Amphinemura oxyacantha Du & Zhao, 2021

Zhao, Meng-Yuan & Du, Yu-Zhou, 2021, A new species and new synonym of Amphinemura (Plecoptera: Nemouridae) from Zhejiang province of China, Journal of Natural History 55 (11 - 12), pp. 699-711 : 706-710

publication ID	https://doi.org/ 10.1080/00222933.2021.1921298
persistent identifier	https://treatment.plazi.org/id/B33E879A-155D-FF99-5613-1A87FE41FC3F
treatment provided by	Plazi
scientific name	Amphinemura oxyacantha Du & Zhao
status	sp. nov.

Treatment

Amphinemura oxyacantha Du & Zhao View in CoL , sp. nov.

( Figures 7 – 11 View Figure 7 View Figure 8 View Figure 9 View Figure 10 View Figure 11 )

Type material

Holotype, 1♂, China, Zhejiang province, Gate of Tianmu Mountain , 300 m, 30°31.948′N, 119°45.481′E (precision = 1000 m), 2006-III-19, leg. Wang Zhi-Jie & Sun Yun ( ICYZU). GoogleMaps

Paratypes, 26♂♂, 34♀♀, China, Zhejiang province, Gate of Tianmu Mountain , 300 m, 2006-III-20, leg . Wang Zhi-Jie & Sun Yun ( ICYZU); 1♂, China, Zhejiang province, Longwang Mountain , 2006-III-16, leg . Wang Zhi-Jie ( ICYZU) .

Description

Adult habitus ( Figure 7 View Figure 7 ). Head and antennae brown, pronotum subquadrate, brownish, with brown patches on the surface and a pale bar at the posterior end. Wings subhyaline, slightly brown, veins brown. Legs pale brown.

Male ( Figures 8 View Figure 8 , 11 View Figure 11 ). Forewing length 6.4–6.7 mm, hind wing length 5.3–5.7 mm. Tergum 9 slightly concave medially and lightly sclerotised, low lobes lateral of concavity bearing several small spines and a row of long hairs along the posterior margin. Tergum 10 with a rounded sclerous concavity below epiproct and a subtriangular spot anterior to concavity, lateral edges of concavity bearing a row of spines. Hypoproct broad basally and tapering to a blunt rounded tip, with some long hairs at apex, vesicle slender, 3 to 4X width. Epiproct with a pair of darkly sclerotised bars anteriorly in dorsal aspect, dorsal sclerite mostly membranous, a pair of darkly sclerotised bars protruding from apex, the two bars curved outward, respectively; lateral arms darkly sclerotised, short, extending to ventral surface at midpoint, and with an acute tip reaching over base of the sclerotised bars, which is more distinct in lateral view; ventral sclerite forming a half ball-shaped keel, bearing several tiny spines on the bottom, tip of the keel curved to a small angle and not reaching over dorsal sclerite. Paraproct divided into 3 lobes; inner lobe simple, small oblong, slightly sclerotised; median lobe slightly sclerotised, broad basally, thin at midpoint, bearing several long, strong, black prongs on the membranous, bulgy rounded apex, 2 to 4 other long prongs located on the membranous ventral surface; outer lobe darkly sclerotised, broad basally with a small lobe laterally, slightly curved from half and partially overlapping, bearing 4 denticles at apex. Cercus stout with a small bulge at the apex.

Female ( Figures 9–11 View Figure 9 View Figure 10 View Figure 11 ). Forewing length 8.9 mm, hind wing 8.1 mm. Head, pronotum and prothorax similar to male. Sternum 7 posteriorly produced in broad and slightly sclerotised pregenital plate. Subgenital plate wide and sclerotised slightly bilobed with small incision in the middle, and with a small notch at posterior margin of each lobe.

Nymph

Unknown.

Etymology

The name refers to the lateral arm with an acute tip. The Latin ‘ oxyacantha ’ meaning acute prong.

Remarks

The new species is similar to A. albicauda Li, Mo, Dong, Yang & Murányi, 2018 with two horn-shaped lateral processes of the dorsal sclerite, and a pointed ventral sclerite of the male epiproct, which is defined as the sinensis species group ( Li et al. 2018). However, the pale bar at the posterior end of pronotum is completely absent in A. albicauda . The male of new taxa may be separated from A. albicauda by the distinct broad base and median sclerotisation of epiproct. The paraprocts of the two species are extraordinary similar to each other with delicate difference, such as the number and arrangement of the spines on the median lobe. The outer lobe is broad basally with a small lobe laterally in A. oxyacantha , but A. albicauda formed a thin and slender outer lobe. Additionally, the female of A. oxyacantha was collected when mated with the male and the characteristics of female terminalia are significantly different from A. albicauda . From the perspective of geographical distribution, A. oxyacantha is widely distributed in Tianmu Mountain and Longwang Mountain in Zhejiang province of eastern China, which is over 1000 km far away from Qinling Mountain in Shaanxi province of northern-central China, the type locality of A. albicauda .