Duolandrevus (Eulandrevus) longlouensis, Zheng & Ma, 2021

Zheng, Yanna & Ma, Libin, 2021, Taxonomy of the genus Duolandrevus Kirby, 1906 (Orthoptera: Gryllidae; Landrevinae) from China with a new species of the subgenus Eulandrevus Gorochov, 1988, Zootaxa 4942 (2), pp. 252-268 : 254-256

Duolandrevus (Eulandrevus) longlouensis sp. n.

( Figs. 1–2 )

Type material. Holotype. male. China: Hannan , Tongguling, Aug. 13, 2019, coll. He, Zhixin and Zhang, Tao ( SNNU) ; Paratypes. 2 males and 2 females. China: Hannan , Tongguling, Aug. 13, 2019, coll. He, Zhixin and Zhang, Tao ( SNNU) .

Measurements (mm). Male (n=3): BL 17.32±0.21; HL 2.71±0.07; HW 4.62±0.21; PL 2.53±0.02; PW 4.40±0.10; FWL 5.95±0.01; HFL 9.18±0.02; HTL 6.66±0.08; Female (n=2): BL 16.11±0.05; HL 2.77±0.01; HW 4.58±0.10; PL 2.91±0.05; PW 4.69±0.11; FWL 3.25±0.18; HFL 9.87±0.12; HTL 7.00±0.02; OL 9.62±0.18.

Etymology. The specific epithet “ longlouensis ” refers to the town of collection locality of specimens.

Diagnosis ( Fig. 1 ). Body size small. Head slightly wider than pronotum. Tegmina reaching the fifth abdominal tergite. Basal region of forewing is elevated and slightly higher than the rest of forewing surface. Oblique veins four; the first oblique vein diverging laterally, one branch connected to basal region, the other linked to CuA vein. Mirror inconspicuous, replaced by multiple irregular cells; of them, most of proximal ones somewhat larger than the apical ones. The chord and nearby cells are connected by two veins. Apical field armed with reticulated veins (numerous cells). Middle lobes of epiphallus short and thick. Lateral lobes of epiphallus almost three times longer than the middle lobe; its tip apically bifurcate and included angle between branches formed as right angle; each branch armed with acute apex, and the lower branch about two times longer than the upper one. Epiphallus ventrally possessing two lateral projections, the anterior one short and somewhat as long as epiphallic middle lobe, and the hind one about 1.5 times longer than the former. Ectoparameres acute apically, about two times longer than epiphallic middle lobe.

Description. Male: Body sized small for this genus. Head smooth and light, slightly wider than pronotum. Vertex broad and flattened, weakly inclined. Frontal rostrum slightly convex in frontal view, slightly wide dorsally viewed, almost equal to the width of antennal scape. Face transversely broad, area of antennal socket and area of lower side of eye distinctly depressed, between two areas ridged; cheek shiny and plump. Median ocellus small and transversely ovoid; lateral ocelli large and rounded. Clypeus extremely small, distal narrowed portion is short. Labrum rhombus-like, with angle lateral margins and concave apically. End section of maxillary palpi longer than the third, depressed and widened, with rounded apex; end section of labial palpi longer than remainder sections, depressed and widened, with truncated tip.

Pronotum flattened and widened; anterior margin concave and arch-like, posterior margin straight; middle of both lateral edges slightly convex. Hind wings undeveloped, small (reaching posterior margin of metanotal gland) and entirely covered by forewings. Tegmina reaching the fourth abdominal tergite. The basal region of forewing elevated and slightly higher than the rest of the forewing surface. Oblique veins four, the first one diverging laterally, with one branch connected to the basal region and the other linked to CuA vein. Mirror inconspicuous, replaced by multiple irregular wing cells, of them, most of proximal ones somewhat larger than the apical ones. A chord vein and wing cells are connected by two transverse veins. Apical field armed with reticulated veins. Lateral field bearing five Sc branches.

Legs densely hairy. Both inner and outer tympana oval-like and the inner slightly larger than outer one. Hind tibiae equipped with spines on proximally half portion and spurs on distal part (numbered 4:4); and with five apical spurs, of them, the inner numbering two and the ventral one shorter than the dorsal; and the outer apical spur numbering three, with the ventral one shortest and remainder ones nearly equal to each other; as a whole, outer apical spurs longer than the inner ones. First tarsus of hind leg armed with six spines respectively on sides; claw expanded proximally and possessing blunt teeth. Super-anal plate simple, trapezoid-like.

Genitalia ( Fig. 2 ): Genitalia tapering distally in dorsal view. Middle lobes of epiphallus short and thick. Lateral lobes of epiphallus about three times longer than the middle lobe; its tip apically bifurcate and included angle between branches formed as right angle, and each branch armed with acute apex, and the lower branch about two times longer than the upper one. Epiphallus ventrally possessing two lateral projections, the anterior one short and somewhat as long as epiphallic middle lobe, and the posterior one about 1.5 times longer than the former. Ectoparameres acute apically, about two times longer than epiphallic middle lobe.

Coloration: Body color brown. Femora light brown. Tegmina surfaces yellowish brown, lateral field brown. Cercus yellow-brown proximally and apically brown.

Female: Similar to male. Head vertex strongly inclined. Tegmina reaching the second abdominal tergite, with longitudinal veins, which shortened inside and gradually lengthening outward. Ovipositor brown, smooth and arrow-shaped, almost equal to the length of posterior femur.

Remark. This species is very similar to D. (E.) obsidianu s ( Chen et al., 2019) and D. (E.) dendrophilus in features of body and genitalia, but it has distinct epiphallus and ectoparameres. Shape of lateral lobes bifurcation and length of ectoparameres of new species is different from the others. Epiphallus lateral lobe branched as right angle, and posterior lateroabdominal projection of epiphallus short, apex not reaching lower branch of lateral lobe of epiphallus.

Figures

FIGURE 1. Body of Duolandrevus (Eulandrevus) longlouensis sp. n.. A. male; B. female. Scale bar:10 mm.

FIGURE 2. Genitalia of Duolandrevus (Eulandrevus) longlouensis sp. n.. A. dorsal viewed; B. lateral viewed; C. ventral viewed.