Perlomyia koreana, Murányi & Hwang, 2017

Murányi, Dávid & Hwang, Jeong Mi, 2017, Four new species and further contributions to the Leuctridae (Plecoptera) of the Korean Peninsula, Zootaxa 4282 (1), pp. 43-61 : 51-53

Perlomyia koreana sp. n.

( Figs. 16–18 )

Rhopalopsole mahunkai Zwick, 1973 — Zwick 1973a: 163. (a female was assigned as a paratype of P. mahunkai ). Perlomyia sp. Ko1— Murányi et al. 2014: 150. (formal description of the female).

Type material. Holotype male: SOUTH KOREA: GB, Cheongdo-gun , Unmun-myeon , Munsuseonwon, Unmunsan (Mt.), N: 35°38'32" E: 128°57'50", 8–30.iv.2016, leg. J.W.Lee ( KUEM) . Paratypes: GB, Cheongdogun , Unmun-myeon , Munsuseonwon, Unmunsan (Mt.), N: 35°38'32" E: 128°57'50", 8–30.iv.2016, leg. J.W.Lee: 1♂ 7♀ ( KUEM) . GG, Gapyeong-gun , Jeongmok-ri, Garimgyo (Br.), N: 37°58'36.4" E: 127°26'35.5", 4–11.v.2013, leg. Y.J. Bae: 5♀ ( KUEM) . GW, Inje-gun , Girin-myeon , Bangdong-ri, Bangtaecheon (St.), 18.v.1996, leg. Y.J. Bae: 2♀ ( KUEM) . GW, Hoengseong-gun , Anheung-myeon , Anheung-ri, Sancheongyo (Br.), 19.v.2010, leg. S.W. Jung: 2♀ ( KUEM) .

Diagnosis. Male: Tergum IX with a posteromedial lobe, tergum X without knobs or spines. Epiproct with wide and undivided base, apical half abruptly bent backwards and with acute, evenly tapering straight tip. Cercus short and rounded. Female: Sternum VII rectangular, with a small hemispherical membranous area posteromedially, not fused to sternum VIII. Median sclerites on sternum VIII have a dark brown inner keel; remainder of the sclerites light brown, shorter than the keel, the sclerites are much wider than long. Two pairs of sclerites are present at the lateral edges of median sclerites and at the posterolateral edge of the segment.

Description. Small sized species, macropterous. Forewing length: holotype 5.2 mm, male paratype 4.6 mm, female paratypes 6.4–6.8 mm; body length: holotype 5.2 mm, male paratype 5.0 mm, female paratypes 6.5–6.8 mm. Head dark brown with distinct rugosities; antennae brown, palpi pale brown. Pronotum paler than head, one and half times longer than wide, much narrower 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 brown. Setation generally short.

Male abdomen ( Figs. 16–18 ): Antecosta entire on terga I–IX but thin on terga III–V, terga I–II with a median membranous field. Tergum IX with moderately curved antecosta, posteromedial portion bears a short but distinct lobe. Integument between terga IX–X with dense anterior field of setae and small, not fully divided posterior field of very short setae. Tergum X lacks knobs or spines, antecosta of the hemiterga evenly bent, posteromedial paired sclerites large. Epiproct with wide, undivided base; the apical half is abruptly bent backwards, bears a large, membranous caudal callus with setae, the tip is acute, evenly tapering and straight. Paraprocts fused into a moderately wide, long lobe that is lightly sclerotized in its tip. Cercus short and rounded, bears a small basodorsal lobe, apical wart small but distinct. Sterna I–VIII simple, Sternum IX bears a round ventral lobe as wide as long, prolonged apex evenly tapering, moderately long.

Female abdomen: Described as Perlomyia sp. Ko 1 in Murányi et al. (2014, figs. 25–27).

Affinities. This species is appearently closely related to P. martynovi . Males can be distinguished on the basis of a distinct posteromedial lobe of tergum IX, lacking or vestigial on P. martynovi , and the less robust epiproct with a straight and evenly tapering tip. Females can be distinguished on the basis of the median sclerites, in P. koreana the inner keels are longer than remainder of the sclerites, whereas the keels are shorter in P. martynovi ; in P. koreana , the remainder of the sclerites are wider and lighter; darker brown and narrower in P. martynovi .

Distribution. Known from the central to southern portion of the Korean Peninsula, both from South and North Korea ( Fig. 34 ).

Etymology. The name koreana refers to its wide, and possible endemic distribution within the Korean Peninsula. The name is an adjective in female gender.

Figures

FIGURES 16 – 18. Male terminalia of Perlomyia koreana sp. n., paratype, South Korea, Gyeongsangbuk Province— 16: dorsal view; 17: ventral view; 18: lateral view— scale 0.5 mm.

FIGURES 32 – 37. Korean distribution of the genus Perlomyia Banks, 1906 — 32: P. baei sp. n.; 33: P. kiritshenkoi Zhiltzova, 1974; 34: P. koreana sp. n.; 35: P. lamellata sp. n.; 36: P. levanidovae (Zhiltzova, 1975); 37: P. mahunkai (Zwick, 1973) — circle with central dot indicates type locality.