On the Monacha species of Lebanon (Gastropoda, Hygromiidae) Author Neubert, Eike Author Bariche, Michel text ZooKeys 2013 311 1 18 http://dx.doi.org/10.3897/zookeys.311.5408 journal article http://dx.doi.org/10.3897/zookeys.311.5408 1313-2970-311-1 Monacha (Monacha) nummus (Ehrenberg, 1831) Figs 4, 5, 8 Caracolla nummus Ehrenberg, Symbolae Physicae: 8 [Syrien]. 1831 Helix oxygyra Charpentier, Zeitschrift fuer Malakozoologie, 4: 131 [Bei Nahr und Kelb [sic!], zwei Lieues noerdlich von Beirut, an Felsen]. 1847 Type specimens. oxygyra: syntype in MZL. Specimens examined. NMBE 508022/6, Nahr Ibrahim, Chouene, trail Chouene-Chouwan Lake, 34.081°N , 35.785°E , 450 m alt., 20.08.2008; NMBE 508021/2, Nahr Ibrahim, at the road between Chouaya and Yahchouch, 34.064°N , 35.728°E , 780 m alt., 20.08.2008; NMBE 508020/3, Nahr Ibrahim, 34.079°N , 35.679°E , 80 m alt., 20.08.2008; NMBE 508018/1, Qanater al Zbeideh, Nahr Beirut, 33.85°N , 35.556°E , 80 m alt., 19.08.2008; NMBE 508017/5, Nahr Abu Ali close to Seraad, 34.382°N , 35.93°E , 630 m alt., 19.08.2008; NMBE 508016/20, Nahr el Kelb, Jeita Grotto, cave entrance, 33.944°N , 35.641°E , 90 m alt., 16.08.2008; NMBE 508015/4, Nahr el Kelb, road to Jeita Grotto, limestone slope, 33.947°N , 35.637°E , 115 m alt., 16.08.2008; NMBE 506357/1, Wadi Abadieh, 33.8434°N , 35.6344°E , 310 m alt., 28.10.2011; NMBE 506356/4, Kfar Hbab, 34.006°N , 35.6552°E , 113 m alt., 27.10.2011; NMBE 506355/3, Kfour, 34.0348°N , 35.6952°E , 817 m alt., 27.10.2011; NMBE 506354/12, Adma, 34.0166°N , 35.6489°E , 85 m alt., 27.10.2011; NMBE 25953/5, Beirut, 33.8526°N , 35.4296°E , coll. A. Vogt ex Bohny; AUBM-MOLL 0466/9, AUBM-MOLL0478/1, AUBM-MOLL0480/13, Nahr el Kelb, 33.9547°N , 35.5975°E , 30 m alt., 26.09.2009; AUBM-MOLL0468/8, AUBM-MOLL0470/2, AUBM-MOLL0489/1, Ghazir, 34.0302°N , 35.6701°E , 326 m alt., 25.10.2009; AUBM-MOLL0476/5, Jeita, 33.9448°N , 35.6387°E , 88 m alt., 26.09.2009; AUBM-MOLL0552/2, Nahr Ibrahim, 34.0824°N , 35.802°E , 780 m alt.; AUBM-MOLL 0343/10, Nahr el Kelb, coll. Pallary; AUBM-MOLL0344/19, Tripoli, 34.4314°N , 35.8184°E , coll. Pallary; AUBM-MOLL0345/9, Jounieh, 33.3896°N , 35.6323°E , coll. Pallary. Diagnosis. shell large, biconvex, periphery with a sharply bounded keel, umbilicus narrowly opened, broad periomphalum. Description. shell large and flat, biconvex, shell colour grey to brown; protoconch consisting of two smooth whorls; teleoconch whorls with a dense pattern of white ribs, that extend to the glossy underside of the shell; suture marked by a white sutural thread; ca. six regularly increasing whorls, periphery with a sharply bounded crimped keel, sometimes spire stepped because of whorls attaching somewhat below the keel during shell growth; last whorl not descending; aperture obliquely oval with an acute palatal edge, sometimes with a faint white lip; peristomial rim sharply bounded and simple; umbilicus always open, narrow, with a broad periomphalum. Measurements. Syntype oxygyra: H = 5.91; D = 15.55; PH = 3.73; PD = 8.84. Fig. 5: H = 6.53; D = 16.15; PH = 3.39; PD = 8.67. Figures 4-7. Monacha spp. 4 Monacha (Monacha) nummus , syntype Helix oxygyra Charpentier 1847 , D = 15.55 mm 5 Monacha (Monacha) nummus , NMBE 508105, Beirut, Nahr el Kalb, Jeita Grotto, limestone rocks above entrance area to the cave, D = 16.15 mm 6 Monacha (Monacha) spiroxia (Bourguignat, 1868), lectotype MHNG 15378, Turkey, Alexandrette (= Iskenderun), D = 13.4 mm 7 Monacha (Monacha) carinata Hausdorf, 2000, holotype SMNS 50426, Turkey, Iskenderun, canyon of Sariseki, Iskenderun, D = 20.2 mm. - x 2, phot. Neubert, Richling. Figure 8. Distribution of Monacha (Monacha) nummus . Distribution. This species seems to be restricted to coastal regions in Lebanon. Remarks. This species can easily be confused with other keeled species known from the Levante area. To illustrate the differences, shells of Monacha (Monacha) spiroxia (Bourguignat, 1868) (Fig. 6) and Monacha (Monacha) carinata Hausdorf, 2000 (Fig. 7) are given. They differ in that the last has a larger shell with a more flat spire and a less pronounced keel. So far, these two species have only been recorded from the Hatay province of Turkey, while Monacha (Monacha) nummus seems to be restricted to Lebanon. Monacha (Monacha) spiroxia differs from Monacha (Monacha) nummus by being smaller, having a white lip in the aperture, a much narrower umbilicus and a teleoconch sculpture of small granules.