The first record of the family Chloroperlidae (Plecoptera) from the Guangxi Zhuang Autonomous Region of southern China, with description of a new species of Sweltsa Ricker, 1943 Author Mo, Raorao 0000-0001-9480-092X Department of Plant Protection, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China. & Guangxi key laboratory of Agric-Environment and Agric-Products Safety and National Demonstration Center for Experimental Plant Science Education, Agricultural College, Guangxi University, Nanning, Guangxi 530004, China. & 1689832746 @ qq. com; https: // orcid. org / 0000 - 0001 - 9480 - 092 X 1689832746@qq.com Author Ye, Jianping 0000-0003-2721-2671 Guangxi Maoershan National Nature Reserve, Guilin, Guangxi 541001, China. & 215196437 @ qq. com; https: // orcid. org / 0000 - 0003 - 2721 - 2671 215196437@qq.com Author Wang, Guoquan 0000-0003-1693-1654 Guangxi key laboratory of Agric-Environment and Agric-Products Safety and National Demonstration Center for Experimental Plant Science Education, Agricultural College, Guangxi University, Nanning, Guangxi 530004, China. & wangguoquan 0 @ 163. com; https: // orcid. org / 0000 - 0003 - 1693 - 1654 Author Li, Weihai 0000-0003-2803-4416 Department of Plant Protection, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China. & lwh 7969 @ 163. com; https: // orcid. org / 0000 - 0003 - 2803 - 4416 text Zootaxa 2020 2020-09-22 4853 2 275 282 journal article 9107 10.11646/zootaxa.4853.2.8 4cd6f6f1-b7dc-4544-aaa0-63db83057922 1175-5326 4519852 EFC3ECB6-BE34-463E-9979-132A1392FF60 Sweltsa bilobata sp. nov. ( Figs. 1-6 ) Adult habitus ( Figs. 1a, 1b , 3a, 3b ). General color greenish, becoming pale in ethanol. Head with a large, rectangular median dark area; compound eyes dark, ocelli with dark rings; antennae pale but distal flagella brown ( Figs. 1a , 2a ). Pronotum with brown symmetrical medial pattern. Wing membrane transparent; legs pale. Abdominal terga 1-7 with median brown triangular stripe, tergum 8 with median brown elliptical stripe. Cerci pale with long setae. Male ( Figs. 1a , 2 a-2e, 3a, 4a–4h, 6a, 6b). Body length 8.1-8.3 mm (from head excluding antennae to tip of forewing); forewing length 7.0- 7.2 mm ; hindwing length 5.8-6.0 mm. Lateral hair brush typical, present at abdominal segments 6-9. Tergum 9 sclerotized except medial portion membranous, transverse ridge strongly sclerotized and band-shaped, the ridge in lateral aspect forming triangular process ( Figs. 2b, 2 d-2e, 3a, 4a, 4c-4d). Sternum 9 with broad trapezoidal subgenital plate, posterior margin truncate ( Figs. 2c , 4b ). Tergum 10 with a pair of distinctly sclerotized transverse lateral bands, the medial portion between the bands greatly enlarged in the shield-like darkly sclerotized basal anchor, the anchor slightly wider than long, and with typical membranous groove and paragential plates between hemiterga, basal bar concave ventrally and abruptly up-curved dorsad medially, thus L-shaped in lateral view ( Figs. 2b, 2 d-2e, 3a, 4a, 4c,4d). Epiproct claviform, parallel-sided for its most length, but slightly constricted medially, subapically tapering to a sharp tip in dorsal view; in lateral view, ventroapical half moderately enlarged and flat, dorsal subapical portion with a indistinct notch and the tip rounded ( Figs. 2b, 2 d-2e, 3a, 4a, 4c, 4d, 6a, 6b). Aedeagus membranous, trapezoidal in ventral aspect, with a pair of finger-like apical lobes and a flat semicircular dorsoapical lobe ( Figs. 2c , 4 a-4c, 4e-4h). Female ( Figs. 1b , 3b , 5 a-5d). Body length ca. 11.2 mm (from head excluding antennae to tip of forewing); forewing length ca. 9.3 mm ; hindwing length ca. 8.0 mm. Habitus generally similar to male except only female abdominal terga 1-7 with median brown subtriangular stripe ( Figs. 1b , 3b ). The posterior margin of sternum 8 forming a large trapezoidal subgenital plate, reaching near posterior margin of sternum 9 and expanding in lateral view seems scalloped, with a small triangular posteromedial notch. FIGURE 2 . Sweltsa bilobata sp. nov. (male). a. Head and pronotum, dorsal view. b. Terminalia, dorsal view. c. Terminalia, ventral view. d. Terminalia, lateral view. e. Terminalia, oblique lateral view. Scale bars: a. 1 mm; b-e. 0.5 mm. FIGURE 3 . Sweltsa bilobata sp. nov. a. Male abdomen, dorsal view. b. Female abdomen, dorsal view. Scale bars: 1 mm. Type Material. Holotype male ( HIST ), CHINA : Guangxi Zhuang Autonomous Region , Guilin City , Xing’an County , Maoershan National Natural Reserve , Jiuniutang , E 110°25’1” , N 25°52’16’’ , 1961-2000 m , 2020.VI.22 , Mo R . R ., Yang Q.C. et al . Paratypes , 1 male and 1 female ( HIST ), same data and date as holotype . Etymology . The name refers to a pair of finger-like apical lobes of the aedeagus. Latin “bi-” means two, double, and “lobus” means lobes. Distribution . China ( Guangxi Zhuang Autonomous Region). FIGURE 4 . Sweltsa bilobata sp. nov. (male). a. Terminalia after being cleared, dorsal view. b. Terminalia after being cleared, ventral view. c. Terminalia after being cleared, lateral view. d. Terminalia after being cleared, oblique lateral view. e. Aedeagus, ventral view. f. Aedeagus, lateral view. g. Aedeagus, dorsocaudal view. h. Aedeagus, oblique dorsocaudal view. Scale bars: a-d. 0.5 mm; e-h. 0.25 mm. FIGURE 5 . Sweltsa bilobata sp. nov. (female). a. Head and pronotum, dorsal view. b. Terminalia, ventral view. c. Terminalia, lateral view. d. Terminalia, oblique lateral view. Scale bars: 1 mm. Remarks . The new species is similar to the Indian species, S. assam Zwick, 1971 in sharing the similar head pattern, tergum 9, the dorsal shape of the epiproct and general shape of female subgenital plate. However, S. bilobata may be easily separated from S. assam by the following features: pronotum with larger brown medial pattern, dorsal aspect of epiproct nearly straight in lateral view. In S. assam , the pronotum bears a narrow pale brown medial pattern; apical half of the epiproct has a noticeable subapical indentation and seemingly downcurved in lateral view (figs. a & d in Zwick 1971 ). In addition, the head pattern, tergum 9 and the general shape of epiproct of the new species is also similar to S. longistyla ( Wu, 1938 ) from China . However, in S. longistyla , the medial pattern of pronotum is narrower; the epiproct is slender and stiletto-shaped, gradually tapering to apex with a blunter apical point, and ventroapical half is not enlarged; basal anchor is small and cup-like; the female subgenital plate is smaller and triangular with apex larger rounded medial notch (figs. 14-27 in Li et al. 2014 ), not as in S. bilobata , the medial pattern of pronotum is wider; epiproct is claviform, mostly parallel-sided except for medial constriction, and only subapically tapering toward tip with sharper apex in dorsal view; ventroapical half is obviously enlarged in lateral view; basal anchor is larger and shield-like. Additionally, usually the females of most Sweltsa species have notched subgenital plates. The female subgenital plate of new species is broader and trapezoidal with a small triangular posteromedial notch, which is helpful separating females of the two species.