Amphinemura interrupta 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 : 61-63

Amphinemura interrupta Li &Yang , sp. nov.

( Figs. 1–5 )

Diagnosis. This species is characterized by the dorsal sclerite of the epiproct having two dark, sinuous, lateral arms that become nearly membranous apically, and a mid-anterior bar expanded into a rhombic apex, its ventral sclerite strongly sclerotized, expanded ventrally into a gently curved, keel-shaped ridge. Additionally, the median lobe of the paraproct is covered with many long hairs in its proximal half. The paraproct also has a heavy spine mediolaterally and several others in rows on the dorsal surface of the apex.

Male. Forewing length 4.6 mm, hindwing length 3.8 mm. Head and compound eyes dark brown; antennae and mouthparts brown, labial palpi yellowish brown. Thorax brown, pronotum trapezoidal with rounded corners; legs brownish. Wing membrane transparent, veins brownish. Abdomen grayish brown with hairs mostly pale.

Terminalia ( Figs. 1–5 ): Tergum 9 weakly sclerotized, with a large anterior emargination and a row of long hairs located paramedially at posterior margin. Sternum 9 with slender vesicle, slightly enlarged at base, distinctly sclerotized laterally; hypoproct broad basally, gradually tapering toward tip. Tergum 10 weakly sclerotized with mid-anterior sclerotized stripe, posterior margins mostly sclerotized, deep longitudinal area below epiproct with two groups of tiny spines along anterolateral margin. Cerci are slightly sclerotized and longer than wide. The epiproct is widest basally and extends to a narrowed, parallel-sided apex. The dorsal sclerites form dark, sinuous, lateral arms that become nearly membranous apically. The apex of the epiproct is bifurcate dorsally, forming two blunt tips. The ventral sclerite is strongly sclerotized, expanding ventrally into a gently curved, keel-shaped ridge with a row of short black spines. The paraprocts are divided into three lobes. The outer lobes are sclerotized, distinctly so apically, where the enlarged tip is fringed with a whorl of spines, lobe being slightly shorter than median lobe. The median lobe is mostly sclerotized and curved dorsally in its apical third, many long hairs cover the basal half of the lobe and a heavy, laterally directed median spine and several rows of finer spines adorn the apex. The inner lobe is slightly sclerotized with the medial margins almost straight, while the outer margins are sinuous, this lobe has an acute tip and is only half the length of the median lobe.

Female. Unknown.

Type Material. Holotype male (CAU), CHINA: Yunnan, Dulongjiang, 27o73'N, 98o35'E, 2100 m, 2007. V.20, Xingyue Liu.

Distribution. China (Yunnan).

Etymology. The specific epithet refers to the dorsal sclerite of the epiproct with two dark, sinuous, lateral arms distinctly weakened subapically, which look like a broken stripe; the Latin adjective “ interrupta ” means broken apart.

Remarks. The new species is closely related to A. dispositspina Du and Wang, 2007 from Yunnan in having a similar epiproct and paraproct. In Amphinemura interrupta , the dorsal arms of the epiproct are dark and sinuous, the arms appearing interrupted apically. The tip of the epiproct is rounded and the ventral sclerite is produced as a gently curved keel with a row of spines in lateral view. The median lobe of the paraproct bears a distinct spine medially and several rows of spines on the dorsal surface of the apex. In A. dispositspina , the dorsal sclerites of the epiproct form the nearly straight lateral arms that extend along the outer margin. The tip of the epiproct is triangular in lateral view and its ventral sclerite is expanded into a narrow ridge ventrally. The outer lobe of the paraproct bears a row of spines along the inner side of the apex and several long spines on the outer side (Du and Wang 2007).

Figures

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