Amphinemura triramia ( Wu, 1962 )

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 : 65-66

Amphinemura triramia ( Wu, 1962)

( Figs. 13–17 )

Nemoura triramia Wu, 1962: 142 . Type locality: Xinujianghegu, Yunnan. Amphinemura triramia ( Wu, 1962) . Baumann, 1975: 12.

Diagnosis. This species is characterized by an epiproct that is divided into a pair of bilobed lateral processes, each with two apical denticles, and a vase-like median process in dorsal view. The outer lobe of the paraproct is incurved medially and then upcurved apically, terminating in a pointed tip, while the median lobe is strongly curved dorsomedially with an enlarged apex bearing a stout black spine and several long black spines.

Male. Head, antennae and mouthparts dark brown; compound eyes dark. Thorax brown, pronotum much narrower than head, with slight rugosities, angles obtuse. Wings hyaline; legs brownish. Abdomen brown with pale hairs.

Terminalia ( Figs. 13–17 ): Tergum 9 weakly sclerotized except anterior band darkly sclerotized, with wide anterior and shallow posterior incision; posterior margin with tiny spines and long hairs at middle. Sternum 9 with vesicle slightly enlarged at base, where it is sclerotized bearing two spine-like, straight strips backward directed; hypoproct wide basally, nearly quadrangular, and gradually tapering posteromedially toward tubular tip. Tergum 10 weakly sclerotized except anterior and posterolateral margins darkly sclerotized; a large midanterior concavity present with tiny, black spines sublaterally. Cercus slightly sclerotized, longer than wide. Epiproct divided into a pair of apically incurved lateral processes, each of which is bilobed with two apical denticles, and a vase-like median process extended from its ventral sclerite that is strongly upcurved and then slightly curved backward apically, and bears an angulate sub-apical ridge without ventral spines. Paraproct: outer lobes distinctly sclerotized, curved medially and then upcurved apically, terminating into a pointed tip. Median lobe sclerotized, with a dark slender strip along outer margin, strongly curved dorsomedially, bearing a stout black spine and several long black spines on an enlarged apex. Inner lobe triangular, slightly sclerotized, much shorter than median lobe.

Material examined. 1 male (holotype, IZCAS), CHINA: Yunnan, Xinujianghegu?, 800 m, 1955. V.11. 10 males ( CAU), CHINA: Yunnan, Jinping, Dazhai, 23o03'N, 102o93'E, 800 m, 2006. V.17, Junhua Zhang. 1 male ( CAU), Yunnan, Jinping Protection Station, 22o77'N, 103o24'E, 800 m, 2007. V.18, Junhua Zhang.

Distribution. China (Yunnan).

Remarks. The holotype of this species is damaged, but the epiproct is still in good condition for specific identification. In Wu’s figures, the trilobed paraproct is difficult to discern possibly due to the inadequate treatment of the heavy sclerotization of the specimen ( Wu 1962).

Figures

FIGURES 13 – 17. Amphinemura triramia (Wu, 1962) (male). 13. Terminalia, dorsal view. 14. Terminalia, ventral view. 15. Epiproct, dorsal view. 16. Epiproct, lateral view. 17. Right paraproct, caudal view.