Chinoperla longispina Yan & Li, 2022

Yan, Yanhua, Wang, Jie, Wang, Mingju & Li, Weihai, 2022, A new species and new record of Chinoperla Zwick, 1980 (Plecoptera: Perlidae) from Yunnan Province, China, Zootaxa 5168 (5), pp. 553-560 : 556-560

Chinoperla longispina Yan & Li , sp. nov.

( Figs. 4–6 )

Diagnosis. Head with large dark brown patch under brownish M-line and a triangular dark brown stigma forward of M-line. Median sclerite of male tergum 9 trapezoidal with posterior notch, covered by 6–7 stout wart-like spines. Aedeagal tube with a pair of prominent, membranous, dorsoapical lobes and a smaller, nipple-like, dorsal lobe. Aedeagal sac apically with a long median spine which is swollen at apex.

Adult habitus ( Figs. 4 , 5A ). General color dark brown. Head brown, with large dark brown patch under Mline and a triangular dark brown stigma forward of brownish M-line; biocellate; antennal scape brown, flagellum paler. Pronotum brownish, trapezoidal with brown rugosities and dark midline; anterior portion wider with pointed anterior corners, posterior corners obtuse. Legs brown but basal half of femora pale brown and knees dark brown; wings brown with pale area anterior to RA, veins dark brown, Sc of forewing short ( Fig. 4B ); cerci dark brown.

Male ( Figs. 5B–D ). Body length 6.5–6.7 mm (N=2). Forewing length 8.0– 8.5 mm, hindwing length 7.0– 7.3 mm (N=4). Sterna 3–5 with hair brushes. Dark median process of tergum 9 strongly sclerotized, trapezoidal with small posteromedial notch, about 2X as long as maximum width of posterior margin, covered by several brown wart-like spines. Hemitergal processes slender and finger-like, about 2X as long as maximum width of basal callus, with an obtuse tip; parallel-sided at distal half in lateral view; basal callus slightly enlarged, with patch of sensilla basiconica.

Aedeagus ( Fig. 6 ). Aedeagal tube sclerotized dorsomedially, forming a slender rhomboid sclerite. Sac not fully everted, apical half curved dorsad, with one ventroapical and a pair of dorsoapical membranous lobe; bearing a slender elongate spine directed dorsally, the spine ca. as long as aedeagal sac and its apical portion distinctly enlarged, appearing as arrow tip in ventral aspect.

Female, nymph and egg. Unknown.

Type material. Holotype: male ( CAU), China: Yunnan Province, Xishuangbanna Prefecture, Mengla County, Menglun Town , 55km east of Jinghong City , 22.0788 N, 101.1434 E, 900 m, 2007.IV.27–28, leg. Hui Dong. Paratypes: 3 males ( CAU), same data as holotype .

Etymology. The specific epithet refers to the long distal spine of the aedeagal sac.

Distribution. China (Yunnan Province).

Remarks. The new species seems closely related to Chinoperla gorohovi Sivec & Stark, 2010 by similar head and leg patterns and aedeagal spine of aedeagal sac. However, the new species can be easily separated from C. gorohovi by shorter, spinulose median sclerite of tergum 9, a slender rhomboid sclerite on aedeagal tube, presence of a nipple-like ventral lobe, and much longer apical spine of aedeagal sac (compare Figs. 5A, C , 6B–D , with Figs. 2B–D , 3A, C , in present study, and figs. 2–4 in Sivec & Stark (2010)).

The aedeagal armatures of C. longispina sp. nov. is also similar to the Vietnamese C. sila Sivec & Stark, 2010 . However, in C. sila , basal portion of aedeagal tube has lateral hairs which is not found in the new species and median process of tergum 9 of C. sila is more circular than that of C. longispina (compare Figs. 5C , 6A, C and figs. 22–24 in Sivec & Stark (2010)).

Figures

FIGURE 2. Chinoperla gorohovi Sivec & Stark, 2010 (male). A. Head and pronotum, dorsal view. B. Terminalia before NaOH treatment, dorsal view. C. Cleared terminalia, dorsal view. D. Cleared terminalia, oblique lateral view.

FIGURE 3. Chinoperla gorohovi Sivec & Stark, 2010 (male)A.Aedeagus, dorsal view.B.Aedeagus, ventral view. C.Aedeagus, lateral view.

FIGURE 4. Chinoperla longispina sp. nov. (male). A. Adult habitus, dorsal view. B. Forewing.

FIGURE 5. Chinoperla longispina sp. nov. (male) A. Head and pronotum, dorsal view. B. Terminalia before NaOH treatment, dorsal view. C. Cleared terminalia, dorsal view. D. Cleared terminalia, oblique lateral view.

FIGURE 6. Chinoperla longispina sp. nov. (male) A. Aedeagus, dorsal view. B. Aedeagus, ventral view. C. Aedeagus, lateral view. D. Aedeagus, apical spina, dorsal view.