Polionemobius gyirongensis, Wang & Ma, 2023

Wang, Rui & Ma, Li-Bin, 2023, Polionemobius gyirongensis sp. nov. from Tibet, China, and the identification of the species Polionemobius ebony Wu & Ma, 2022 and its close relative (Orthoptera: Trigonidiidae; Nemobiinae), Zootaxa 5339 (4), pp. 390-396 : 391-394

Polionemobius gyirongensis sp. nov.

Chinese name: ḂĨṱ‼ẽ

Figs. 1A, 1B , 2A, 2B , 3A, 3B, 3C

Type materials. Holotype. China: Male , Gyirong County, Tibet, 2.v.2023, Libin Ma coll. ( SNNU) . Paratypes. 9 males and 8 females, same collection information as the holotype.

Etymology. The name refers to its type locality, Gyirong County.

Description. Male. Body-sized small. Head small and pilose, almost equal to the width of the pronotum. Occiput with five longitudinal bands, one in the center, one adjacent to the inner side of the eye, and one behind the eye. Two inner bands of the eye extend from both sides of the frontal rostrum. The inner side of the eyes armed with noticeable hollows. Median ocellus circular, significantly smaller than the lateral ocellus. Lateral ocelli oblong. Vertex broad and flattened, weakly inclined. Frontal rostrum wider than antennal scape. Antennal scape round shield-shaped. Cheek shiny and plump. Labrum rhombic, angular on both sides, with concave edges. Maxillary palpus densely pilose, the end section of the maxillary palpi horseshoe-shaped, slightly longer than the third; the end section of the labial palpus wide and flat, equal in length to the total length of the remainder two. Pronotum trapezoidal, posterior margin slightly narrower than the anterior, both anterior and posterior margin slightly protrude. Pronotum and its lateral portions both armed with long and short bristles, the central sulcus obvious. Both sides of the central sulcus in the pronotum armed with an oval notch.

Tegmina not reaching the end of the abdomen. Basal field more than one-half of Pronotum. Oblique vein one and chord vein three; mirror irregularly quadrangular and divided into three chambers. Apical field rather short. Hind wings invisible.

Anterior tibia only bearing an outer tympanum. Inner dorsal spurs of the posterior tibia numbered four and the outer numbered three. Apical spurs six, both inner and outer three, inner apical spurs longer than outer.

Male genitalia. The base of the epiphallus significantly concave and ossified, and the epiphallic middle lobe membranous, the membranous part of the epiphallus densely covered with black spots. In lateral view, the ectoparamere rod-shaped, with slight enlargement from the ventral to the dorsal side of the ectoparamere.

Female. Similar to males. Tegmina only with longitudinal veins. Ovipositor dagger-shaped, three-quarters of the posterior tibia.

Coloration. Body darkish brown. Antennae darkish brown and gradually becoming lighter from tip to base. Head and the base of bristles on the pronotum having black-brown dots, and longitudinal bands of the occiput yellowish brown. The junction between the pronotum and pronotum lateral lobe yellowish brown, outer hind femur with yellow stripes.

Measurements (mm). Male (n= 9). BL 6.48±0.8, HL 1.04±0.03, HW 1.64±0.1, PL 1.17±0.07, PW 1.94±0.05, FWL 3.16±0.17, HFL 3.83±0.06; Female (n=8). BL 5.63±0.09, HL 01.03±0.03, HW 1.75±0.08, PL 0.94±0.05, PW 1.89±0.11, FWL 2.5±0.27, HFL 4.16±0.45, OL 2.92±0.13.

Remarks. This species has a similar appearance to Polionemobius yunnanus (Haoyu & Fumin, 2014) ( Figs. 1 , 2 ). The genitalia of P. gyirongensis sp. nov. is larger than P. yunnanus and P. yunnanus has multiple wrinkles on the epiphallus, but the new species does not ( Fig. 3 ). The ectoparamere of P. gyirongensis sp. nov. is finger-shaped and extremely inward-curved, and the ectoparamere of P. yunnanus is slightly sharp ( Fig. 3 ).

Figures

FIGURE 1. Living habits. A–B. P. gyirongensis sp. nov. C–D. P. yunnanus. A, C. male; B, D. female.

FIGURE 2. Body of P. gyirongensis sp. nov. (A, B) and P. yunnanus (C, D). A, C. male; B, D. female. Scale bar: 2 mm.

FIGURE 3. Genitalia. A–C. P. gyirongensis sp. nov.; D–F. P. yunnanus. A, D. dorsal view; B, E. lateral view; C, F. ventral view.