Illiesonemoura bituberculata Wang & Du, 2023

Wang, Zhi-Jie, Du, Yu-Zhou & Ji, Xiao-Yu, 2023, Three new species of Illiesonemoura Baumann, 1975 (Plecoptera, Nemouridae) from China, Biodiversity Data Journal 11, pp. 112020-112020 : 112020

Illiesonemoura bituberculata Wang & Du sp. nov.

Materials

Type status: Holotype. Occurrence : recordedBy: Yu-zhou Du ; individualID: Insect collection of Yangzhou University (ICYZU), Jiangsu Province, China; individualCount: 1; sex: male; lifeStage: adult; occurrenceStatus: present; occurrenceID: 82D320BE-8137-54E6-B600-64B17A0A86DE; Taxon : kingdom: Animalia ; phylum: Arthropoda ; class: Insecta ; order: Plecoptera ; family: Nemouridae ; genus: Illiesonemoura ; specificEpithet: bituberculata; Location : continent: Asia ; country: China; countryCode: CN; stateProvince: Sichuan; locality: 15 km west of Kangding, Zheduo River ; minimumElevationInMeters: 2920; verbatimLatitude: 29.994447N; verbatimLongitude: 101.892415; Identification: identifiedBy: Zhi-jie Wang, Yu-zhou Du & Xiao-yu Ji; Event: year: 1996; month: 6; day: 8; Record Level: language: en Type status: Paratype. Occurrence : recordedBy: Yu-zhou Du ; individualID: Insect collection of Yangzhou University (ICYZU), Jiangsu Province, China; individualCount: 1; sex: male; lifeStage: adult; occurrenceStatus: present; occurrenceID: 7053928D-FDFD-51B3-AF16-C74A29F497D6; Taxon : kingdom: Animalia ; phylum: Arthropoda ; class: Insecta ; order: Plecoptera ; family: Nemouridae ; genus: Illiesonemoura ; specificEpithet: bituberculata; Location : continent: Asia ; country: China; countryCode: CN; stateProvince: Sichuan; locality: 15 km west of Kangding, Zheduo River ; minimumElevationInMeters: 2920; verbatimLatitude: 29.994447N; verbatimLongitude: 101.892415; Identification: identifiedBy: Zhi-jie Wang, Yu-zhou Du & Xiao-yu Ji; Event: year: 1996; month: 6; day: 8; Record Level: language: en

Description

Male. Head brown, antennae slightly brown (Fig. 2 ); pronotum paler than head, anterior margin wider than posterior margin. A single unbranched cervical gill as typical of the genus present on each side of mid-line (Fig. 1 A). Wings subhyaline, fumose, veins brown. Forewing length ca. 6 mm, hind wing 5.5 mm. Legs brown (Fig. 2 ). Tergum 9 slightly sclerotised, extending posteriorly as a broad lobe over tergum 10. Tergum 10 slightly sclerotised anteriorly, but being more sclerotised along the posterior margin where a pair of lateral knobs and a pair of strong median prongs are present, both most noticeable in dorsal view, a field of 5-6 tiny spines present anteromedially (Fig. 1 B). Hypoproct broad basally and tapering to a small, narrow tip, vesicle plump, length 2x width (Fig. 3 B). Cerci mostly membranous, long thin and bent inwards (Fig. 1 B, Fig. 3 A-C). Paraprocts divided into two lobes; inner lobe slightly sclerotised, thin and long; outer lobe broad basally, large triangular, outer part curving dorsally, with outer margin darkly sclerotised and with outward directed sclerotised prong from outer margin near cerci (Fig. 3 B and D). Epiproct short and broad in dorsal aspect; dorsal face with a pair of sclerotised bands each side of mid-line and distal margin of dorsal sclerite darkly sclerotised, extending anterolaterally, enveloping tip of ventral sclerite, which is more distinct in lateral and ventral views; basal sclerite membranous; ventral sclerite strongly sclerotised, broad basally and with lateral knobs at basolateral corners, becoming narrower towards apex, forming a pair of ridges each side of mid-line, each bearing a row of spines on anterior half (Fig. 3 E-G).

Diagnosis

The male of this species is characterised by two pairs of small knobs arising posteromedially from tergum 10. They are similar to I. tuberostyla ( Wu 1962) in the lateral view of the epiproct, both looking like tumours, but can be separated from the latter by the knobs protruding from the posterior margin of tergum 10. In I. tuberostyla , there was no mention of knobs on the terga.

Etymology

The name refers to the pair of knobs and strong prongs located posteromedially on tergum 10. The Latin adjective " tuberculata " means having knobs.

Distribution

China: Sichuan Province.

Figures

Figure 1. Male of Illiesonemoura bituberculata sp. nov. A cervical region in ventral view; B terminalia in lateral view.

Figure 2. Male of Illiesonemoura bituberculata sp. nov. Adult, dorsal view.

Figure 3. Male of Illiesonemoura bituberculata sp. nov. A terminalia in dorsal view; B terminalia in ventral view; C terminalia in lateral view; D paraproct (left) in ventral view; E epiproct in dorsal view; F epiproct in ventral view; G epiproct in lateral view. Abbreviations: T 9, T 10: Tergum 9, 10; ce: cercus; S 9, S 10: Sternum 9, 10; hp: hypoproct; v: vesicle; il: inner lobe of paraproct; ol: outer lobe of paraproct.