle after its middle and points dorsally, apex acute; with a hook-like, incurved inner tooth placed at base of cercus, tapering and curving from the base to the apex and pointing dorsally (Fig. 9E, F, H ). Subgenital plate length greater than width, with lateral carinae, middle posterior margin with a deep notch, apex of subgenital plate elongate, far beyond cercus; stylus slender, about one-third the length of subgenital plate, longer than notch (Fig. 11C ). Epiproct triangular. Titillator L-shaped, with 2-3 rows of denticles, and denticles on upper part of the apical portion distinctly larger than those on the lower part (Fig. 11D ).

Female. Generally similar to male, but body slightly larger. Tegmen shorter than pronotum, extending to the third abdominal tergum (Fig. 9C, D ). Hindwing micropterous, longer than half of the pronotum. Cercus conical and pileous. The apical area of the tenth abdominal tergite with a wide depression in the middle, near the posterior margin of ninth abdominal tergite. Tenth abdominal tergite with a U-shaped excision in the middle of posterior margin, sides of excision form a pair of round blunt projections (Fig. 9G ). Subgenital plate nearly trapezoid, width greater than length, middle of posterior margin with a wide notch (Fig. 11B ). Ovipositor slightly shorter than metafemur, slightly decurved distally (Fig. 9C, D ).

Remarks.

S. longilamina sp. nov. differs from S. feicui He, 2020, S. cryptospina Shen & Yin, 2020, S. planicercata sp. nov. and S. curvicercata sp. nov. by the following: pair of cone-shaped spines on prosternum more slender; pair of lobes on mesosternum acutely triangular, height greater than width (Fig. 11 A ); male cerci strongly incurved at an acute angle slightly after their middle and gradually curved dorsally (Fig. 9E, F, H ); apex of male subgenital plate extended far beyond cerci (Figs 9H , 11C ); styli longer, about one-third the length of subgenital plate (Fig. 11C ). Furthermore, S. longilamina sp. nov. differs from S. planicercata sp. nov. and S. curvicercata sp. nov. by: tenth abdominal tergite with a pair of round blunt projections on posterior margin; in male tegmina M+CuA branching to M and CuA before origin of handle; lateral field of male tegmina distinctly broadened.

These four species also differ from S. longilamina sp. nov. in the shape of the inner teeth, the denticles on the titillators, the morphology of the tenth abdominal tergite, the shape of the stridulatory file, and the number of stridulatory teeth.

Figures

Figure 9. A-D. Body of Sichuana longilamina sp. nov. A, B. Male holotype; C, D. Female paratype; A, C. Dorsal view; B, D. Lateral view; E. Male terminal abdomen with artificially unfurled cerci in dorsal view for showing inner tooth; F. Male terminal abdomen in dorsal view; G. Female terminal abdomen in dorsal view; H. Male terminal abdomen in lateral view; I. Male left tegmen in lateral view.

Figure 10. A, B. Tegmina of Sichuana longilamina sp. nov. in dorsal view. A. Left tegmen; B. Right tegmen.

Figure 11. Sichuana longilamina sp. nov. A. Thorax in ventral view; B. Female subgenital plate; C. Male subgenital plate; D. Titillator; E. Stridulatory file on underside of male left tegmen.