Cryptoperla bisaccata, Li & Li, 2025

Li, Hanyu & Li, Weihai, 2025, A new species and new record of Cryptoperla Needham, 1980 (Plecoptera: Peltoperlidae) from China, Zootaxa 5660 (2), pp. 273-278 : 274-276

Cryptoperla bisaccata sp. nov.

( Figs. 1–2 )

Adult habitus. Body color brown ( Fig. 1 ). Biocellate ( Fig. 1c ). Head brown and hairy, with a large, dark brown elliptical medial area interrupted by M-line ( Fig. 1c ); compound eyes black ( Fig. 1c ); antennae and palpi brown ( Fig. 1c ). Pronotum dark brown, rectangular, with distinct, symmetrical brown rugosities and a brownish posteromedial area ( Fig. 1a ). Wing membrane brownish, veins brown ( Fig. 1a–b ); legs brown ( Fig. 1a–b ). Abdominal segments mostly pale brown to yellowish ( Fig. 1b ).

Male. Body length 6.4mm,forewing length 13.6mm, hindwing length 11.7mm (n=1).Tergum 10posteromedially with a triangular process, and rounded, hairy posterolateral portions ( Fig. 2e ). Basal cercal segment ca. 4.5 times longer than basal width ( Figs. 2a, c ), with sparse basal and dense apical fringe of long bristles along medial margin ( Figs. 2a, c ); apex of basal segment curved dorsad, swollen in lateral view, armed with a single stalk and dark brown spur extending to midlength of 5th cercomere with a sharp hook ( Figs. 2c–d ). Vesicle of sternum 9 small ( Fig. 2b ). Aedeagus membranous, basal half naked and trapezoidal in shape ( Fig. 2f ); basoventrally with a pair of lateral saclike protrusions and with a medial irregular swelling between a pair of raised lateral lobes ( Fig. 2f ); hairless between lobes ( Figs. 2a–c ).

Female, egg, and larva. Unknown.

Type material. Holotype: male ( HIST), China: Shaanxi Province, Hanzhong City, Foping County, Liangfengya , 1400 m, 33.6914° N, 107.9464° E, 2023.VII.13, leg. Weihai Li, Yao Zhang.

Distribution. China: Shaanxi Province, known only from the type locality in the Liangfengya of Foping county.

Etymology. The name refers to the saccular aedeagus ( Fig. 2f ). Latin “bi-” means two, and “saccatum” means saccular.

Remarks. Although the general morphological characteristics of Cryptoperla are similar across species, basal cercal segments and aedeagi can be easily distinguished. For C. bicornata Mo, Liu, Wang, Li & Murányi, 2021 , the spur is slightly curved outward with a sharp tip (see figs. 4d, 5a, 5d in Mo et al. 2021) and the aedeagus has a pair of lateral horn-like processes basoventrally (figs. 3c–f, Mo et al. 2021). On C. cunicidata Mo, Liu, Wang, Li & Murányi, 2021 , the spur arms include a sharp tip (figs. 3c–f in Mo et al. 2021) and the aedeagus is rabbit-shaped in ventral view (figs. 5a–d in Mo et al. 2021). Additionally, C. akha Stark, 1989 , C. formosana (Okamoto, 1912) , C. ishigakiensis (Kawai, 1968) , and C. stilifera Sivec, 1995 each have a single, long, and straight spur of the basal cercal segment with a sharp tip ( Mo et al. 2021; Stark & Sivec 2007). Cryptoperla nangonshana Huo & Du, 2018 , distributed in Shaanxi Province, has several clusters of long and thick, anteriorly angled bristles on the inner edge of the neck section 1-6 (figs. 7–9 in Huo & Du 2018). The new species C. bisaccata sp. nov. has a spur with a sharp hook ( Figs. 2a, c–d ) and saccular aedeagus ( Figs. 2a–c, f ), which is clearly different from other related species.

Figures

FIGURE 1. Cryptoperla bisaccata sp. nov., male adult habitus. a: dorsal view. b: ventral view. c: head and pronotum, dorsal view.

FIGURE 2. Cryptoperla bisaccata sp. nov., adult male. a: terminalia and aedeagus, dorsal view. b: terminalia and aedeagus, ventral view. c: terminalia and aedeagus, lateral view. d: cerci, dorsal view. e: tergum 10, ventral view. f: aedeagus, ventral view.