Perlomyia taiwanensis, Sivec & Stark, 2012

Sivec, Ignac & Stark, Bill P., 2012, The Genus Perlomyia Banks In Taiwan (Plecoptera: Leuctridae), Illiesia 8 (11), pp. 119-124 : 122-123

Perlomyia taiwanensis sp. n.

( Figs. 9-12 )

Material examined. Holotype ♂, paratypes 32♂, 25♀, Taiwan: Nantou County, W Songchuangkang , 2110 m, 24°13’24’’N, 121°18’55’’E, 21 March 1996, I. Sivec, B. Horvat, ( PMSL). Additional paratypes: Taiwan: Hualien County, Tayuling, 2440 m, 24°11’03’’N, 121°19’55’’E, 22 March 1996, I. Sivec, B. Horvat, 1♂ ( PMSL). Ilan County, Taipingshan, 2000 m, 24°29’27’’N, 121°32’10’’E, 10 April 1996, I. Sivec, B. Horvat, 3♀ ( PMSL). Nantou County, E Songchuangkang, 2570 m, 24°11’21’’N, 121°18’35’’E, 22 March 1996, I. Sivec, B. Horvat, 1♂ ( PMSL). Taichung County, Wulin, Sheipa National Park , 24°23’45’’N, 121°18’50’’E, 20 March 1996, I. Sivec, B. Horvat, 36♂, 44♀, 2 larvae ( PMSL), 10♂, 10♀ ( BPS); Wulin, Sheipa National Park , 1820 m, 24°21’23’’N, 121°18’55’’E, 20 March 1996, I. Sivec, B. Horvat, 6♂, 10♀ ( PMSL),

Adult habitus. General color dark brown to black, typical of genus.

Male. Forewing length 6 mm. Epiproct short, thick at the base and curved slightly in lateral aspect, and somewhat triangular in dorsal aspect ( Figs. 9, 11 ). Sclerite of tergum 9 broadly excavated posteromesally; tergum 10 with a small pair of round knobs located near mesolateral margins. Cerci bearing a wide, dorsally projecting, basal lobe with rounded distal margins and an apical spine ( Fig. 11 ). Paraprocts fused into a broad, thick process, upper margin scarcely curved. Apex of sternum 9 strongly narrowed apically and curved upward in lateral aspect. Vesicle truncate along posterior margin ( Fig. 10 ).

Female. Forewing length 6.5-7 mm. Posterior margin of sternum 7 relatively straight and only slightly produced. Sternum 8 with mesal sclerites narrowly divided by membrane ( Fig. 12 ); wing-like sclerites somewhat quadrangular in shape and attached along the entire lateral margins of mesal sclerites.

Larva. Undescribed.

Etymology. The species name is based on the type locality on the island of Taiwan.

Diagnosis. This species is the only one of the known Taiwanese species of Perlomyia in which males have knobs on tergum 10. This character is shared with both Nearctic species and with several from Asia, however, the epiproct shape will distinguish this species from all known members of the genus. Females are generally similar to others from Taiwan but differ in having the lateral wing-like sclerites of sternum 8 attached along the entire length of the mesal sclerites.

Figures

Figs. 9-12. Perlomyia taiwanensis. 9. Male abdominal terga 8-10. 10. Male abdominal sterna 9-10. 11. Male abdominal segments 9-10, lateral aspect. 12. Female abdominal sterna 7-10.