Tyloperla yintiaolinga, Du, Zeng & Huo, 2025

Zeng, Liang-Liang, Huo, Qing-Bo & Du, Yu-Zhou, 2025, A new species of Tyloperla (Plecoptera: Perlidae) from China, with a supplementary description of T. bimaculata Li & Kong, 2020, Zootaxa 5661 (4), pp. 567-572 : 568-569

Tyloperla yintiaolinga, Du, Zeng & Huo , sp. nov.

Male. The coloration is generally yellow-brown ( Figs. 1A, 1C ), with a dark brown ocellar patch and a light brown nearly trapezoidal patch located anterior of the M-line ( Fig. 1B ). The distance between the ocelli is greater than the diameter of a single ocellus. Antennae yellow-brown, palpi light brown. The pronotum is trapezoidal, with its posterior portion being slightly narrower than the anterior portion. legs pale to yellowish brown. Wings subhyaline, veins light brown ( Fig. 1A ).

Forewing length 17.0–18.0 mm, body length 14.0– 15.5 mm (n=2). Tergum 6 has a small medial patch of sensilla basiconica. Tergum 7 has a small medial patch of sensilla basiconica ( Fig. 1C ). Tergum 8 has a large medial area with sparse sensilla basiconica; sclerotized posteriorly, featuring an elevated brown sclerite ( Fig. 1C ). Tergum 9 sclerotized laterally with a large medial membranous area; a weakly sclerotized spot bearing setae is present within membranous region ( Fig. 1C ). The hemitergal processes of tergum 10 are acute, finger-like, and curved inward, with a rounded basal callus ( Fig. 1C ).

A pair of membranous lobes present at the distal end of the dorsal surface of the penis tube ( Fig. 2A ); a dark sclerotized patch present at the base of the ventral surface ( Fig. 2B ). The endophallus is densely covered with small spines, except for an arrow-shaped, spine-free area dorsally ( Fig. 2A )’ distal 1/3 curves ventrally ( Figs. 2B–C ) and at the point of curvature there is a noticeable projection on the ventral surface that is densely covered with small spines ( Fig. 2C ).

Female. unknown.

Type material. Holotype: 1 male ( ICYZU), China: Chongqing, Wuxi County, Yintiaoling National Nature Reserve, Linkouzi , 1285 m, 2022.VI.21, leg Luyu Wang, Zhisheng Zhang . Paratype: 1 male ( ICYZU), same data as holotype .

Distribution. China (Chongqing)

Etymology. The specific name refers to type locality, Yintiaoling.

Diagnosis and remarks. The new species appears to be most closely related to T. bimaculata Li & Kong, 2020 , sharing similar terminalia and penis structures. However, T. yintiaolinga sp. nov. can be distinguished by the presence of a distinct ventral projection on the endophallus that is densely covered with small spines ( Fig. 2C ). In contrast, T. bimaculata possesses a pair of large ventral projections bearing large spines ( Figs. 4B–C ).

Figures

FIGURE 1. Tyloperla yintiaolinga sp. nov., male. A: habitus, dorsal view; B: head and pronotum, dorsal view; C: abdominal terminalia, dorsal view.

FIGURE 2. Tyloperla yintiaolinga sp. nov., male, everted penis. A: dorsal view. B: ventral view. C: lateral view.

FIGURE 4. Tyloperla bimaculata, male, everted penis. A: dorsal view. B: ventral view. C: lateral view.