Suwallia kuandian Shi, Wang & Li, 2022

Shi, Wenju, Wang, Hongliang & Li, Weihai, 2022, A new species and three new records of Chloroperlidae (Plecoptera) from northeastern China, Zootaxa 5093 (5), pp. 584-592 : 585

Suwallia kuandian Shi, Wang & Li , sp. nov.

( Figs. 1 , 5a )

Material examined. Holotype male ( CAU): China, Liaoning Province, Dandong City, Kuandian Manchu Autonomous County, Quanshan Forest Farm , N 41.0684, E 124.9837, 2009.VII.5, Junchao Wang . Paratype: 1 male ( HIST), same data as holotype .

Adult habitus. Body color pale in ethanol. Head pale without markings or stigmata ( Fig. 1a ). Antenna pale brown, with basal segments paler. Pronotum slightly rugose, generally brownish yellow with pale medial stripe, lateral margins brown ( Fig. 1a ). Mesonotum and metanotum with brown U-shaped marks. Wings hyaline. Legs pale yellow. Median abdominal stripe is trapezoidal at each tergum and terminates at the posterior margin of tergum 7 ( Figs. 1b , 5a ).

Male terminalia. Tergum 9 medially golden-brown and moderately sclerotized, before the slightly produced posterior margin. Tergum 10 anterior margins with two narrowly separately paramedial sclerites, with invaginated subrectangular medial sclerite, which is arch-shaped in lateral view; posterior portion under epiproct widened, ca. half as long as wide ( Figs. 1b, 1c ). Hemitergal processes finger-shaped and anteromedially recurved. Epiproct knoblike and longer than wide, with stout posterolateral bifurcation ( Fig. 1b ). A distinct triangular aedeagal sclerite with darker lateral margins is visible through the cuticle of sternum 9 ( Fig. 1d ). Everted aedeagus mostly membranous, distinctly curved dorsally, with ventral sclerite subapical apical part with a triangular dorsal notch. The sclerite is medially oblong-elliptical with reticular dark filaments, laterally with closely set setae-like filaments in ventral view ( Figs. 1e, 1f ).

Female: Unknown.

Larva and egg. Unknown.

Distribution. China (Kuandian Manchu Autonomous County).

Etymology. The species is named after the type locality, Kuandian Manchu Autonomous County.

Diagnosis and remarks. The new species is superficially similar to S. sachalina (Zhiltzova, 1978) , but it is easily separated from that species externally by the head without markings and much wider posterior portion of medial sclerite. In S. sachalina , the head has large median markings, the posterior portion of medial sclerite nearly quadrate (fig. 13A, Alexander & Stewart 1999; figs. 5–7, Zhiltzova, 1978; figs. 521–523, Teslenko & Zhiltzova 2009). The aedeagal armartures of S. sachalina visualized through the cuticle are medially separated but those in S. kuandian sp. nov. are entire, and the everted armatures is generally a large triangular spinose patch posterior to a black transverse bar that differs much from S. kuandian sp. nov. The new species also shares similar posterolateral bifurcation on epiproct with S. bimaculata ( Okamoto, 1912) , S. kawaii Li & Li, 2021 (in Li. et al. 2021) and S. thoracica ( Okamoto, 1912) . However, the posterolateral bifurcate process in S. bimaculata , S. kawaii and S. thoracica is acute and subequal to or longer than epiproct (figs. 4B, 22B, Alexander & Stewart 1999; fig. 1b, Li. et al. 2021) whereas that process in S. kuandian sp. nov. is stout and much shorter than epiproct. Their shape of aedeagal armatures also differs: S. bimaculata has a V-shaped patch (fig. 4 D, Alexander & Stewart 1999), that structure in S. kawaii is plate-like with apical notch (fig. 2b, Li. et al. 2021) and the aedeagus of S. thoracica is only finely spinulated. Additionally, a similar large dark occellar markings extending forward to clypeus in those three species may easily tell externally from the colorless head in S. kuandian sp. nov.

Figures

FIGURE 1. Suwallia kuandian sp. nov. (male). a. Head and pronotum, dorsal view. b. Terminalia, dorsal view. c. Terminalia, lateral view. d. Terminalia, ventral view. e. Extruded aedeagus, ventral view. f. Extruded aedeagus, lateral view. T9: Tergum 9, HP: Hemitergal processes, Ep: Epiproct, Ms: Medial sclerite.

FIGURE 5. Abdominal, dorsal view (male). a. Suwallia kuandian sp. nov. b. Suwallia asiatica. c. Sweltsa illiesi. d. Alaskaperla longidentata.