Mesyatsia makartchenkoi Teslenko and Zhiltzova,

Hwang, Jeong Mi, Hur, Jun Mi, Kang, Ji Hyoun & Murányi, Yeon Jae Bae and Dávid, 2021, The first record of the winter stonefly genus Mesyatsia Ricker & Ross, 1975 (Plecoptera: Taeniopterygidae) from Korea, Journal of Species Research 10 (4), pp. 419-421 : 420-421

Mesyatsia makartchenkoi Teslenko and Zhiltzova,

1992 ( Figs. 1-3)

Mesyatsia makartchenkoi Teslenko and Zhiltzova, 1992: 57 .

Material examined. Korea: 1M, GW: Odaesan National Park , Odaesan-ro , Jinbu-myeon , Pyeongchang-gun , alt. 929 m, 37°47′34.58″N, 128°33′37.9″E, 2019-IV-23, Ham DS (by Sweeping) [ KUEM]; 1F, GW: Odaesan National Park , Odaesan-ro , Jinbu-myeon, Pyeongchang-gun, alt. 830 m, 37°47′5.67″N, 128°34′16.97″E, 2019-IV-23, Ham DS (by hand) [ KUEM]; 4M, same locality, 2021-II-19- IV-15, Hwang JM & Ham DS (by MT) [ KUEM]; 2M & 1F [ EKU], 1L, 6M [ KUEM], GW: Odaesan National Park , above Sangwonsa Temple , Odaesan-ro , Jinbu-myeon, Pyeongchang-gun, 37°47′35.8″N, 128°33′43.2″E, 2020- III-03, Hwang JM (by hand) ; 1M, GW: Odaesan National Park , Odaesan-ro , Jinbu-myeon, Pyeongchang-gun, alt. 941 m, 37°47′35.47″N, 128°33′43.19″E, 2020-III-03- IV-03, Hwang JM & Ham DS (by MT) [ NIBRIN 0000935762 ]; 2M, 1F, same locality, 2021-II-19-IV-15, Hwang JM & Ham DS (by MT) [ KUEM]; 1F, GW: Odaesan National Park , Odaesan-ro , Jinbu-myeon, Pyeongchang-gun, alt. 822 m, 37°47′4.20″N, 128°33′42.31″E, 2021-II-19-IV-15, Hwang JM & Ham DS (by MT) [ KUEM]; 1M, GW: Bangtaesan Natural Recreation Forest , Bangdong-ri , Girin-myeon , Inje-gun , alt. 680 m, 37°54′29.57″N, 128°24′25.14″E, 2019-IV-7-V-11, Ham DS (by MT) [ KUEM]; 10M, 4F, GW: Gariwangsan Natural Recreation Forest in Hoedong-ri, Jeongseon-eup, Jeongseon-gun, alt. 564 m, 37°25′12.91″N, 128°32′ 17.00″E, 2020-XI-04 - 2021-III-12, Park SW & Ham DS (by MT) [ KUEM]; 1L, 4M, 5F, GW: Gariwangsan Natural Recreation Forest in Hoedong-ri, Jeongseon-eup, Jeongseon-gun, alt. 697 m, 37°25′4.80″N, 128°31′ 27.51″E, 2020-XI-04 - 2021-III-12, Park SW & Ham DS (by MT) [ KUEM] .

Description. Male adult. General color yellowish brown to dark brown ( Figs. 1A, 3B ). Pronotum rectangular, dark brown ( Figs. 1A, 3B ). Wings hyaline with cloudy dark pattern, veins dark brown ( Fig. 1B, C). Pterostigma with dark spots ( Fig. 1B). Abdominal tergum 1 yellowish brown, membranous. Abdominal terga 2-9 dark brown and strongly sclerotized. Abdominal tergum 9 extended backwards laterally ( Fig. 1D). Abdominal sternum 9 with small vesicle ( Fig. 1F). Subgenital plate dark, large, strongly elongated, scoop-shaped, upcurved with tongue-shaped apex ( Fig. 1E). Abdominal tergum 10 medially divided into two, hairy lobes posteriorly ( Fig. 1D). Between these lobes are sclerotized finger-shaped processes of the basal plate of the epiproct positioned ( Fig. 1D). Cercus five-seg- mented, blunt ( Fig. 1D). Female adult. Abdominal sternum 8 with wide and dark pregenital plate and triangular vulvar sclerites ( Fig. 2A ). Postgenital plate of sternum 9 large, elongated, apex rounded subtriangular ( Fig. 2B ). Cerci with 6 segments.

Distribution. Korea (new record), Russia (Far East).

Remarks. This species was hitherto known only from Russia ( Teslenko and Zhiltzova, 1992; DeWalt et al., 2021). Most of the Korean specimens were collected by Malaise trap, but pharate larvae and adults crawling on the snow were also collected by handpicking ( Fig. 3 ).

Figures

Fig. 3. Habitat of Mesyatsia makartchenkoi Teslenko & Zhiltzova, 1992: South Korea, Odaesan Mts. A. larva, walking on the snow; B. adult, walking on the ice(photograph by Sunghwan Park).

Fig. 2. Mesyatsia makartchenkoi Teslenko & Zhiltzova, 1992, female.A. terminalia, ventral view; B. terminalia, lateral view. Scale bar=0.45mm.