Perlomyia

Murányi, Dávid, Jeon, Mi Jeong, Hwang, Jeong Mi & Seo, Hong Yul, 2014, Korean species of the genus Perlomyia Banks, 1906 (Plecoptera: Leuctridae), Zootaxa 3881 (2), pp. 145-154 : 150-151

Perlomyia sp. Ko1

( Figs. 25–27 , 33 )

Rhopalopsole mahunkai Zwick, 1973 — Zwick 1973a: 163. (a female was assigned as a paratype of P. mahunkai ).

Literature data. Zwick 1973a, under Rhopalopsole mahunkai : ( North Korea), Bagyon san, San-chon-tong, about 20 km SE from Kaesong (North Hwanghae Province, Mt. Bakyon, San-chon tong, N38°05’ E126°35’), 0 8.06.1970 (loc. Korea.112), leg. Sándor Mahunka, Henrik Steinmann: 1♀ (HNHM).

New material. North Korea, Kangwon Province, Kosŏng-gun, Kumgang Mts., swept along footpath from Kumgang-mun Gate to Kuryong Falls, N38°40’ E128°10’, 27.05.1985 (loc. Korea 951), leg. András Vojnits, Lajos Zombori: 2♀; North Korea, Kangwon Province, Kosŏng-gun, Kumgang Mts., swept in forest at Kwinyon-am Rock, N38°40’ E128°15’, 28.05.1985 (loc. Korea.956), leg. András Vojnits, Lajos Zombori: 2♀.

Diagnosis. Female: Sternum VII rectangular, with a small hemispherical membranous area posteriomedially, not fused to sternum VIII. Median sclerites on sternum VIII are with dark brown inner keel; remainder of the sclerites light brown, shorter than the keel, the sclerites are much wider than long. Additionally, two pairs of sclerites are present at the lateral edges of median sclerites and at the posterolateral edge of the segment.

Description. Medium sized species, macropterous. Forewing length: females: 5.5–6.0 mm. Head dark brown with distinct rugosities; antennae brown, palpi pale. Pronotum paler than head, one and half times longer than wide, much narrow than head; rugosities distinct. Meso- and metanotum brown, with longitudinally arranged dark brown patches; meso- and metathoracic basisterna with a pair of longitudinal dark stripes. Legs uniformly brown; wings hyaline, venation light brown. Pilosity generally short.

Female abdomen: Terga I–IX membranous, but with transverse row of four pigmented spots. Tergum X fully sclerotized. Sterna I–VI simple. Sternum VII rectangular, with a small, hemispherical membranous area posteriomedially; not fused to sternum VIII. A thin, horseshoe-shaped spermathecal sclerite is visible after KOHtreatment. Median sclerites on sternum VIII are with dark brown inner keel, that are longer than half of the segment’s length; their surface is wrinkled. Rest of the sclerites are light brown and bald, with inner halves shorter than the keel, the outer, partly separated halves are narrowing laterally; the sclerites are much wider than long. Longitudinally elongated dark patches are joined to the lateral edges of the median sclerites, further pair of rounded, dark sclerites are positioned on the posteriolateral edge of the segment; all these dark areas are setose, contrary to the median sclerites. The segment is membranous and bald posterio-medially. Sternum IX simple, sternum X medially connected. Paraproct and cercus simple.

Distribution and ecology. This species was collected in the central portion of the Korean Peninsula at the end of May and early June ( Fig. 33 ). Sympatric species were P. kiritshenkoi , P. mahunkai , P. smithae , Sweltsa colorata Zhiltzova & Levanidova, 1978 , females of a Nemoura and an Alloperla species at the Kumgang Mountains locality ( Korea.956). It was found together with S. colorata at the other Kumgang Mountains locality ( Korea.951), and as a single specimen at the Mt. Bakyon locality ( Korea.112).

Affinities. This species is very similar to P. martynovi , known also only from females, but can be distinguished on the basis of the median sclerites, in Perlomyia Ko 1 the inner keels are longer than remainder of the sclerites, whereas the keels are slightly shorter in P. martynovi ; in Perlomyia Ko 1, the remainder of the sclerites are wider and lighter; darker brown and narrower in P. martynovi . The presence of inner keels on median sclerites distinguishes it from the other known Perlomyia females. However, this species is not named because of possible being conspecific with one of the four Japanese species that are known only from males (P. a i nu Sivec & Stark, 2012a, P. gifuensis ( Kohno, 1965) , P. kappa Sivec & Stark, 2012a and P. parva (Kawai, 1967)) .

Figures

FIGURES 25 – 30. Unassociated females of Perlomyia Banks, 1906 from Korea: 25 – 27: Perlomyia sp. Ko 1; 28 – 30: Perlomyia sp. Ko 2 — 25, 28: terminalia, ventral view; 26, 29: sterna 7 – 8, ventral view; 27, 30: sterna 7 – 8, lateral view—scale 1 mm.

FIGURES 31 – 33. Distribution of Asian Perlomyia Banks, 1906 species — 31: known occurrences in Asia; 32 – 33: know occurrences in North and South Korea—symbols on Fig. 32: open circle: P. secunda; full circle: P. mahunkai; circle with central dot: P. mar tynov i. symbols on Fig. 33: open circle: P. kiritshenkoi, P. smithae, P. Ko 1 and P. K o 2; full circle: P. levanidovae; circle with central dot: P. Ko 1.