Allacta bifolium Li & Wang, 2024

Li, Bian-Lun, Hu, Peng-Hui, Guo, Lin, Che, Yan-Li & Wang, Zong-Qing, 2024, Discovery of five new species of Allacta from Yunnan and Hainan, China (Blattodea, Pseudophyllodromiidae), ZooKeys 1191, pp. 1-21 : 1

Allacta bifolium Li & Wang sp. nov.

Fig. 2A-M

Type material

(All in SWU). Holotype: China • male; Yunnan Prov., Baoshan City, Baihualing; 1253 m; 24 Aug., 2015; Xin-Ran Li, Zhi-Wei Qiu leg. Paratypes: China • 3 males; same data as holotype; 1 male, Yuxi City, Xinping County, Mount Ailao, 1933 m, 12 May, 2016, Lu Qiu, Zhi-Wei Qiu leg.

Diagnosis.

This species can be easily distinguished from its congeners by the small leaf-shaped tegmina, the absence of hind wings as well as the right side of the right stylus with a long, finger-like protrusion.

Measurements

(mm). Male, pronotum length × width: 3.1-3.2 × 4.9-5.2, tegmina length: 1.9-2.3, overall length: 11.2-12.5.

Description.

Male. Body dark brown (Fig. 2A, B ). Face brown with a yellowish-brown transverse crescent band below antennal sockets (Fig. 2C ). Lateral portions of thorax yellowish brown, including pronotum, mesonotum and metanotum as well as most of the tegmina (Fig. 2A ). Tibiae yellowish brown with base dark brown. Cerci dorsally with basal half blackish brown, terminal parts yellowish brown; each segment ventrally with basal half dark brown and apical half light brown.

Vertex with interocular space greater than the distance between antennal sockets. The third, and fourth maxillary palpi of approximately the same length, slightly longer than the fifth (Fig. 2E ). Pronotum subparabolic with hind margin nearly straight. Tegmina greatly reduced (Fig. 2H ), slightly surpass mesonotum, without veins. Hind wings absent. Anteroventral margin of front femur Type B3 (Fig. 2F ). Pulvillus only present on the fourth tarsomere (Fig. 2G ). Tarsal claws symmetrical and unspecialized, arolia present.

Male abdomen and genitalia. Abdominal terga unspecialized. Supra-anal plate short, symmetrical, and hind margin arc-shaped. Paraprocts simple and plate-like (Fig. 2I ). Subgenital plate asymmetrical with two styli arising in two concavities of hind margin. The right stylus longer than the left; the right cylindrical with a finger-like projection on right side; the left stylus nearly elliptical (Fig. 2J ). The interstylar margin broadly V-shaped. Left phallomere complex (Fig. 2F ). Median phallomere (L2vm) stem slender rod-like, slightly curved, apex blunt round with several small spines, base sharp with a large spine subsidiary sclerite; median phallomere subsidiary sclerite (R3) C-shaped clavate (Fig. 2L ). Hooked phallomere (R2) on the right of subgenital plate, with pre-apical incision (Fig. 2M ).

Etymology.

The Latin words bi - means pair, double, and folium means leaf, referring to the tegmina being degenerated into small leaf-like structures and hind wings absent.

Distribution.

China (Yunnan).

Figures

Figure 2. Allacta bifolium sp. nov., male holotype A dorsal view B ventral view C head, ventral view D pronotum, dorsal view E maxillary palpi, ventral view F front femur, ventral view G tarsus and tarsal claws of front leg H tegmen, dorsal view I supra-anal plate and paraprocts, ventral view J subgenital plate, dorsal view K left phallomere, dorsal view L median phallomere, dorsal view M hook-like phallomere, dorsal view. Scale bars: 5 mm (A, B); 1 mm (C-M).