Phanoperla cheni, Mo & Wang & Wang & Li, 2021

Mo, Raorao, Wang, Ying, Wang, Guoquan & Li, Weihai, 2021, Review of Phanoperla (Plecoptera, Perlidae) from China, ZooKeys 1052, pp. 71-81 : 71

Phanoperla cheni sp. nov.

Figures 1 , 2 , 3 , 4

Adult habitus.

General body color yellowish brown. Biocellate, black rings around ocelli nearly connected, with a small brown marking covering ocelli. Head pale, with an M-shaped brown marking on frons; antenna brown, flagellum darker, and palpi brown; compound eyes black, large and bulging; head wider than pronotum. Pronotum rectangular, corners round with distinct brown rugosities (Fig. 1A, B ). All legs brown, femora paler; wing membrane pale, veins brown; Rs two-branched, the angle Cu2 arising from Cu1 typical of the genus. Abdominal segments generally brownish.

Male (Figs 1 - 4 ). Forewing length ca 8.0 mm; hindwing length ca 6.7 mm. Sternum 5-7 with distinct medial ventral brush. Tergum VIII with posterior margin barely produced and sclerotized without sensilla basiconica. Tergum IX with two lateral groups of sensilla basiconica (Figs 1C , 2 ). Hemitergal processes of tergum X relatively stout, strongly sclerotized, the sharp tip curved outward.

Aedeagus (Figs 3 , 4 ). Aedeagal envelope membranous with a large ventral patch of spinules. Aedeagal tube short, S-shaped in lateral aspect and dorsally expanded at apex: dorsal sclerite slender, band-shaped; basal surface with two ventrolateral groups of tiny spines; apical half fully covered with stout spines. Aedeagal sac as long as tube, curved ventrad, mostly covered with brown spines, but base bare: a pair of lateral black spine patches located in ventral surface of median half; apical half with a scarf-shaped band of larger black spines; apical part tubular, fully armed with tiny golden-brown spines.

Female. Unknown.

Type material.

Holotype: male (HIST), China: Guangdong Province, Shaoguan City, Shixing County, Chebaling National Natural Reserve, 24.72°N, 114.26°E, 327.4 m alt., 2020.IX.13, Chen Xulong leg.

Etymology.

The patronym honors the collector of the holotype; a noun (name) in genitive case.

Distribution.

China (Guangdong Province). The new species is known only from the Chebaling National Natural Reserve of Guangdong, which is in the Nanling Mountains. The Reserve has a subtropical monsoon climate, with heat and abundant rainfall throughout the year.

Remarks.

The male genitalia and aedeagal tube of the new species is similar to that of P. wieng Sivec & Stark, 2010 from Phrae Province of Thailand. However, in that species, the apical part of aedeagal tube is less expanded dorsally (compare Figs 3D , 4A, B with Sivec and Stark 2010: fig. 39-41). In addition, the aedeagal sac of P. wieng bears a dorsomedian hump and a pair of dorsobasal lobes, which are lacking in the straight aedeagal sac of the new species. Both species bear a similar spine arrangement of the aedeagal sac, but in the new species, a pair of small patches of black spines are present on the ventrolateral surface of the median half of the aedeagal sac, while the spine patches are lacking in P. wieng . The new species is also similar to P. vietnamensis Zwick, 1986 in its male terminalia, but their aedeagi are obviously different (compare Zwick 1986: figs 2, 3 with Figs 3 , 4 ). In addition, the new species lacks two irregular rows of sensilla on tergum 9.

Figures

Figure 1. Phanoperla cheni sp. nov. (male) A adult habitus, dorsal view B head and pronotum, dorsal view C terminalia, dorsal view. Scale bars: 0.50 mm.

Figure 2. Phanoperla cheni sp. nov. (male) A terminalia, oblique dorsal view B terminalia after being cleared, dorsal view C terminalia after being cleared, lateral view D terminalia after being cleared, oblique dorsal view. Scale bars: 0.50 mm.

Figure 3. Phanoperla cheni sp. nov. (male) A aedeagus before eversion, ventral view B aedeagus before eversion, dorsal view C aedeagus before eversion, lateral view D aedeagus, ventral view. Scale bars: 0.25 mm.

Figure 4. Phanoperla cheni sp. nov. (male) A aedeagus, dorsal view B aedeagus, lateral view C apical part of aedeagus, dorsal view D apical part of aedeagus, lateral view. Scale bars: 0.20 mm.