Amphinemura ningxiana Li & Yang

Li, Weihai & Yang, Ding, 2011, Two new species of Amphinemura (Plecoptera: Nemouridae) from China, Zootaxa 2975, pp. 29-34 : 29-31

Amphinemura ningxiana Li & Yang , sp. nov.

( Figs. 1–5 )

Diagnosis. The adult males of this new species are characterized by the dorsal sclerite of epiproct with two darkly sclerotized lateral bands which extend apically forming two darkly sclerotized, finger-shaped lateral arms with tiny terminal spines and an adjacent subapical plate ventrolaterally; the ventral sclerite forms an erect, elongate, sharp ventral ridge ( Figs. 1–5 ).

Description. Forewing length 4.1–4.3 mm, hind wing length 3.0– 3.2 mm (n=3). Head and appendages dark brown, with compound eyes black and maxillary palpi pale brown. Thorax brown, pronotum subrectangular with cuticular rugosities, corners obtuse; legs brown. Wing membranes hyaline with veins dark brown. Abdomen yellowish brown; hairs on abdomen mostly pale.

Male terminalia ( Figs. 1–5 ): Tergum VIII with medially interrupted antecosta. Tergum IX weakly sclerotized, with broad triangular anterior and posterior indentations, row of tiny spines medially and several long bristles paramedially located along posterior margin. Sternum IX with claviform vesicle slightly swollen subapically; hypoproct somewhat subquadrate basally, gradually narrowing toward tip but abruptly tapering subapically. Tergum X weakly sclerotized except anterior and posteromedian margins mostly sclerotized, a large medial concavity present anterior to base of epiproct, many spinules located along anterolateral margins of concavity. Cercus slightly sclerotized, much longer than wide. Epiproct long and recurved, subquadrangular with apical portion expanded; dorsal sclerite heavily sclerotized, with two darkly sclerotized lateral bands which extend apically forming two darkly sclerotized, finger-shaped lateral arms with tiny terminal spines and an adjacent subapical plate ventrolaterally, which appears triangular in lateral view; ventral sclerite strongly sclerotized, ventrally expanded subapically, forming an erect, elongate, sharp ridge fringed with a row of tiny ventral spines. Paraproct divided into three lobes: outer lobe distinctly sclerotized, thin, with membranous apex bearing several dark apical spines, shorter than median lobe; median lobe sclerotized and distinctly curved upward subapically, with several long lateral spines at enlarged, partly membranous apex; inner lobe slightly sclerotized and triangular, shorter than median lobe.

Female: Unknown.

Type material. Holotype: male ( CAU), China: Ningxia Hui Autonomous Region, Jingyuan County, Longtan, 35.3893 N, 106.3432 E, 1880 m, 2008. VII.5, Jingxian Liu. Paratypes: 1 male ( CAU), same data as holotype, 1 male ( HIST), malaise trap, China: Ningxia Hui Autonomous Region, Mt. Liupanshan, 2005.VI–IX, Maoling Sheng.

Etymology. The species is named after the type locality, Ningxia.

Distribution. China (Ningxia).

Remarks. A pair of similar apical processes on the epiproct is also found in A. didyma Zhu and Yang, 2002 from Ningxia and A. pterygoidea Li and Yang, 2008a from Tibet, but the new species has an erect, elongate, sharp ventral ridge of the epiproct ( Fig. 4 ). In A. didyma , the corresponding ridge is obtuse and short in lateral view and A. pterygoidea has the ventral ridge short and triangular in lateral view ( Zhu and Yang 2002: Fig. 7 ; Li and Yang 2008a: Fig. 14).

Figures

FIGURES 1 – 5. Amphinemura ningxiana Li & Yang, sp. nov. (male). 1. Terminalia, dorsal view. 2. Terminalia, ventral view. 3. Epiproct, dorsal view. 4. Epiproct, lateral view. 5. Right paraproct, caudal view.

FIGURES 6 – 10. Amphinemura tianmushana Li & Yang, sp. nov. (male). 6. Terminalia, dorsal view. 7. Terminalia, ventral view. 8. Epiproct, dorsal view. 9. Epiproct, lateral view. 10. Right paraproct, caudal view.