Sweltsa hamula Chen & Du, 2017

Rehman, Abdur, Huo, Qing-Bo & Du, Yu-Zhou, 2022, A new species of Sweltsa Ricker, 1943 (Plecoptera, Chloroperlidae) and a supplementary description of Sweltsa hamula Chen & Du, 2017 from China, Biodiversity Data Journal 10, pp. 86347-86347 : 86347

Sweltsa hamula Chen & Du, 2017

Materials

Type status: Other material. Occurrence: recordedBy: Zhi-Teng Chen , Yue Shen ; individualCount: 4; sex: 1 male, 3 female; lifeStage: adult; occurrenceStatus: present; Taxon : namePublishedInID: https://doi.org/10.11646/zootaxa.4337.2.8; scientificName: Sweltsa hamula Chen & Du, 2017; acceptedNameUsage: Sweltsa hamula; kingdom: Animalia ; phylum: Arthropoda ; class: Insecta ; order: Plecoptera ; family: Chloroperlidae ; genus: Sweltsa ; taxonRank: species; taxonomicStatus: accepted; Location : continent: Asia ; country: China; countryCode: CN; stateProvince: Sichuan; locality: Mianyang City , Pingwu County, Wanglang National Nature Reserve , Baixionggou River ; minimumElevationInMeters: 2886; verbatimLatitude: 33.0068; verbatimLongitude: 104.027; Identification: identifiedBy: Abdur Rehman & Du Yu-Zhou; dateIdentified: 24-04-2022; Event: year: 2017; month: 6; day: 25; Record Level: language: en; institutionCode: ICYZU; basisOfRecord: PreservedSpecimen. Type status: Other material. Occurrence: recordedBy: Zhi-Teng Chen , Yue Shen ; individualCount: 3; sex: 2 male, 1 female; lifeStage: adult; occurrenceStatus: present; Taxon : namePublishedInID: https://doi.org/10.11646/zootaxa.4337.2.8; scientificName: Sweltsa hamula Chen & Du, 2017; acceptedNameUsage: Sweltsa hamula; kingdom: Animalia ; phylum: Arthropoda ; class: Insecta ; order: Plecoptera ; family: Chloroperlidae ; genus: Sweltsa ; taxonRank: species; taxonomicStatus: accepted; Location : continent: Asia ; country: China; countryCode: CN; stateProvince: Sichuan; locality: Mianyang City , Pingwu County, Wanglang National Nature Reserve , Muyangchang ; minimumElevationInMeters: 2589; verbatimLatitude: 32.9699; verbatimLongitude: 104.1029; Identification: identifiedBy: Abdur Rehman & Du Yu-Zhou; dateIdentified: 24-04-2022; Event: year: 2017; month: 6; day: 22; Record Level: language: en; institutionCode: ICYZU; basisOfRecord: PreservedSpecimen .

Description

Supplementary description

Male head with median dark brown marking covering frons and ocellar areas. Pronotum disc with median brown band, medially pale with light rugosities, margins dark brown (Fig. 5 A). Mesonotum and metanotum with dark U-shaped marking. Tergum 9 anteriorly with prominent transverse ridge (Fig. 5 B). Tergum 10 divided medially, forming sclerotised shield-like structure. Epiproct wide and elliptical, medially slightly upraised, sides with upward dark margins from base to basal half dorsally; then gradually tapering to sharp apex, apically narrow and thread-like, bending backwards forming hook-shaped structure (Fig. 5 B and Fig. 6 A). Laterally sclerotised, constricted from base to basal half, then curved outwards, apically back-curved and forming hook-shaped apex (Fig. 5 C and Fig. 6 B).

Female

Body length 9.0-9.5 mm, forewing length 8.0-8.5 mm, hind-wing length 7.0-8.0 mm (n = 4). Habitus generally similar to male (Fig. 7 ). Abdominal tergum stripes same as male, except for tergum 8 with median brown elliptical mark; lateral dark patches present anteriorly on segments 2-4. Posterior margin of sternum 8 bears large rounded subgenital plate ventrally, reaching near to half of sternum 9. Subgenital plate posteromedially bears lobe-like structure, seems like U-shaped narrow patch and covered with many hairs (Fig. 7 B).

Distribution

China, Sichuan Province, Wanglang National Nature Reserve.

Taxon discussion

This species was established by Chen and Du (2017). They did not provide any closely-related species maybe because this species is easily distinguishable from all Sweltsa by the epiproct backward hook. However, here we can add that this species epiproct structure is partially similar to Sweltsa illiesi Zhiltzova & Levanidova, 1978 ( Teslenko and Zhiltzova 2009) in general appearance and can be easily distinguished from this species by the epiproct backward hook. Besides this, we also describe the female of this species, which is not reported in the original description. The female subgenital plate of the S. hamula species is wide, rounded and posteromedially bears a small U-shaped patch and is covered with hairs (Fig. 7 B). In contrast, the subgenital plate of S. illiesi is subtriangular and medially with a round patch and margin of the plate is covered with hairs (fig. 520 in Teslenko & Zhiltzova 2009). These features easily distinguish female of this species.

Figures

Figure 5. Sweltsa hamula Chen & Du, 2017. Male A head and pronotum; B terminalia dorsal view; C terminalia dorsolateral view.

Figure 6. Sweltsa hamula Chen & Du, 2017. Male A epiproct dorsal view; B epiproct lateral view.

Figure 7. Sweltsa hamula Chen & Du, 2017. Female A head and pronotum; B terminalia ventral view.