Pycnoscelus undulatus Wang & Che 2025, sp. nov.
Creators: name: Wang, Yi-Shu
name: Dong, Xiao-Jiao
name: Wang, Zong-Qing
name: Che, Yan-Li
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Blattodea
Blaberidae
Pycnoscelus
Pycnoscelus undulatus

description: Pycnoscelus undulatus Wang & Che sp. nov.
Fig. 5
Type material.
Holotype. China • male; Guangdong Prov., Guangzhou City, Longyandong Forest Park; 28 June 2015; Zhi-Wei Qiu & Yong-Quan Zhao leg.; SWU -B-BB 120201. Paratypes. China • 1 male; same collection data as holotype; SWU -B-BB 120202 • 1 male; Guangxi Prov., Hepu County, Shiwan Town; 14 May 2016; Yi-Zhou Liu leg.; SWU -B-BB 120203 • 2 females & 1 nymph; Guangxi Prov., Hepu County, Shiwan Town; 14 May 2016; Yi-Zhou Liu leg.; SWU -B-BB 120204 to 120206.
Differential diagnosis.
The male of this species is similar to P. vietnamensis Anisyutkin, 2002 and P. gorochovi Anisyutkin, 2002 in the shape of supra-anal plate, which has a deep emargination at the right posterolateral side, but P. undulatus sp. nov. differs strongly from these two species by its dark reddish brown pronotum, light marking on facial part between eyes, and the bulky right style (compare Fig. 5 H with Anisyutkin 2002: figs 15, 16).
Description.
Male (holotype). General color brownish yellow (Fig. 5 A, B). Facial part of head dark reddish brown, with an indistinct three-radial stripe between eyes; other part of head, clypeus, labrum and antennae brownish yellow; maxillary palps brownish yellow with reddish brown maculae; eyes black, ocellar spots whitish. Pronotum reddish brown, with two yellow areas anterolaterally (Fig. 5 E). Tegmina brownish yellow. Abdomen yellowish brown to reddish brown. Legs and cerci yellowish brown.
Head slightly exposed. Ocelli subrectangular; interocular space distinctly less than the distance between ocellar spots and antennal sockets (Fig. 5 F). Pronotum subpentagonal, densely punctured. Tegmina and wings fully developed, exceeding the end of abdomen. Front femur Type C 1. Hind metatarsus not quite as long as other segments combined; four proximal tarsomeres with well-developed pulvilli, the one on the first tarsomere occupying almost the whole length of the segment; claws symmetrical and simple; arolium large. Supra-anal plate asymmetrical with hind margin deeply concave at the right side. Paraprocts of blaberid type, asymmetrical. Cerci stout at base (Fig. 5 G). Subgenital plate asymmetrical, with the right posterolateral corner slightly obtuse and upturned. Left style absent, right style broadly trigonal (Fig. 5 H).
Male genitalia. Right phallomere with caudal part of sclerite R 1 T irregular and widened; R 2 short and curved; a well-developed projection arising from the junction of R 1 T and R 2; R 3 forked caudally, R 4 plate-like, R 5 absent (Fig. 5 I, J). Sclerite L 2 D divided into basal and apical parts: the basal part forked caudally with the inner margin indented; the apical part well sclerotized and more uniform in width than in other Pycnoscelus species, posterior margin toothed; apical membrane covered with microtrichia (Fig. 5 K). Sclerite L 3 hook without an apical incision, inner curved margin with a sharp convexity at apex; sclerite L 4 U present and divided into two parts (Fig. 5 L).
Females. Thoracic segments and abdominal tergum black with minute punctures, abdominal sterna and legs reddish brown. Tegmina and wings absent.
Measurements (mm).
Male, body length including tegmen: 22.2–23.0; pronotum length × width: 4.3–4.5 × 6.3–7.1; tegmen length: 17.0–20.1. Female, body length: 16.1–20.6; pronotum length × width: 4.35–4.44 × 7.36–7.37.
Etymology.
The species epithet is derived from the Latin word undulatus, which refers to the caudal edge of basal part of sclerite L 2 D undulated.
description: Published as part of Wang, Yi-Shu, Dong, Xiao-Jiao, Wang, Zong-Qing & Che, Yan-Li, 2025, Taxonomic update of Pycnoscelus Scudder, 1862 (Blattodea, Blaberidae, Pycnoscelinae), with descriptions of two new species from China, pp. 45-67 in ZooKeys 1231 on pages 45-67, DOI: 10.3897/zookeys.1231.141287