Amphinemura apicilobata, Li, Weihai, Wang, Ying & Yang, Ding, 2016

Li, Weihai, Wang, Ying & Yang, Ding, 2016, Two new species of Amphinemura (Plecoptera: Nemouridae) from the Gaoligong Mountains of Yunnan, China, Zootaxa 4200 (3), pp. 381-388 : 381-383

Amphinemura apicilobata sp. nov.

( Figs. 1 , 3 a, 4a–c)

Adult habitus ( Fig. 3 a). Head and appendages dark brown, compound eyes black. Thorax brown, pronotum subrectangular with obscure rugosities, corners obtuse; legs yellowish brown. Wing membranes subhyaline, veins brown to dark brown. Abdomen brown, terminalia darker.

Male: Forewing length 6.4–6.5 mm, hind wing length 5.4–5.5 mm. Tergum IX weakly sclerotized, anterior indentation broad but shallow; a row of strong bristles and many tiny spines located on paramedial part along posterior margin ( Figs. 1 a, 4a). Vesicle of sternum IX claviform, parallel-sided at most length, basal part with distinct lateral hairs ( Fig. 1 b). Hypoproct subquadrate basally, gradually narrowing toward nipple-like tip, with a triangular lateral notch before conjuction with posterior margin of sternum 9 ( Fig. 1 b). Tergum X sclerotized, a typical medial longitudinal concavity present beneath epiproct, covered by several scattered spinules along anterolateral portion of concavity ( Figs. 1 a, 4a). Cercus slightly sclerotized and gently curved inward ( Fig. 1 b). Epiproct ( Figs. 1 e, 4b–c) long and recurved; generally subquadrate, apical half slightly narrow but swollen after KOH treatment ( Figs. 4a, c ), apex rounded with an indented tip in dorsal view ( Figs. 1 a, e; 4b–c). Dorsal sclerite with two narrow, darkly sclerotized, X-shaped lateral bands in dorsal view; beyond medial portion extending and forming two triangular lateral membranous processes covering part of the bulging ridge of ventral sclerites in lateral view ( Fig. 1 d–f). Ventral sclerite with expanded triangular sclerotized area fringed with a row of thick ca. 7 spines subapically, then an erect ridge fused with dorsal sclerite ( Figs. 1 c, 1f). Paraproct divided into three lobes: outer lobe a curved sclerite with 7–8 long subapical spines before a swollen membranous apex, mostly adhering to median lobe, in lateral view the medial half is enlarged ventrad; median lobe distally fused with outer lobe, nearly parallel-sided, distal half up-curved and apex with a row of long, subapical and apical lateral spines; inner lobe sclerotized and with slightly bilobed apex, partly hidden by hypoproct, nearly as long as outer lobe ( Fig. 1 g).Female: unknown.

Type material. Holotype male ( CAU), CHINA: Yunnan Province, Baoshan City, Tengchong County, Gaoligong Mountains , Datang , Cizhu River , 2012. V.8, coll. Y. Liu . Paratype, 1 male ( HIST), the same locality and date as holotype .

Etymology. The specific name refers to the membranous apical lobe of paraproct.

Distribution. China (Yunnan Province).

Diagnosis and remarks. The new species seems related to a widespread Chinese species, A. curvispina ( Wu, 1973) known from Hunan, Fujian, Zhejiang and Guangxi, in sharing a similar epiproct in dorsal aspect. However, the distinct triangular ridge of the ventral sclerite of epiproct in lateral aspect readily distinguishes A. apicilobata from A. curvispina , in addition to the obviously different spinulation of the paraproctal median lobe. Amphinemura apicilobata also differs from other known species from Yunnan Province by the large membranous apex of paraprocts.

Figures

FIGURE 1. Amphinemura apicilobata sp. nov. (male): a. Terminalia, dorsal view. b. Terminalia, ventral view. c. Terminalia, lateral view. d. Terminalia, dorsolateral view. e. Epiproct, dorsal view. f. Epiproct, lateral view. g. Right paraproct, caudal view.

FIGURE 3. Male habitus, dorsal view. a. Amphinemura apicilobata sp. nov. b. Amphinemura bimaculata sp. nov.

FIGURE 4. a – c. Amphinemura apicilobata sp. nov. d – h. Amphinemura bimaculata sp. nov. a. Terminalia, dorsal view. b – c. Epiproct variations, dorsal view, fig. b is before potassium hydroxide treatment. d. Head and pronotum, dorsal view. e. Terminalia, dorsal view. f – h. Epiproct variations, dorsal view, fig. f is before potassium hydroxide treatment.