Perlomyia sinuata, Sivec & Stark, 2012

Sivec, Ignac & Stark, Bill P., 2012, Seven New Species Of Perlomyia (Plecoptera: Leuctridae) From Japan, Illiesia 8 (7), pp. 94-103 : 101-102

Perlomyia sinuata sp. n.

( Fig. 24-27 )

Material examined. Holotype ♂, Japan, Nara Prefecture, Takami River, Aritoshi , 15 April 1995, Y. Isobe ( PMSL) . Paratypes: 2♂, 2♀, same data ( PMSL). Male. Forewing length 8 mm. General color dark brown to black. Epiproct sinuate in lateral aspect ( Fig. 26 ). Tergum 9 strongly narrowed mesally ( Fig. 24 ). Tergum 10 without small knobs. Cerci somewhat globular in dorsal aspect, but bearing a small dorsobasal lobe in lateral aspect ( Fig. 26 ); terminal spine absent. Paraprocts fused into a broad, thick process, curved slightly dorsad and narrowly rounded apically ( Fig. 26 ). Sternum 9 apex slender ( Fig. 25 ), not reaching apex of paraprocts and curved only slightly dorsad. Vesicle body almost circular, attached to sternum 9 by a slender stalk ( Fig. 25 ).

Female. Forewing length 9 mm. Posterior margin of sternum 7 enlarged, sclerotized and strongly produced over base of sternum 8 as a narrowed projection ( Fig. 27 ). Sternum 8 with a short, wide median sclerite, narrowly divided, or notched by membrane; wing-like sclerites slightly longer than, and about as wide as median sclerites ( Fig. 27 ).

Larva. Unknown.

Etymology. The species name refers to the sinuate anterior margin of the epiproct in lateral aspect.

Diagnosis. Among the Japanese Perlomyia which lack knobs on male tergum 10, this species is the only one in which the epiproct has a sinuate profile.

Figures

Figs. 24-27. Perlomyia sinuata terminalia. 24. Male dorsal. 25. Male ventral. 26. Male lateral. 27. Female ventral.