Perlomyia lamellata, 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 : 53-54

Perlomyia lamellata sp. n.

( Figs. 19–22 )

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

Perlomyia sp. Ko2— Murányi et al. 2014: 151 . (formal description of the female).

Type material. Holotype male: SOUTH KOREA: GW, Wonju-si , Sillim-myeon, Chiaksan (Mt.), 1.v.2016, leg. D.S. Ham ( KUEM) . Paratypes: GW, Wonju-si , Sillim-myeon , Chiaksan (Mt.), upper section of a forest brook towards Sangwon-sa, 930m, N37°18.071' E128°03.396', 14.v.2016, leg. J.M. Hwang, D. Murányi et al.: 2♂ 6♀ ( HNHM) . Lower section of the same brook, 850m, N37°18.047' E128°03.535', same date and collectors: 1♂1♀ (HNHM), 5♀ (KUEM). CB, Danyang-gun , Gagok-myeon, Eouigok-ri, Saebat , 25.v.2012, leg. Y.J. Bae; 10♀ ( KUEM) .

Diagnosis. Male: Tergum IX without posteromedial lobe, tergum X with paired knob laterally. Epiproct with wide, medially divided base, apical half claw-like, tip acute and evenly tapering. Cercus short but with strong terminal spine. Female: Sternum VII rectangular, with a posteromedial membranous area delimited by strong setae, not fused to sternum VIII. Median sclerites on sternum VIII are well separated, bean-shaped and as long as the segment's length; a small, rounded sclerite is present above the gap between median segments.

Description. Medium sized species, macropterous. Forewing length: holotype 5.9 mm, male paratypes 5.4–5.6 mm, female paratypes 6.0–7.0 mm; body length: holotype 4.7 mm, male paratypes 5.6–5.8 mm, female paratypes 5.8–6.6 mm. Head dark brown with distinct rugosities; antennae brown, palpi pale. Pronotum paler than head, longer than wide, 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 brownish. Setation generally short.

Male abdomen ( Figs. 19–21 ): Antecosta entire on terga I–IX but thin on terga III–VI, terga I–II with a median membranous field. Tergum IX with moderately curved antecosta, posteromedial portion concave, without lobe. Integument between terga IX–X with dense anterior field of setae and large, divided posterior field of very short setae. Tergum X with distint paired knob positioned laterally, antecosta of the hemiterga sinuous and with elongated anterior sclerite, posteromedial paired sclerites small. Epiproct with wide base, medially divided but its membrane is not protruding; the apical half is claw-like, evenly bent backwards, the tip is acute and evenly tapering. Paraprocts fused into a moderately wide, long lobe that is lightly sclerotized in its tip. Cercus short but with huge terminal spine that is slightly curved inwards, bears a small basodorsal lobe, apical wart not visible. Sterna I–VIII simple, Sternum IX bears a round ventral lobe as wide as long, prolonged apex with a basal swelling, moderately long.

Female abdomen ( Fig. 22 ): Described as Perlomyia sp. Ko 2 in Murányi et al. (2014, figs. 28–30) but some complements should be added, because some characters were faded on the single available specimen: Sternum VII with a posteromedial membranous area delimited by long and thick setae, and a small, rounded sclerite present above the gap between the median sclerites.

Affinities. The male is morphologically most similar to the Japanese P. kappa Sivec & Stark, 2012a and the Taiwanese P. angulata Sivec & Stark, 2012b , but can be easily distinguished from P. kappa by the acute tip of the epiproct, whereas from P. angulata by the presence of paired knob on tergum X of P. lamellata . As previously discussed ( Murányi et al. 2014), the female is distinctive, however, females of two Japanese species, including P. kappa , are unknown and cannot be compared.

Distribution. Known from the Taebaek Mountain Ranges both from South and North Korea, south to the northern Sobaek Mountain Ranges of South Korea ( Fig. 35 ).

Etymology. The name lamellata (from the Latin word lamellatus, meaning lamellated) refers to the distinctive median sclerites of the female. The name is used as an adjective of feminine gender.

Figures

FIGURES 19 – 22. Terminalia of Perlomyia lamellata sp. n., paratypes, South Korea, Gangwon Province— 19: male terminalia, dorsal view; 20: male terminalia, ventral view; 21: male terminalia, lateral view; 22: female sterna 7 – 8, 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.