Indonemoura trispina Li and Sivec

Li, Weihai, Yang, Ding & Sivec, Ignac, 2005, Two new species of Indonemoura (Plecoptera: Nemouridae) from China, Zootaxa 893, pp. 1-5 : 3-4

Indonemoura trispina Li and Sivec , sp. nov.

(Figs. 7–11)

Diagnosis. Epiproct with weak apical indentation, and with ventral sclerite strongly sclerotized, expanded ventrally into a ridge with several spines. Outer lobe of paraproct bulbous at base and forming a heavily sclerotized blade at its tip; median lobe with two more slender lobes.

Adult. Male body length 5.5 mm; forewing length 7.5 mm, hindwing length 6.0 mm. Head, antennae, and mouthparts dark brown. Thorax dark brown; pronotum yellowish brown with margins dark brown. Wings hyaline. Legs brown. Abdomen yellow; hypopygium including cerci yellowish brown; hairs on abdomen mostly pale.

Terminalia (Figs. 7–11): Tergum 9 weakly sclerotized, slightly constricted medially, with a shallow triangular mid­anterior indentation. Sternum 9 with slender vesicle; hypoproct wide basally, then distinctly tapering toward tip with three terminal spines. Tergum 10 weakly sclerotized except posterior margin strongly sclerotized, with a quadrangular membranous patch, and with two groups of several tiny black spines medially. Cercus slightly sclerotized, nearly cylindrical, notched at base. Epiproct slightly constricted at middle, with weak apical incision, with ventral sclerite strongly sclerotized, expanded ventrally into a ridge bearing several spines. Paraproct divided into three lobes widely fused basally: outer lobe bulbous at base and forming a heavily sclerotized blade at its tip; median lobe with two more slender lobes; inner lobe narrow and heavily sclerotized.

Female. Unknown.

Type Material. Holotype male (preserved in 75% alcohol), Guangdong, Ruyuan, Nanling National Natural Reserve, 2003. III. 25, Ding Yang. Type deposited in the Entomological Museum of China Agricultural University, Beijing.

Etymology. The specific name refers to the three terminal spines of the hypoproct.

Remarks. The new species is somewhat similar to I. hubeiensis Yang and Yang, 1991 in having the pointed inner lobe of the paraproct and expanded ridge of the ventral sclerite of the epiproct, but may be separated from the latter by the shape of the outer lobe and ventral ridge. In I. hubeiensis , the outer lobe is terminated into three sharp prongs and the enlarged ridge of the ventral sclerite is semicircular.