Perlomyia baei, 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 : 49-51

Perlomyia baei sp. n.

( Figs. 11–15 )

Type material. Holotype male: SOUTH KOREA: 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 ( KUEM) . Paratypes: 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: 1♂ 1♀ ( NIBR), 1♂ 2♀ ( KUEM), 2♂ 1♀ ( HNHM) . GW, Hoengseong-gun , Anheung-myeon , Anheung-ri, Sancheongyo (Br.), 19.v.2010, leg. S.W. Jung: 3♂ ( KUEM) . GW, Wonju-si , Sillim-myeon , Chiaksan (Mt.), large stream at the upper parking lot towards Sangwon-sa, 620m, N37°17.635' E128°04.102', 14.v.2016, leg. J.M. Hwang, D. Murányi et al.: 1♀ ( HNHM) . GG, Yeoju-si , Geumsa-myeon, 13.v.2010, leg. S.W. Jung: 4♂ ( KUEM) .

Diagnosis. Male: Tergum IX with paired posteromedial lobes, tergum X without knobs or spines. Epiproct with wide, medially divided base; apical half claw-like, dilated above the callus, tip acute and slightly curved towards its base. Cercus short and rounded. Female: Sternum VII rectangular, with a small posteromedial membranous area, not fused to sternum VIII. Median sclerites on sternum VIII are dark brown and as wide as long, lack a keel, posterior edge straight and the apical half is square. One pair of sclerites attached to lateral edges of median sclerites have an eagle-head shaped anterior and sinuous posterior portion.

Description. Medium sized species, macropterous. Forewing length: holotype 4.6 mm, male paratypes 4.6–5.1 mm, female paratypes 6.6–6.9 mm; body length: holotype 4.6 mm, male paratypes 4.5–4.9 mm, female paratypes 6.2–6.8 mm. Head dark brown with distinct rugosities; antennae brown, palpi paler. Pronotum paler than head, one and half times longer than wide, narrower and shorter 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 brownish, venation brown. Setation generally short.

Male abdomen ( Figs. 11–13 ): Antecosta interrupted on terga I–III, entire on terga IV–IX, terga I–II with a median membranous field. Tergum IX with strongly curved antecosta, posteromedial portion bears two small lobes. Integument between terga IX–X with 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 sinuous and with small anterior sclerite, posteromedial paired sclerites small. Epiproct with moderatelly wide base, medially divided and its membranous portion slightly protruding; the apical half is claw-like, bears a membranous caudal callus with setae, evenly bent backwards but portion above the callus is dilated; the tip is acute and evenly tapering, slightly curved towards its base. Paraprocts fused into a moderately wide, long lobe that is lightly sclerotized in its tip. Cercus short and rounded, bears small basodorsal lobe, apical wart distinct, tip is slightly pointed. Sterna I–VIII simple, sternum IX bears an oval ventral lobe that is wider than long, prolonged apex angularly separated from the base of the sternum, moderately long.

Female abdomen ( Figs. 14–15 ): Terga I–IX membranous but with transverse row of four pigmented spots; a medial sclerotized patch also present on tergum IX. Tergum X fully sclerotized. Sterna I–VI simple. Sternum VII rectangular, with a small, posteromedial membranous area; not fused to sternum VIII. A thin, horseshoe-shaped spermathecal sclerite is visible after KOH-treatment. Median sclerites on sternum VIII are dark brown, bald and lack a keel; their posterior edge is straight and the apical half is truncate, while anterior half rounded and with small anterior projection. A small and indistinct, rounded sclerite present in front of the gap between the median sclerites. The median sclerites are laterally connected to additional bald and peculiarly shaped sclerites, having eagle-head shaped anterior and sinuous posterior portions, with the posterior portion connected to lateral edge of the setose tergum. Sternum IX with small, triangular anteriomedial indentation, sternum X medially connected. Paraproct and cercus simple.

Affinities. The species is closely related to the widespread continental P. smithae , but the male can be distinguished on the basis of the epiproct. The epiproct of P. smithae is evenly bent with a tapering apex with a straight tip, whereas in P. baei the epiproct is dilated above the callus and tip is slightly curved towards its base. The female of P. baei is distinct from P. smithae , having a smooth median sclerite with square apical half, and different sclerites on lateral portion of sternum VIII. Configuration of sclerites on sternum VIII already distinguishes it also from other congeners.

Distribution. Known only from the northen South Korea ( Fig. 32 ).

Etymology. The species is dedicated to Prof. Yeon Jae Bae, Korea University, Seoul, in recognition of his work on Korean stoneflies. The name is used as the genitive of a noun of male gender.

Figures

FIGURES 11 – 15. Terminalia of Perlomyia baei sp. n., paratypes, South Korea, Gapyeong Province— 11: male terminalia, dorsal view; 12: male terminalia, ventral view; 13: male terminalia, lateral view; 14: female sterna 7 – 8, lateral view; 15: female terminalia, ventral 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.