Cerconychia multiseta Mo, Liu & Li, 2021

Mo, Raorao, Liu, Hao, Kong, Fanbin & Li, Weihai, 2021, Review of the genus Cerconychia Klapálek, 1913 (Plecoptera: Styloperlidae), with description of C. multiseta sp. nov., Zootaxa 5040 (4), pp. 582-588 : 583-586

Cerconychia multiseta Mo, Liu & Li , sp. nov.

( Figs. 1–4 )

Adult habitus. General color brownish yellow. Head mostly pale brown, stem and Y-arms of occipital suture brownish; head about as wide as pronotum ( Fig. 1a ). Biocellate, ocelli black. Antennae brownish to brown, scape and pedicel lighter; palpi brownish. Pronotum general rectangular, mostly pale brown but margins brown, much wider than long, with distinct rugosities; corners obtuse. Legs uniformly pale brown. Wing membrane hyaline, veins brownish.

Male ( Figs. 1–2 ). Forewing length 16.3–17.0 mm. Sternum 9 bearing transverse, elliptical brush patch of long setae near anterior margin, the base of the brush in lateral aspect about half length of the setal length ( Figs. 1c , 2a–2b ). Cercus yellow brown. Basal cercal segment sclerotized, brownish basally and apex darker; basal half bulbous, nearly as long as wide; distal half tapering to a subtriangular process; basal half armed with two to three irregular rows of ca. 13–15 medium sized conical sensilla, and distal half with four similar sized sensilla in a row before the apical (at least 30 setae) and smaller subapical (ca. 7 setae) clusters of long sharp setae ( Figs. 1b–1d , 2b–2d ). Cercal segments 2 with a single small dorsal spine, and cercal segments 3 also with 0–1 small dorsal spine ( Fig. 1b, 1d , 2c ).

Female ( Fig. 3 ). Color pattern generally similar to male. Subgenital plate slightly produced, posteriorly with a triangular notch between two small lateral projections.

Egg ( Fig. 4 ). Three eggs were dissected from a female terminalia. Length ca. 410 μm, width ca. 317 μm. Cross section round. Outline oval with distinct opercular line, but without anchor and collar; widest towards medial part. Chorionic surface brownish and mostly smooth, obscure irregular polygonal follicle cell impressions (FCIs) occur on opercular end (one is shown in dark lines: Fig. 4a ), indistinct FCIs also present on collar end of one of the eggs. Micropylar orifices small and mostly with rim, set along opercular line and forming a row.

Type material. Holotype: male ( HIST), CHINA, Guangxi Zhuang Autonomous Region, Baise City, Mt. Cenwanglaoshan , Dalongping , 1300 m, N 24°21’, E 106°15’, 2013.VII.28, light trap, Guoquan Wang . Paratypes: 8 males, 6 females ( HIST), light trap, same locality and date as holotype .

Etymology. The epithet refers to the multiple subapical setae of the first cercal segment.

Distribution. China (Guangxi Zhuang Autonomous Region).

Remarks. Cerconychia multiseta sp. nov. is most similar to C. sinensis Yang & Yang, 1995 from Hainan Province of southern China as redescribed below, sharing a similar short and blunt basal cercal segment. However, it can be distinguished from the latter by the basal cercal segment having many dorsal conical sensilla. It is also similar to C. flectospina from Yunnan Province of southwestern China and northern Vietnam, in having similar basal cercal segment covered with many dorsal sensilla. The new species can be easily separated from C. flectospina by the small dorsal spines of the second cercal segment and two clusters of bristle-like setae on tip of the basal cercal segment. In C. flectospina , the dorsal spines of the second cercal segment are larger, and the apex of the basal cercal segment lacks the two clusters of bristle-like setae.

Figures

FIGURE 1. Cerconychia multiseta sp. nov. (male). a. Head and pronotum, dorsal view. b. Terminalia, dorsal view. c. Terminalia, ventral view. d. Basal half of left cercus, oblique dorsal view.

FIGURE 2. Cerconychia multiseta sp. nov. (male). a. Sternum 9, ventral view. b. Terminalia, lateral view. c. Basal half of of left cercus, oblique lateral view. d. Apex of the basal segment of left cercus, oblique lateral view.

FIGURE 3. Cerconychia multiseta sp. nov. (female). a. Terminalia, ventral view. b. Subgenital plate,ventral view.

FIGURE 4. Cerconychia multiseta sp. nov. (egg). a. Entire egg, lateral view. b. Opercular end, apical view. c. Micropyle (arrow). d. Collar end, apical view.