Alloperla picta Zwick, 1973

Hwang, Jeong Mi, Kang, Ji Hyoun & Murányi, Jun Mi Hur and Dávid, 2023, Poorly known Chloroperlidae (Plecoptera) from Korea, addressing a certain problem of limits between Alloperla Banks, 1906 and Sweltsa Ricker, 1943, Journal of Species Research 12 (4), pp. 326-331 : 327

1. Alloperla picta Zwick, 1973 ( Figs. 1-3 , 20 )

Alloperla picta Zwick, 1973: 165 .

Material examined. South Korea: 2♂ ( KU), Chungcheongbuk-do, Danyang-gun, Gagok-myeon, Eouigok-ri , Saebat , 2012.V.25, Bae YJ (by Sweeping); 1♂, 2$( KU), Gangwon-do , Wonju-si , Sillim-myeon , Chiaksan National Park , 2016.V.14, Bae YJ (by Sweeping); 3♂, 2$( EKCU), Gangwon-do , Wonju-si , Sillim-myeon , Seongnam-ri , Chiaksan National Park , Saem Spring beneath Sangwon-sa , 1025 m, 37°18.284′N 128°03.262′E, 2016.V.14, Hwang JM, Murányi D; 1$( EKCU), Gangwon-do, Wonju-si, Sillim-myeon, Seongnam-ri, Chiaksan National Park , lower section of the forest brook towards Sangwon-sa, 850 m, 37°18.047′N 128°03.535′E, 2016.V.14, Hwang JM, Murányi D; 2♂, 1$( KU), Gangwon-do, Inje-gun, Girinmyeon, Bangdong-ri, Bangtaesan Natural Recreation Forest , 690 m, 37°54′29.57″N 128°24′25.14″E, 2019.V.11 - VI.21, Malaise trap, Ham DS, Park SH; 3♂, 1$( KU), Gangwon-do, Pyeongchang-gun, Jinbu-myeon, Odaesan-ro, Odaesan National Park , Mireukam Temple, 1296 m, 37°48′12.82″N 128°34′03.02″, 2020.VI.23 - VII.28, Malaise trap, Ham DS, Hwang YM, Kang JH, Park SH; North Korea: Holotype $ ( HNHM), Gangwon Province, Kosong-gun, Kumgang Mts , Manmul-sang Rock (locality No. 68), 38°43′N 128°07′E, 1970.V.30, Mahunka S, Steinmann H.

Description of the male adult. Coloration and pattern of available males and females fully agrees with the holotype female (compare Fig. 20 with Figs. 27 - 28 in Zwick, 1973). Forewing length of males 6.8 - 7.3 mm, males 7.8 - 8.3 mm (holotype female 8.5 mm).

Antecosta of tergum 9 well sclerotized, medial portion slightly rised in lateral view but not modified into cones or teeth ( Fig. 1 ). Caudal margin of tergum 9 widely and roundly excised, its lateral portions are darkly colored ( Fig. 2 ). Sternum 9 developed into rounded subgenital plate, laterocaudal margins of segments 8 - 9 are armed with comb-like setae. Tergum 10 completely divided into rounded hemiterga by the large epiproct; their antecosta well sclerotized, posterior half of hemiterga darkly coloured ( Fig. 2 ). Epiproct consists of large basal anchor with lateral arms, distinct paragenital plates and elongated, curved epiproct tip connected to basal anchor with weakly sclerotized lewer arm ( Figs. 1 and 3 ). The basal anchor is elongated triangular, with rounded anterior portion hidden beneath the posterior excision of tergum 9 ( Fig. 1 ); lateral arms narrow finger-like, directed slightly posteriorly. Paragenital plates narrow and long, curved like a question mark. The epiproct tip connected to the lower arm with a joint, basal portion widened and complexly sclerotized, then continued in evenly sclerotized apical portion that reaches back to the anterior portion of basal anchor; the tip is straight in posterior view with keeled, arrow-like apex, distinctly curved ventrally in lateral view, medially narrowed and apically widened again, with short and rounded, membranous apex beneath the dorsal arrow-like portion ( Figs. 1 - 3 ). Penial sac unarmed, lobes not observed.

Affinities. While the female subgenital plate clearly indicates Alloperla , the terminalia of the male reminds to regional Sweltsa and clearly different from Asian Alloperla . Both coloration and terminalia reminds the most to the males of S. bilobata Mo, Ye, Wang & Li, 2020 and S. brevihamula Dong, Cui & Li, 2018 , but the lateral view of the epiproct tip distinguish A. picta from all other Sweltsa and Alloperla .

Distribution. Korea (South and North).

Remarks. This species was previously known only from the female holotype collected in North Korea ( Zwick, 1973). We have described the male of this species based on several specimens collected with females in South Korea.

Figures

Figs. 1-3. Male terminalia of Alloperla picta Zwick, 1973. 1: lateral view; 2: dorsal view; 3: epiproct and adjacent sclerites, oblique dorsocaudal view.Scale bar=0.5 mm.

Figs. 20-22. Habitus of Korean Chloroperlidae. 20: Alloperla picta Zwick, 1973, male; 21: Alloperla tiunovae Teslenko, 2009, male; 22: Haploperla maritima Zhiltzova & Levanidova, 1978, male. Scale bars=1 mm (photograph by Wongyu Lee).