Borisnia kondratieffi, Chen, 2023

Chen, Zhi-Teng, 2023, Borisnia, a new genus ofCapniidae (Insecta: Plecoptera) from China, Faunitaxys 11 (68), pp. 1-5 : 1-2

Borisnia kondratieffi gen. et sp. nov.

( Fig. 1-10)

ZooBank: http://zoobank.org/ AA34265E-40C1-41D2-BED8-2C7024044437

Holotype, ♂ (ICJUST), unnamed stream near Medog Highway , Bome County, Tibet , China, 29 ° 46 ′27.48″N, 95°42′6.48″E, 3768m, 8.VII.2023, Zhi- TengChenleg .

Diagnosis. – As for the genus.

Reviewer:

Ji-Shen Wang (Dali University, Dali, Yunnan, China) - Orcid: https://orcid.org/0000-0002-0315-7500 - ZooBank: https://zoobank.org/ 0C4FE92F-97C9-427C-B5F4-762A93A837EC

Description (based on male holotype)

Dimension. – Body length ca. 9 mm.

Shape and coloration. – Body slender, generally dark brown.

Head. – Head rounded and completely dark brown. Antennae slender, ca. 13 mm.

Thoracic terga. – Apterous. Pronotum near as wide ashead, subquadrate, anterior corners obliquely truncate; anterior and median sutures distinct. Meso- and meta- nota slightly wider than pronotum.

Ventralscleritesof thorax. – Prothorax: presternum elliptical, unfused with the sub-trapezoidal basisternum; precoxal bridge kidney-shaped, fused with basisternum; furcasternum elliptical, fused with both basisternum and the widened, stripe-like postcoxal bridge; postfurcasternum large, fusiform, undivided, anteriorly almost touching but unfused with furcasternum. Mesothorax: spinasternum narrow, fused medially, not fused with prothoracic postfurcasternum but fused laterally with the large basisternum; presternum fusiform, slightly smaller than prothoracic postfurcasternum, fused with basisternum; furcasternum subtriangular, completely fused with basisternum, furcasternal arms, furcasternal pit, and the two lateral, subtriangular parts of postfurcasternum; katepisternum subdivided from basisternum, connected with the ventrally elongated trochantin. Metathorax: presternum fusiform, posteromedially fused with basisternum; spinasterum undeveloped; furcasternum elongated and fused with basisternum, abruptly projecting backwards but not fused with abdominal sternum 1; katepisternum subdivided from basisterum but connected with the ventrally elongated trochantin.

Legs. – Legs strongly elongated; length ranged from 6.5 mm in forelegs to 9.5 mm in hind legs.

Abdomen. – Abdominal terga and sterna 1–8 unmodified, without obvious patches of spines or sensilla basiconica. Posteromedial margin of tergum 9 transformed into a pair of finger-shaped projections; the two projections curved inward apically, with a deep, membranous median incision. Tergum 10 cleft. Basal sclerite much wider than long, near fusiform, slightly constricted medially. Epiproct divided into two lobes from base until fused near apex; eversible crest lacking; main epiproct sclerite comprised of two pairs of thin sclerites, each pair with a longer ventrolateral and a shorter dorsolateral sclerites; inner sclerite pale, rugose, and covered with dense setae. Subgenital plate semielliptical, lateral and posterior margins with three small cambered sclerites; ventral vesicle absent. Fusion plate finger-shaped, partially hidden under the paraprocts; retractoral plate small and slender, with sharp apex. Paraprocts darkly sclerotized; each paraproct kidney-shaped, together resembling a butterfly spreading its wings. Cercus slender, length ca. 11.5 mm, with long apical bristles, distal portion of each segment enlarged; left and right cercus each with 33 and 26 segments, respectively.

Female and larva. – Unknown.