Amphinemura kuankuoshui Li, Du & Yang

Li, Weihai, Du, Kaishu & Yang, Ding, 2017, Two new species of the nemourid genus Amphinemura (Plecoptera: Nemouridae) from China, Zootaxa 4254 (4), pp. 485-492 : 487-490

Amphinemura kuankuoshui Li, Du & Yang , sp. nov.

Figures 2 & 4 .

Diagnosis. The males of this new species are characterized by the lateral sclerite of epiproct forming elongate, triangular dorsoapical sclerite that ends subapically ( Fig. 2 c). Paraproctal median lobe in dorsal aspect has a clubshaped apex armed with a row of ca. 12–14 long and sharp lateroapical spines ( Fig. 2 a).

Adult habitus ( Figs. 4 a–b). Head black without distinctive pattern; eyes dark brown and ocelli pale; antennae brown, scape and pedicel darker; palpi brownish. Pronotum brown with obscure darker rugosities. Wings pale with brownish veins. Legs generally brown, tibiae lighter. Abdominal terga brown with dark brown terminalia.

Male ( Fig. 2 ). Forewing length ca. 5.9 mm, hindwing length ca. 4.9 mm. Terga I–VIII each with two slender dark sclerotized lateral bands at anterior margin. Tergum VIII with a median patch of several long hairs. Tergum IX sclerotized, anterior margin darkly sclerotized, with deep and broad anterior indentation; two paramedial groups of tiny spines and long hairs present along posterior margin ( Fig. 2 a). Vesicle of sternum IX claviform, basal portion slightly enlarged, remainder parallel-sided, tip rounded, ventral surface mostly membranous ( Fig. 2 b). Hypoproct basally rectangular, medially tapering and trapezoidal, apex up-curved and tubular, the lateral margins moderately sinuous ( Fig. 2 b). Tergum X sclerotized and mostly darkly pigmented, sparse spinules present at anterolateral margins of the typical medial concavity beneath epiproct. Cercus membranous, longer than wide. Epiproct ( Figs. 2 c, 2d) long and recurved, nearly subrectangular, ca. 2.5X longer than width, apex arcuate. Dorsal aspect mostly membranous, lateral sclerite forming elongate, triangular dorsoapical sclerite that ends subapically basally with typical U-shaped sclerite; apex with thin V-shaped sclerite medially extended from ventral sclerite ( Fig. 2 c); ventral sclerite forming slender triangular ridge subapically, its lower face bent backward and slightly S-shaped, forming rounded angle with median portion of dorsal sclerite, with a row of short stout teeth along the ventral surface ( Fig. 2 d). Paraproct trilobed ( Figs. 2 a, 2e): inner lobe sclerotized, generally triangular, apical portion slightly bilobed; median lobe heavily sclerotized except the apical spinose area, moderately slender at basal half, slightly enlarged from midlength, apical third in dorsal aspect club-shaped and armed with a row of ca. 12–14 long and sharp apicolateral spines and several smaller ventrolateral spines ( Figs. 2 a, 2b). Outer lobe heavily sclerotized, basally a curved triangular sclerite and sinuate till hook-like up-curved apex, with ca. 5–6 large downcast subapical spines and 2 stronger apical spines with opposite direction.

Female. Unknown.

Type material. Holotype male ( CAU), China: Guizhou Province, Zunyi City, Suiyang County, Kuankuoshui National Natural Reserve , Central Station , 2010. VI.5, Yan Li.

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

Distribution. China (Guizhou).

Remarks. The male of the new species appears similar to members of A. schmidi group sensu Aubert (1967) and is most similar to A. ludinganus Li & Yang, 2008b described from Sichuan Province of southwestern China, sharing a similar median paraproctal lobe. However, A. kuankuoshui can be easily separated from A. ludinganus by the epiproct having a wide apex and a slender triangular subapical sclerite of the lateral sclerite in dorsal view. In A. ludinganus the epiproctal apex is much narrower than basal portion and the lateral sclerite has asubquadrate subapical sclerite (fig. 28 in Li & Yang 2008b).

Figures

FIGURE 2. Amphinemura kuankuoshui sp. nov. (male). a. Terminalia, dorsal view. b. Terminalia, ventral view. c. Epiproct, dorsal view. d. Epiproct, lateral view. e. Right paraproct, caudal view.

FIGURE 4. Adult habitus of Amphinemura kuankuoshui. a. Dorsal view. b. Lateral view.