Leuctra cedrus Vinçon, Dia & Sivec, Vincon, Dia & Sivec, 2014

Vinçon, Gilles, Dia, Aref & Sivec, Ignac, 2014, A New Stonefly From Lebanon, Leuctra Cedrus Sp. N. (Plecoptera: Leuctridae), Illiesia 10 (1), pp. 1-5: 1-4

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Leuctra cedrus Vinçon, Dia & Sivec


Leuctra cedrus Vinçon, Dia & Sivec  

Material examined. Holotype male: northern Lebanon, western slope of Lebanon Mount , Abou Aali water basin , Ouâdi Qâdîcha tor. , 500 m above Bcherré vil., 1500 m a.s.l., 24.04.1996, deposited in the Zoology Museum of Lausanne ( ZML) (type locality = 4 th site from top of map on Fig. 1 View Fig ).   One female paratype, El Kebir water basin: near Jabal Qammouaa Mount, Oudine vil., Nsara rheocren spr., 1440 m, 20.03.2008, 1♀ ( ZML) (1 st site from top on Fig. 1 View Fig View Fig ).  

Other material (from north to south on Fig. 1 View Fig ): El Bared water basin: 2 km from Sir El Danniyeh vil., El Ksaim spr., 1050 m, 20.04.1997, 1♀ (DIA).   Source Sir, 29.03.1997, 1♂ (PMSL).   Abou Aali water basin: Qâdîcha tor., 500 m> Bcherré vil., 1500 m a.s.l., 24.04.1996, 1♂ (VIN); 20.02.1996,? 1 larva (PMSL); 9.03.1997, 2♂, 1♀ (PMSL).   Ibrahim water basin: 5 km N. Afqa vil., Rouais spr., 1300 m, 9.03.2002, 1♂ (PMSL).   Aouali (Awali) water basin: Aouali River at Jdaidet ech Choûf bridge, 710 m, 18.02.1982, 1♀ (PMSL);   near El Moukhtàra village, rheocren karstic spr. (Mourched spr.) and Qachàqich br., 800 m, 19.01.1980, 1♂ exuviae (PMSL);   between Hâret Jandal et de Bâter ech Choûf vil., rheocren karstic spr. (Abou Kharma) and Ouâdi el Blaiyet br., 850 m, st 11, 19.01.1980,? 1 larva; near Jezzîne, Aazibi spr. and Nahr Aaray tor., 990 m, st 13a, 5.03.1980,? 1 larva (PMSL);   11.4.1982, 1♀ (DIA).  

Description. Medium sized Leuctra species   : ♂ body length 4,5-7 mm, ♀ 6,5-7,5 mm. Fore wing length ♂ 5- 6,8 mm, ♀ 7 mm. General colour brown. Head brown, slightly darker on the front. Antennae blackish, covered with a crown of long erect bristles at the tip of each segment; bristles as long as segment width. Pronotum brown with dark pattern. Legs yellow but tarsi, basal and distal parts of femora and tibiae contrastingly dark brown; tarsal segments brown. Body, veins of wings and legs covered with long erect hairs.

Male abdomen. ( Figs 2 View Figs a-c): tergites I-VI simple, tergites VII-X modified. Tergite VII slightly bulged in lateral view ( Fig. 2b View Figs ) and with narrow posterior membranous stripe ( Fig. 2a View Figs ). Tergite VIII with dark trapezoidal process widening distally and supported by two strong arms hardly prominent in lateral view ( Figs 2 View Figs a-b) and slightly separated in two parts by a small posterior triangular incision more or less visible according to the specimen. Tergite IX: antecosta divided for nearly a third of segment’s width; membranous median field with median butterfly-shaped sclerite. Tergite X anteriorly bilobed and with wide rounded posterior notch where epiproct is placed. Cerci rather short, covered with long erect setae. Epiproct rounded with short stalk ( Fig. 2a View Figs ). Styles of paraprocts with rounded base and long thin expansion gently curved toward tip ( Figs 2 View Figs b-c). Specilla long and thin, clearly longer than styles, rectilinear near the base and progressively curved toward tip, ending in sharp point ( Figs 2 View Figs b-c). Sternite IX: vesicle normal sized, racket shaped ( Fig. 2b View Figs ).

Female abdomen. ( Fig. 3 View Fig ): sternite VII with wide bellshaped bulged median sclerite and two small comma-shaped sclerites near the anterior edge, laterally. Sternite VIII: subgenital plate less long than wide, with sinuate edges, conspicuous median swelling, and two posterior well developed lobes separated by a large notch, about as wide as the width of one lobe ( Fig. 3 View Fig ). Lobes trapezoidal, strongly widening toward tip and with well-developed inner rounded expansions; posterior edge of the lobes nearly rectilinear. Plate poorly sclerotized medially except strongly sclerotized lobes ( Fig. 3 View Fig ).

Affinities. In the L. hippopus   group, L. cedrus   sp. n. appears rather isolated. The strong median process of tergite VIII is similar to that of several species: L. holzschuhi Theischinger, 1976   from Iran, L. meyi Braasch, 1981   from Caucasus, L. transsylvanica Kis, 1964   from Carpathians, L. joosti Braasch, 1970   from Balkans, L. niveola Schmid, 1947   and L. queyrassiana Ravizza & Vincon, 1991   from the Alps, however it is clearly different in shape from all of these and the genitalia are also obviously different. In the female, the rounded well developed lobes of the subgenital plate are similar to that of L. elisabethae Ravizza, 1985   , but the tip of the lobes are conspicuously wider in L. cedrus   sp. n. ( Fig. 3 View Fig ).

Geographical distribution and ecology. L. cedrus   sp. n. is a micro-endemic, cold stenothermal species confined to karstic rheocrene springs and torrents on the western slope of Mount Lebanon ( Figs. 1 View Fig , 4 View Fig ). The flight period extends in early spring (II-IV).

Etymology. This species is dedicated to the Lebanese highly symbolic tree Cedrus libanicus.


St Petersburg State University