Nemoura exterclava Zhu, Rehman & Du, 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 exterclava Zhu, Rehman & Du sp. nov.

Materials

Type status: Holotype. Occurrence: recordedBy: Huo Qing-Bo and Yang Xiao; individualCount: 1; sex: Male; lifeStage: Adult; occurrenceStatus: present; occurrenceID: 1796A96B-A20C-5BCA-B7D2-84076E14E824; Taxon: class: Insecta; order: Plecoptera ; family: Nemouridae ; genus: Nemoura ; specificEpithet: exterclava ; taxonRank: species; scientificNameAuthorship: Zhu, Rehman & Du; Location: continent: Asia; country: China; countryCode: CN; stateProvince: Guangdong; locality: Shaoguan City, Nanling National Forest Park, Lion Well, ; maximumElevationInMeters: 570 m; decimalLatitude: 24.907204; decimalLongitude: 113.061274; Identification: identifiedBy: Zhu Ya-Fei, Abdur Rehman, Du Yu-Zhou; dateIdentified: 10-02 - 2024; Event: year: 2024; month: 1; day: 17; Record Level: language: en; institutionCode: ICYZU; basisOfRecord: PreservedSpecimen

Type status: Paratype. Occurrence: recordedBy: Wang Xing-Min and Wang Zhi-Jie; individualCount: 1; sex: Male; lifeStage: Adult; occurrenceStatus: present; occurrenceID: 600C7FC4-432E-5CD6-991B-BBA5CD4FC4E7; Taxon: class: Insecta; order: Plecoptera ; family: Nemouridae ; genus: Nemoura ; specificEpithet: exterclava ; taxonRank: species; scientificNameAuthorship: Zhu, Rehman & Du; Location: continent: Asia; country: China; countryCode: CN; stateProvince: Guangdong; locality: Nanling, Jiuchongtian ; Identification: identifiedBy: Zhu Ya-Fei, Abdur Rehman, Du Yu-Zhou; dateIdentified: 10-02 - 2024; Event: year: 2007; month: 1; day: 17; Record Level: language: en; institutionCode: ICYZU; basisOfRecord: PreservedSpecimen

Description

Adult habitus: Head dark brown, antennae brown; head wider than pronotum, compound eyes dark brown, pronotum subquadrate, angles slightly blunt rounded with darker rugosity; wings subhyaline, veins dark brown, legs brown (Fig. 1 ).

Male

Body length 4.2 mm, fore-wing length 8.2 mm, hind-wing length 7.9 mm. Tergum 9 slightly sclerotised, with concave emargination in the middle and slightly protruding in the middle of posterior margin with several small spines (Fig. 2 A and Fig. 3 A). Hypoproct broad basally and tapering towards a triangular tip. Vesicle large, length approximately 2 × width (Fig. 2 B and Fig. 3 B). Tergum 10 slightly sclerotised, forming concavity below epiproct, without spines (Fig. 2 A and Fig. 3 A). Paraproct divided into 2 lobes; Inner lobe slightly sclerotised and narrow anteriorly, spanning approximately 2 / 3 length of outer lobe. Outer lobe slightly sclerotised and trapeziform at basal part; basal half of outer lobe is broad, sclerotised and becoming slender at 1 / 2 point; posteromedially becoming narrowed and darker, apex membranous and curving outwards, bearing many hairs, resembling the shape of golf club head (Fig. 3 B and Fig. 3 E). Epiproct nearly rectangular, trifurcate structure and 2 × longer than width. Dorsal sclerite broad basally, extending dorsolaterally, completely covering lateral aspects of epiproct. Epiproct apex pointed dorsally, slightly swollen and has a cone-shaped projection; medially two prongs arise on lateral sides from middle of epiproct and curved outwards, bearing 3 teeth at apex. Lateral arms distinctly sclerotised and run along lateral sides of epiproct (Fig. 3 A-C and Fig. 3 D). Ventral sclerite darkly sclerotised, broad basally, with blunt rounded tip medially and pair of parallel ridges, armed with two rows of seven spines ventrally. The ridges extend inwards and upwards to dorsal surface and longer than median part (Fig. 3 B). Cerci slightly sclerotised, curved in middle and perpendicular to the body, with scimitar-like black spine at end, which is more distinct in dorsal view (Figs 2 , 3 ).

Female

Unknown

Etymology

The name refers to the club-shaped process at the apical half of the outer paraproct lobe. Exter means outer, while clava means club.

Distribution

China (Guangdong Province).

Taxon discussion

The new species belongs to the ovocercia group and it is most similar to the Nanling Mountains species Nemoura alticalcaneum Mo, Wang & Li, 2020 in the epiproct. It can be distinguished from N. alticalcaneum , based on the following characteristics: the outer lobe, resembling the shape of a golf club head (Fig. 3 E). Epiproct ventral sclerite extends to the dorsal surface, forming two prong-like protrusions longer than median part, each bearing three thick spines apically, in dorsal view (Fig. 3 A). Cerci are folded in the middle, bearing long sclerotised prong at the apex (Fig. 3 E). In N. alticalcaneum , the paraproct has a complex outer lobe, apically with a high-heeled process. The ventral sclerite also extends to the dorsal surface, forming two horn-like protrusions, albeit shorter than the median part, with the apex featuring two blunt teeth, as seen in dorsal view ( Mo et al. 2022). Whereas in this new species, the epiproct apex lacks strong serrations on the dorsal margin and the cerci are complex, with a scimitar-like black spine at the end, which is significantly different from recorded speceies. The new species was collected from the road side in Nanling National Forest Park (Fig. 4 ).

Figures

Figure 1. Nemoura exterclava Zhu, Rehman & Du sp. nov., male. A prothorax, ventral view; B head and pronotum, dorsal view.

Figure 2. Nemoura exterclava Zhu, Rehman & Du sp. nov., male terminalia. A dorsal view; B ventral view; C lateral view.

Figure 3. Nemoura exterclava Zhu, Rehman & Du sp. nov., male. A terminalia, dorsal view; B terminalia, ventral view; C epiproct, ventral view; D epiproct, lateral view; E left paraproct, ventral view.

Figure 4. Habitat of Nemoura exterclava Zhu, Rehman & Du sp. nov. in Nanling National Forest Park, Lion Well, Guangdong Province, China (Photograph by Huo Qing-Bo).