Sweltsa brevihamula, Dong & Cui & Li, 2018

Dong, Wenbin, Cui, Jianxin & Li, Weihai, 2018, A new species of Sweltsa (Plecoptera: Chloroperlidae) from Sichuan Province of southwestern China, Zootaxa 4418 (4), pp. 388-392 : 388

Sweltsa brevihamula sp. nov. ( Figs. 1–12 )

Adult habitus. General color greenish. Head with a large, quadrate, median dark area; compound eyes dark, ocelli with dark rings; antennae pale but distal flagella brown ( Figs. 1–2 ). Pronotum with brown symmetrical medial pattern ( Figs. 1–2 ). Meso- and metathoracic nota with brown U-shaped marks. Wings hyaline; legs pale. Abdominal terga 1–8 with median brown stripe; stigma of terga 2–7 trapezoidal, with tergum 1 being triangular and tergum 8 rounded ( Fig. 1 ). Cerci pale with long setae.

Male. Body length 9.4 mm; forewing length 8.0 mm; hindwing length 7.0 mm. Tergum 9 sclerotized, anteromedial portion membranous, transverse ridge sclerotized and band-shaped ( Fig. 3 ), the ridge in lateral aspect forming triangular process ( Figs. 4 –5 ). Epiproct: in dorsal view, parallel-sided for most of its length with apex narrowed; in lateral view the apex up-curved, ventral portion of the apex slightly swollen after KOH treatment ( Figs. 3–7 , 10–12 ). Aedeagus membranous without hairs, with a small triangular subapical lateral lobe, apical half tubular, much more slender than basal portion; basal portion bulbous, with conical basolateral and mesoventral lobes ( Figs. 8–9 ).

Female and larva. Unknown.

Type material. Holotype male ( HIST), CHINA: Sichuan Province, Mianyang City, Pingwu County, Laohegou National Nature Reserve , Xiaopiangou , 2377m, 32°30'37'' N, 104°38'33'' E, 2012. V.25, coll. Sipei Liu.

Etymology. The specific epithet refers to the short (“brev”), up-curved hook-like apex (“ hamula ”) of the epiproct.

Remarks. Sweltsa brevihamula can be recognized by the up-curved apex of the epiproct. Sweltsa brevihamula is similar to S. baiyunshana Li, Yang & Yao, 2014 in general habitus, but males can be distinguished from the latter species by the pronotum without a brown margin and an almost parallel-sided epiproct without an upraised, tongue-like cap apically (See Li et al. 2014, figs. 8–11), but with an up-turned apex. The new species is also related to S. longistyla ( Wu, 1938) , but the apex of the epiproct of S. brevihamula in lateral aspect is up-curved.

Figures

FIGURE 1.Sweltsa brevihamula sp.nov. (holotype male):1. Adulthabitus,dorsal view.

FIGURES 2–9. Sweltsa brevihamula sp. nov. (holotype male): 2. Head and pronotum, dorsal view. 3. Terminalia, dorsal view. 4. Terminalia,lateralview.5. Terminalia,dorsalview.6.Epiproct,dorsalview.7.Epiproct,lateral view.8. Aedeagus,ventrolateral view. 9. Aedeagus,lateral view.

FIGURES 10–12. Sweltsa brevihamula sp. nov. (holotype male): 10. Terminalia, lateral view. 11. Epiproct, closer lateral view. 12. Epiproct,lateral view.11–12 showing epiproct before KOH treatment.