Leuctra muranyii Vinçon & Graf, 2011

Vinçon, Gilles & Graf, Wolfram, 2011, Two New Alpine Leuctra In The L. Braueri Species Group (Plecoptera, Leuctridae), Illiesia 7 (9), pp. 92-103 : 92-95

Leuctra muranyii Vinçon & Graf sp. n.

( Figs. 2-4 )

Material examined. Holotype ♂. ITALY: W. Lombard Prealps: N. Erba , San Primo Mount,> Magreglio, 1400m, 26.10.08 (Vin.) . Other material. Paratypes: same date and locality: 11♂, 7♀; ITALY: Orobie Alps: N. Lecco, between Ballabio and Maggio, Service station, b., 29.11.98, 3♂, 12♀, 10.10.99, 3♂, 11♀ (Vin.); Val Brembana, Zambla b., 1050m, 30.10.72, 1♂, 2♀; 15.10.73, 1♂, 1♀; Val Brembana, Camerata Cornello, Brembo R., 450m, 2♂, 3♀; Val Gerola (Valtellina) Pedesina R. 1000m, 23.09.76, 3♀ (Rav.); E. Lombard Prealps: N. Brescia, Val Trompia, Collio b., 600 m, 20.08.75, 1♂ (Rav.); N.E. Brescia,> Vestone,> Forno d’Ono, Degnone tor., 29.11.98, 2♂, 11♀; NW. Riva di Garda, Concei Valley, 10.09.99, 9♀ (Vin.). Vezza d’Oglio, Val Grande, 46°10.16.2’N, 10°23’51,9’’E, 6.10.09, 900m 3♂, 5♀, leg. P. Neu; 46°14’59.0’’N, 10°23’45.1’’ 1390m, 6.10.09, 1♀, leg. P. Neu. Rhaetian Alps: W. Bormio, road to Livigno, <San Carlo, b., 1450m, 27.10.08, 39♂, 26♀,> San Carlo, 1650m, spr., 26.10.08, 14♂, 13♀; S. Bormio, Grosio  Monno, Foppa Pass N. slope, 1450m, 26.10.08, 9♂, 16♀, S. slope, 1750m, spr, 26.10.08, 5♂, 5♀ (Vin.); Tonale pass, b., 1900m, 04.09.80, 6♂, 6♀ (Rav.), 10.10.99, 1♂, 2♀ (Vin.); Tonale Pass, W. slope, b.> Ponte di Legno, 26.10.08, 28♂, 15♀; b., Tresenda  Aprica, 10.10.99, 1♂, 22♀; Tonale Pass., E. slope, spr., 1900m, 10.09.99, 1♂, 2♀; 1800m, 10.09.99, 7♂, 10♀, 26.10.08, 5♀; S. Madonna di Campiglio, Nambrone Valley  Nambino lake, 1700m, 10.09.99, 2♀ (Vin.). Venetian Prealps: SW. Trento, Cornetto Mount, Cei Valley,> Aldeno, 28.11.98, 9♂, 16♀ (Vin.). Baldo Mount:> Avio, Aviana tor. <dam, 1012m, 11.09.08, 1♂,> St Valerio, small cascade, 11.09.08, 16♂, 2♀, <Bocca di Navene, 1400m, spr., 11.09.08, 4♂, 3♀ (Vin.). SE. Trento:> Vattaro, La Fricca Pass, 1000m, 10.10.08, 13♂, 18♀;> Carbonare  Lavarone, 1100m, 10.10.08, 1♂, 7♀; S. Levico Terme, Vezzena Pass, 1400m, spring, 28.11.98, 1♂, 14♀; 27.10.08, 5♀; <Folgaria, Molini, 700m, 18.09.09, 4♂, 11♀ (Vin.). Grappa Mount:> Seren del Grappa, Avien Pian de Giacon, 426m, Stizzone tor., 10.10.08, 1♀; spring, 500m, 10.10.08, 9♂, 19♀; spring, 750m, 10.10.08, 1♂, 1♀ (Vin.). Dolomites:> Ortisei, Passo di Pinei, spr., 1400m, 18.09.09, 14♂, 15♀; NE. Bolzano, Fie Sciliar  Presule, 18.09.09, 9♂, 9♀ (Vin.). S. Bolzano, Lavazze pass: <Rauth Novale, 1200m, 27.10.08, 4♂, 12♀, Stava, 1224m, 27.10.08, 1♀ (Vin.). E. Predazzo, Val di Viezena, 1200m, 27.10.08, 10♂, 16♀; <San Martino di Castrozza, 1350m, spr., 27.10.08, 3♂, 6♀, 1400m, tor., 27.10.08, 2♂, 2♀ (Vin.). S. Dolomites: E. Trento,> Pergine Valsugana, Frassilongo, 850m, 28.11.98, 1♂, 3♀; NW. Feltre, Croce d’Aune Pass, 800m, 28.11.98, 3♂, 5♀ (Vin.). Manghen Pass: spr.,> Telve, 950m, 10.10.08, 15♂, 23♀, spr., 1400m, 10.10.08, 25♂, 30♀, crossroad to Valtrighetta, 1425m, brooklet, 10.10.08, 16♂, 14♀ (Vin.). SWITZERLAND: Grisons: Rhaetian Alps: Bernina Pass,> Miralago, tor., 950m, 26.10.08, 1♂, 9♀;> St Carlo, 26.10.08, 26♂, 33♀; Val Müstair: road to the Fuorn Pass, Tschierv, Rom trib., Adige trib., 1700m, 3♂, 5♀, 11.10.99; 1♂, 1♀, 29.06.09 (Vin.); Rom trib., Sta Maria im Müstair, 1340m, 17.09.50, 18♂, 17♀ (Aub.); idem, 3.09.93, 4♂, 6♀ (Lubini leg., Aub.). Tschierv, Tschierv-Orasom Riv., 1646m, 13.07.2004, 1♀, 2 larvae (Vicentini coll.); Ofenpass, Buffalora Riv., 2120m, 8.09.2004, 1♂, 2♀ (Lubini coll.). AUSTRIA: Rhaetian Alps:> Martina (Martinsbruck)  Nauders, Inn trib., spr., 1400m, 18.09.09, 4♂, 20♀; Reschenpass (Passo di Resia), Inn trib., 1520m, 18.09.09, 4♂, 10♀ (Vin.).

Description. Medium sized species: body length: male 7.0- 7.4 mm, female 9.2-9.7 mm. Macropterous, wing length: male 5.5-6.5 mm, female 7.8-8.1 mm. General colour brown. Head brown with dark granulation on the occiput. Antennae dark brown with a crown of long bristles at the tip of each antennal segment; bristles are almost as long as an antennal segment. Pronotum brown with dark marks; long bristles are present on its anterior margin near the corners. Legs brown, covered with long erect setae; darker longitudinal bands are present on the femora. Long erect setae are also present on the base of the main wing veins.

Male ( Figs. 2-3 ). Terga I-V normal; posterior part weakly sclerotized. Tergite VI: antecosta strong, not divided; median membranous field wide and bellshaped. Tergite VII similar, carrying two strong triangular teeth projecting upward and rearward from the antecosta; the teeth are separated by a triangular notch about as wide as the width of one of them. Tergite VIII: antecosta interrupted for about half the segment’s width; the median membranous field is bell-shaped. Tergite IX: antecosta widely open; the median membranous field carries a trapezoidal pigmented sclerite with two less pigmented anterior spots. Tergite X: anterior margin bilobed as usual in the genus, posterior margin with wide rounded median notch. Epiproct slim, racketshaped; the stalk is about as wide as the rounded apex. Cerci long and slim, with vestigial second segment. Sternite IX: vesicle short and rounded, without stalk. Specilla nearly straight, strong at their base and getting thinner toward their apex. Paraprocts: styles thin, slightly shorter than their base, ending in an acute tip widely separated from the tip of the specilla ( Fig. 3 ). The paraproct’s base is not flanked by a distinct lateral lobe, it carries a posterior sclerotized expansion that extends between the style and the cercus base. The base of the paraprocts is split in two parts separated by a membranous field, the anterior part is connected to the base of the specillum and the posterior part is prolonged rearward by the styles, but it might be hardly visible if the paraproct base is hidden under the previous segment, as in Fig. 3 .

Female ( Fig. 4 ). Subgenital plate wide, rounded, less pigmented medially that on its edges, and covered with long hairs. The two lobes are globular, extending backward, and separated by a rounded notch about as wide as the width of one lobe; their apices are separated by a more or less wide space. Spermatheca globular and without visible armature.

Affinities. This species is closely related to L. braueri and L. juliettae sp. n. The male differs mainly in the shorter styles of the paraprocts and by the epiproct having a slim apex. The female lobes of the subgenital plate are narrower and longer than in L. juliettae sp. n. ( Fig. 7 ) and they are less widely separated at their base than in L. braueri ( Fig. 10 ).

Distribution and ecology. L. muranyii sp. n. occurs in the south eastern Alps ( Fig. 1 ). Its western limit is the high range of mountains that extends along the Italian and Swiss (Ticino) border from the lake Lugano up to the Spluga Pass (Splügenpass, 2113m). Its eastern limit is the wide Piave River, in the surroundings of Belluno. Northwards it is mainly reported from the southern slope of the Alps (Po drainage basin). It occurs in Italy and Switzerland (Val Bernina and Val Müstair) but it also crosses the Austrian border and enters the Inn valley, a main Danube tributary. In the northern part of the Lessini Mountains, it is sympatric with its sister species, L. juliettae sp. n. It is a crenophilic species occurring in mountain springs and brooklets (400-1900 m). The flight period is in autumn (VIII-XI) but a few adults were also collected the 29.06.2009 ( CH: Müstair valley).

Etymology. This species is dedicated to the Hungarian entomologist D{vid Mur{nyi for his major contribution to our knowledge of Central and Eastern European stoneflies.

Figures

Figs. 2-4. Leuctra muranyii sp. n.: male abdominal tip in dorsal view (2), male genitalia in ventral view (3), female subgenital plate in ventral view (4).

Figs. 5-7. Leuctra juliettae sp. n.: male abdominal tip in dorsal view (5), male genitalia in ventral view (6), female subgenital plate in ventral view (7).

Figs. 8-10. Leuctra braueri kempny: male abdominal tip in dorsal view (8), male genitalia in ventral view (9), female subgenital plate in ventral view (10).

Fig. 1. Distribution areas of Leuctra braueri Kempny, L. juliettae sp. n. and L. muranyii sp. n. within the Alps.