Amphinemura nigritubulata Li & Yang

Li, Weihai & Yang, Ding, 2008, Two new species of Amphinemura (Plecoptera: Nemouridae) from Yunnan, China, with the redescription of A. triramia (Wu, 1962), Zootaxa 1926, pp. 61-67 : 63-65

Amphinemura nigritubulata Li & Yang , sp. nov.

( Figs. 6–12 )

Diagnosis. This species is characterized by a nearly crescent-shaped epiproct that is composed of a darkly sclerotized median process that extends from its ventral sclerite and a dorsal sclerite that forms a pair of longer, nearly parallel, lateral processes. Additionally, the outer lobe of the paraproct is distinctly sclerotized, strongly incurved medially, with the dark ball-shaped tip.

Male. Forewing length 5.1 mm, hindwing length 4.1 mm. Head, compound eyes, antennae and legs dark; mouthparts brown, labial palpi yellowish brown. Thorax brown, pronotum trapezoidal, with a dark mid-anterior bar, brownish middle patch and two dark kidney-shaped lateral patches. Wings subhyaline, veins dark. Abdomen brown and cerci yellowish brown; hairs on abdomen mostly pale brown.

Terminalia ( Figs. 6–12 ): Tergum 9 weakly sclerotized, except anterior margin heavily sclerotized, with a large triangular anterior indentation and a row of long hairs and two groups of tiny spines posteriorly. Sternum 9 with slender vesicle, slightly longer than half of hypoproct; hypoproct basally rectangular, gradually tapering subapically, with darkly sclerotized tip. Tergum 10 weakly sclerotized except anterior and posterior margins more heavily sclerotized, a longitudinal concavity present below epiproct, bearing two groups of tiny spines at mid-lateral margin. Cercus slightly sclerotized, longer than wide and slightly curved medially. Epiproct nearly crescent-shaped basally with many long hairs, then divided into a darkly sclerotized median process extended from the ventral sclerite and a pair of longer, nearly parallel, lateral processes of the dorsal sclerite; ventral sclerite strongly sclerotized, expanded ventrally into a distinct triangular ridge with many black spines, strongly curved upward in lateral view, with four teeth atop in dorsal view. Paraproct with a dark strip along basal margin, divided into three lobes. Outer lobe distinctly sclerotized, strongly incurved medially, with dark ball-shaped tip, shorter than median lobe. Median lobe slighly sclerotized basally, heavily sclerotized and curved upward subapically, bearing a foot-like apex with several rows of spines dorsally. Inner lobe slightly sclerotized, with triangular tip, much shorter than median lobe.

Female. Unknown.

Type Material. Holotype male (CAU), CHINA: Yunnan, Jinping, Fenshuiling Protection Station, 24o23'N, 103o04'E, 2006. V.18, Junhua Zhang.

Distribution. China (Yunnan).

Etymology. The epithet of this species refers to the darkly sclerotized, tubular apex of the hypoproct; the Latin “nigr” meaning dark and “ tubulata ” meaning tubular.

Remarks. A distinct trifurcate epiproct is also found in a group of species including A. ancistroidea Li & Yang, 2007 from Guangdong, A. cestroidea Li & Yang, 2005 from Sichuan, A. chui ( Wu, 1935) and A. elongata Li, Yang & Sivec, 2005 from Zhejiang, A. fleurdelia ( Wu, 1949) from Fujian and Guangdong, A. guangdongensis Yang, Li & Zhu, 2004 from Guangdong, A. leigong Wang and Du, 2006 from Guizhou, A. nanlingensis Yang, Li & Sivec, 2005 from Guangdong, A. sinensis ( Wu, 1926) from Jiangsu and A. triramia ( Wu, 1962) from Yunnan. The new species seems closely related to A. cestroidea Li & Yang, 2005 in having a similar epiproct and paraproct, but may be separated from A. cestroidea by the shape of the outer lobe of the paraproct and the basal portion of the epiproct. In A. cestroidea , the epiproct is distinguished by a hatchetshaped base, and the outer lobe of the paraproct has an apical spine (Li and Yang 2005).

Figures

FIGURES 6 – 12. Amphinemura nigritubulata sp. nov. (male). 6. Terminalia, dorsal view. 7. Terminalia, ventral view. 8. Epiproct, dorsal view. 9. Epiproct, lateral view. 10. Right paraproct, caudal view. 11. Pronotum, dorsal view. 12. Tip of hypoproct, ventrolateral view.