Amphinemura steinmanni Zwick 1973

Murányi, Dávid & Park, Sun Jae, 2011, Contribution To The Fall Stonefly (Plecoptera) Fauna Of Korea, Illiesia 7 (6), pp. 70-85 : 71

Amphinemura steinmanni Zwick 1973

( Figs. 1-2 )

Amphinemura steinmanni Zwick 1973 — Zwick 1973a:158. (original description of the male and the female from People’s Republic of Korea); Zhiltzova 2003:181. (monograph, with the original figures); Teslenko & Zhiltzova 2009:113. (key, with the original figures).

Material examined. PEOPLE’S REPUBLIC OF KOREA: Kanwon Province, Diamond Range, Hotel Go-song , 29.05.1970, leg. S á ndor Mahunka, Henrik Steinmann: holotype ♂, 1♀ paratype ( HNHM); same locality and collectors, 01.06.1970: 2♀ paratypes ( HNHM). REPUBLIC OF KOREA: Gangwon Province, Yangyang-gun, Seorak Mts., Hangaeryeong Pass , 1.5km S of the rest area, brook in deciduous forest, 875m, N38°05.481’ E128°24.267’, 09.09.2010, leg. L á szló Forró, György Makranczy, D á vid Mur á nyi, Sun Jae Park, Jung Do Yoon: 1♂ ; Jeollabuk Province, Muju-gun, Deokyu Mts., Sugyeongdae , 1km S of the settlement, clearing edge above a road, 640m, N35°53.888’ E127°46.378’, 13.09.2010, leg. Hye Woo Byeon, Tae Woo Kim, György Makranczy, D á vid Mur á nyi: 4♂ 2♀ ; Jeollabuk Province, Muju-gun, Deokyu Mts., Baekryeon Temple , towards Osujagul Cave , tributary of Gucheondong Stream in deciduous forest, 985m, N35°51.069’ E127°46.169’, 14.09.2010, leg. Hye Woo Byeon, Tae Woo Kim, György Makranczy, D á vid Mur á nyi: 2♀ ; Jeollanam Province, Gurye-gun, Jiri Mts., Mt. Nogodan , at Nogodan shelter, brook in bamboo-mixed deciduous forest, 1350m, N35°17.740’ E127°31.574’, 15.09.2010, leg. Tae Woo Kim, D á vid Mur á nyi: 1♂ 1♀ ; Gyeongsangnam Province, Sancheong-gun, Jiri Mts., Ogeok Valley , 3km NW of Daewon Temple, N branch of Yup-yeong , open spring and its outlet at forest edge, 675m, N35°22.926’ E127°47.112’, 16.09.2010, leg. Hye Woo Byeon, L á szló Forró, Tae Woo Kim, György Makranczy, D á vid Mur á nyi: 8♂ 7♀ (one female terminalia prepared on slide, used for drawings Figs. 1-2 ) .

Female internal genital sclerites ( Figs. 1-2 ). Anterior shield small and rounded, with large sclerotized tube which leads into the membraneous spermatheca. The tube is barely anteriorly widened, and has two short fingers posteriorly. Laterally to the anterior shield, lightly sclerotized folded hemispheres are ventrally attached to a large medial, spherical membranous area. Posteriorly to this spherical membrane, a caudally flattened wide sclerite is attached. Dorsal part of this sclerite has two folded arms that are weakly divergent posteriorly. Posteriomedially, from the meeting point of the dorsal arms, a strongly sclerotized crest leads to the ventral end of the sclerite, and its ventral tip is undivided and attached to the anterior end of the narrow notch in the subgenital plate.

Affinities. Internal sclerites are similar to those of A. denstigris Zwick 2010 , but differ by the smaller anterior shield and the shape of its tube and by the posterior sclerite having weakly divergent dorsal arms. Neither the size nor the position of components was changed when the specimen was flattened by slide mounting, but remained as seen in a three dimensional aspect after clearing in KOH.

Notes. The female used for the illustrations was collected in copula, and its internal structures agree with the female paratypes. The description of inner structures of this species was not possible ( Zwick 2010) because at that time the HNHM allowed no loans of type specimens. Fortunately, the museum returned to loaning types in 2011.

Geographical distribution and ecology. The species is known from the entire Korean Peninsula and the South of the Russian Far East ( Zwick 2010). Adults were reported to occur from May to August ( Zhiltzova 2003). Our specimens found in September were all fully pigmented and probably represented the latest adults of the season. They were found at small forest brooks and a spring outlet, all with slow or moderately fast flow and with stony or gravelly substrate mixed with sand or even silt. Specimens were found in association with up to five species, but also as the single stonefly of a particular habitat ( Table 1 ).

Figures

Figs. 1-2. Female genitalia of Amphinemura steinmanni Zwick 1973. 1: internal genital sclerites, dorsal view; 2: pregenital, subgenital and paragenital plates, with transparency of internal sclerites, ventral view (scales 0.1 mm).