Tibetisoperla elongata, Yan & Chen & Bozdoğan, 2022

Yan, Yan-Hua, Chen, Zhen-Ning, Bozdoğan, Hakan & Li, Wei-Hai, 2022, The species of Tibetisoperla (Plecoptera: Perlodidae), European Journal of Taxonomy 823, pp. 125-140 : 126-130

Tibetisoperla elongata sp. nov.

urn:lsid:zoobank.org:act:7B5313C1-F26C-41C5-88BD-7B0486372A08

Figs 1–4

Diagnosis

General color brownish. Vesicle developed and tongue-shaped, which is almost as long as its width. Aedeagus mostly membranous, except for a v-shaped ventrobasal sclerite, generally tubular and slightly curved ventrally at apex. Subgenital plate in female produced and subquadrate, posteriorly with a broad arcuate posteromedial notch.

Etymology

The specific epithet refers to the vesicle being long, which was presumed to be atypical for this genus.

Material examined

Holotype CHINA • ♂; Qinghai Province, Menyuan County, Daitong River ; 37°21′37.99″ N, 101°36′55.30″ E; alt. 2782 m; 30 Jun. 2021; Wei-Hai Li and Rong-Rong Shen leg.; HIST.

Paratypes CHINA • 1 ♂; same collection data as for holotype; HIST • 3 ♀♀; same collection data as for holotype; HIST • 1 ♂; same location as for holotype; 37°18′1.38″ N, 101°55′49.82″ E; alt. 2643 m; 26 Jul. 2021; Wei-Hai Li and Bin Zhang leg.; HIST .

Description

Male

ADULT HABITUS ( Figs 1A, 1C ). Forewing length 8.1–8.5 mm, hindwing length 7.0– 7.2 mm (N=3). Head brown with dark brown arween ocelli and tentorial callosities. M-line dark brown. Triocellate, anterior ocellus smaller. Antennae brownish, scape brown, palpi brownish. Pronotum disc with large area of brown to dark brown rugosities and pale medial stripe. Legs brownish. Wings hyaline, veins brown.

ABDOMEN ( Figs 1D , 2 ). Abdominal terga brownish and terga 1–4 darkly sclerotized. Terga 2–9 each with a pair of small dark spots medially and dark medial strip (obscure in young individual). Tergum 9 bearing two paramedial patches of sensilla on darker posterior margin, patches separated by pale T-shaped mesal membrane. Tergum 10 bilobate, distally upcurved with 3–4 thick apical setae. Vesicle located on posterior margin of sternum 8, generally tongue-shaped, ca almost as long as its width, basally brown but apex paler, covered with hairs. Paraprocts sclerotized, with partially separated apical sclerite covered by small terminal spines.

AEDEAGUS ( Fig. 3 ). Membranous except for a v-shaped ventrobasal sclerite, tubular and slightly curved ventrally at apex, mostly covered by fine spinules, dorsoapical and ventroapical portions bald.

Female

ADULT HABITUS ( Fig. 1B ). Forewing length 9.0– 9.9 mm, hindwing length 7.9–8.2 mm. Body coloration similar to male.

ABDOMEN ( Fig. 4 ). Tergum 10 unmodified. Subgenital plate sclerotized and subquadrate, produced posteriorly covering anterior half of sternum 9, with a broad arcuate posteromedial notch.

EGG. Unknown.

Distribution

China: Qinghai Province. Presently only known from two sites along the riverside of Daitong River in Menyuan County.

Remarks

The type species of Tibetisoperla , T. wangluyui Huo & Du, 2021 is a dark species and has a reduced vesicle on sternum 8, but the new species is a brownish species and has a developed vesicle which is present in typical Isoperla Banks, 1906 ( Teslenko & Zhiltzova 2009; Murányi 2011; Szczytko & Kondratieff 2015; Cao et al. 2020), another genus of Isoperlinae in China. However, the large apical setae of tergum 10 and spiny apical sclerite of paraproct clearly show its placement in Tibetisoperla .

The female of T. elongata is different to T. wangluyui in subgenital plate structure, the former is broadly semicircular while the latter is subquadrate. Additionally, T. elongata with a typically posterior notch which is indistinct of T. sclerotica . Terga 1–8 of female with black medial stripes and subgenital plate is broadly triangular in T. sclerotica .

Figures

Fig. 1. Tibetisoperla elongata sp. nov. A. ♂, holotype (HIST), habitus, dorsal view. B. ♀, paratype (HIST), habitus, dorsal view. C. ♂, holotype (HIST), head and pronotum, dorsal view. D. ♂, holotype (HIST), terga 3–9, dorsal view. Abbreviations: see Material and methods.

Fig. 2. Tibetisoperla elongata sp. nov., ♂, holotype (HIST). A. Terminalia, dorsal view. B. Terminalia, ventral view. C. Vesicle, ventral view. D. Vesicle, lateral view. E. Terminalia, lateral view. F. Tergum 10 and paraproct, dorsal view. G. Apex of tergum 10 and paraproct, lateral view (cercus removed). Abbreviations: see Material and methods.

Fig. 3. Tibetisoperla elongata sp. nov., ♂, holotype (HIST). A. Aedeagus, dorsal view. B. ♂, Aedeagus, ventral view. C. Aedeagus, lateral view. D. Basal half of aedeagus, detail of spinous area, dorsal view. E. Aedeagal apex, dorsal view. Abbreviations: see Material and methods.

Fig. 4. Tibetisoperla elongata sp. nov., ♀, paratype (HIST) A. Head and pronotum, dorsal view. B. Terminalia, dorsal view. C. Terminalia, ventral view. D. Subgenital plate, lateral view. E. Subgenital plate, ventral view. Abbreviations: see Material and methods.