Nemoura cerciserrata Zhu, Du & Rehman, 2024

Zhu, Ya-Fei, Rehman, Abdur & Du, Yu-Zhou, 2024, Two new species of Nemoura Latreille and a new combination of Amphinemura Ris (Plecoptera, Nemouridae) from the Nanling Mountains Region of China, Biodiversity Data Journal 12, pp. e 121451-e 121451 : e121451-

Nemoura cerciserrata Zhu, Du & Rehman sp. nov.

Materials

Type status: Holotype. Occurrence: individualCount: 1; sex: Male; lifeStage: Adult; occurrenceStatus: present; occurrenceID: 6BB7C443-9554-526F-A0E8-381294D03443; Taxon: class: Insecta; order: Plecoptera ; family: Nemouridae ; genus: Nemoura ; specificEpithet: cerciserrata ; taxonRank: species; Location: continent: Asia; country: China; countryCode: CN; stateProvince: Guangdong; locality: Shaoguan City, Shixing county, Chebaling Nature Reserve ; decimalLatitude: 24.711731; decimalLongitude: 114.236787; Identification: identifiedBy: Zhu Ya-Fei, Abdur Rehman, Du Yu-Zhou; Event: year: 2024; month: 1; day: 15,; Record Level: institutionCode: ICYZU; basisOfRecord: PreservedSpecimen

Type status: Paratype. Occurrence: individualCount: 1; sex: Male; lifeStage: Adult; occurrenceStatus: present; occurrenceID: 29C5728A-30CD-5A41-9352-E82704EF2766; Taxon: class: Insecta; order: Plecoptera ; family: Nemouridae ; genus: Nemoura ; specificEpithet: cerciserrata ; taxonRank: species; Location: continent: Asia; country: China; countryCode: CN; stateProvince: Guangdong; locality: Shaoguan City, Shixing county, Chebaling Nature Reserve ; decimalLatitude: 24.711731; decimalLongitude: 114.236787; Identification: identifiedBy: Zhu Ya-Fei, Abdur Rehman, Du Yu-Zhou; Event: year: 2022; month: 1; day: 31; Record Level: institutionCode: ICYZU; basisOfRecord: PreservedSpecimen

Description

Adult habitus: Head dark brown, wider than pronotum; antennae pale brown; compound eyes dark brown. Pronotum subquadrate, angles slightly blunt rounded with darker rugosity. Wings subhyaline, veins dark brown. Legs pale brown (Fig. 5 ).

Male

Body length 4.5 mm, fore-wing length 8.5 mm, hind-wing length 8.2 mm. Tergum 9 slightly sclerotised, with concave emargination in the centre and with several small hairs along posterior margin (Fig. 6 A and Fig. 8 A). Hypoproct broad basally and tapered towards blunt rounded tip. Vesicle rod-like, length approximately 3 × width (Figs. 7 B and 9 B). Tergum 10 strongly sclerotised, forming concavity below epiproct (Fig. 6 A and Fig. 8 A). Paraproct divided into two lobes: inner lobe sclerotised, shallow arcuate shape and approximately 3 / 4 length of outer lobe. Outer lobe slightly sclerotised presenting triangular resemblance at base. The outer lobe narrows at halfway point and forms vesicle-like structure at tip (Fig. 6 B, Fig. 7 C and Fig. 8 F). Epiproct has membranous heart-shaped process at the top, 2 × longer than width. Dorsal sclerite broad basally, extending dorsolaterally, completely covering lateral aspects of epiproct and part of ventral aspect (Fig. 6 A and Fig. 7 A). Lateral arms distinctly sclerotised and run along lateral sides of epiproct. Ventral sclerite of epiproct darkly sclerotised, broad basally, forming pair of parallel ridges with 7-9 spines ventrally; these ventral ridges extend upwards to form an antler-like protrusion with two small blunt spines on tip (Fig. 7 B and Fig. 8 D). Cerci slightly sclerotised with two spines, with strong, spur in the middle and bears sclerotised black pointed spur at the end (Figs 6 , 7 ).

Diagnosis

Female

Unknown

Etymology

The latin cerciserrata refers to a strong, curving spur in the middle of the cerci. Serrata means toothed, like a saw.

Distribution

China (Guangdong Province).

Taxon discussion

The new species belongs to the ovocercia group and it is most similar to the Nemoura longistyla Zhao, Rehman & Du, 2023 , as it possesses a comparable epiproct with elongated protrusions at the apex ( Zhao et al. 2023). It can be distinguished from the latter by the following characteristics: in Nemoura sp. nov., the ventral sclerite of epiproct extends upwards to form an antler-like protrusion, with two small blunt spines on the tip. The features are not distinctly visible in the dorsal view (Figs 7 , 8 ), while the ventral sclerite extends upwards to form a horn-like protrusion and the apex has three small teeth in N. longistyla , which are more distinct in the lateral view. In addition, there is a strongly sclerotised sawing spine in the middle of the cerci, which is significantly different from N. longistyla (Figs 6 , 7 , 8 ).

Figures

Figure 5. Nemoura cerciserrata Zhu, Du & Rehman sp. nov., male. A prothorax, ventral view; B head and pronotum, dorsal view.

Figure 6. Nemoura cerciserrata Zhu, Du & Rehman sp. nov., male terminalia. A dorsal view; B ventral view; C lateral view.

Figure 7. Nemoura cerciserrata Zhu, Du & Rehman sp. nov. Male, A epiproct, dorsal view. B epiproct, ventral view; C apical part of the cercus with its terminal spine; D basal part of the cercus with its strong spur and paraproct.

Figure 8. Nemoura cerciserrata Zhu, Du & Rehman sp. nov. male. A Male terminalia dorsal view; B Male terminalia ventral view; C epiproct, dorsal view; D epiproct, ventral view; E epiproct, lateral view; F left paraproct, ventral view.