Nemoura cerciserrata Zhu, Du & Rehman 2024, sp. nov.
Creators: name: Zhu, Ya-Fei
name: Rehman, Abdur
name: Du, Yu-Zhou
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Nemouridae
Nemoura
Nemoura cerciserrata

description: 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).
description: Published as part of 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, pp. e 121451 in Biodiversity Data Journal 12 on page e121451, DOI: 10.3897/BDJ.12.e121451