Euchondrus paucidentatus, Gümüş & Neubert, 2012

Guemues, Burcin Askim & Neubert, Eike, 2012, New taxa of terrestrial molluscs from Turkey (Gastropoda, Pristilomatidae, Enidae, Hygromiidae, Helicidae), ZooKeys 171, pp. 17-37 : 21-22

Euchondrus paucidentatus sp. n. Fig. 18

Type specimens.

Holotype NMBE 32688; paratypes NMBE 32689/15, coll. BANK/2; Turkey, Vil. Şanlıurfa, Nusaybin, bridge over the Çağ Çağ Deresi, 37.09°N, 41.215°E, 470 m alt., 4.8.1988, leg. E. Neubert.

Diagnosis.

A medium sized species of Euchondrus , shell of broad conical shape, brown, dentition reduced to a parietalis, a columellaris and two palatal denticles.

Description.

Shell medium sized, protoconch of 2 whorls, smooth; shell colour consistently brown; shell of broad conical shape with a rounded to semi-ovate aperture; whorls of the teleoconch well rounded, increasing regularly, the suture of medium depth with a whitish sutural line; surface of the teleoconch almost smooth, a faint sculpture of fine riblets or growth lines existing; aperture rounded, reinforced by a labial callus, apertural rims widely gaping on the parietum, reflected; dentition reduced, consisting of a cone shaped parietalis, a small columellaris, and two palatal denticles, with the lower denticle being always stronger if compared to the upper palatalis; columellar rim of the aperture widely reflected; umbilicus slit-like open, elongate.

Measurements.

Holotype: H = 7.76; D = 3.74; PH = 2.95; PD = 2.4; W = 8.

Etymology.

This species is called paucidentatus (Latin = poor in teeth) reflecting the reduced dentition of this species.

Remarks and differential diagnosis.

This species is similar to Euchondrus ledereri (L. Pfeiffer, 1868) by its reduced dentition ( Figs 19, 20 ), but in this species, there is always an angularis (and sometimes even an infraparietalis) present. Moreover it differs by its larger shell, which is usually white (and not brown), and the more cylindrical shape of the teleoconch. Some species of Euchondrus from Cyprus show a similar tendency to teeth reduction ( Euchondrus limbodentatus (Mousson, 1854), Euchondrus nucifragus (L. Pfeiffer, 1848) and its subspecies, and Euchondrus parreyssi (L. Pfeiffer, 1846)). However, these species show an extreme development of the labial callus, which is in clear contrast to the regularly sized lip in the new species ( Bank and Hovestadt 1991).

Distribution.

So far, this new species is only known from its type locality.

Figures

Figures 13 - 23. Enidae. 13 - 20 Euchondrus spp. 13 Euchondrus septemdentatus, syntype Pupa septemdentata, SMF 236888, Israel, Jerusalem, coll. Rossmaessler ex Roth, Original figure from Iconographie (1), No. 922, H = 9.75 mm 14 lectotype Bulimus triticeus (type designation herewith based on an unpublished designation by Zilch), SMF 236889, Israel, Jerusalem, coll. Rossmaessler ex Stentz, H = 9.4 mm 15 Euchondrus septemdentatus, NMBE 503001, Lebanon, Beirut, next to Soha water plant, 33 ° 45.117 ' N, 35 ° 45.213 ' E, 1474 m alt., 17.08.2008, leg. E. Neubert, H = 9.4 mm 16 syntype Chondrus septemdentatus var. borealis, ZMZ 514110, Turkey, between Mersin and Tarsus, coll. Mousson ex Schlaefli, 1861, H = 10.5 mm; 17 Euchondrus septemdentatus, SMF 312409, Turkey, 2.5 km SE Belen, leg. Menkhorst 18 Euchondrus paucidentatus sp. n., holotype NMBE 32688, Turkey, Vil. Sanliurfa, Nusaybin, bridge over the Cag Cag Deresi, 37.09 ° N, 41.215 ° E, 470 m alt., 4.8.1988, leg. E. Neubert, H = 7.76 mm 19 Euchondrus ledereri, SMF 312412, Turkey, Mesindagi Gecidi, 15 rkm SE Eruh (= Dih), along the road to Sirnak, 37.672 ° N, 42.316 ° E, 1620 m alt., 03.08.1988, leg. Neubert, H = 10.2 mm 20 Euchondrus ledereri, NMBE 503488, Lebanon, Nahr Abu Ali close to Seraad, 34.283 ° N, 35.9288 ° E, 573 m alt., 19.08.2008, leg. Neubert, H = 8.32 mm 21 - 23 Rhabdoena spp. 21 Rhabdoena gostelii sp. n., holotype NMBE 33331, Vil. Erzincan, Kemaliye, Dilli Deresi, 39.315 ° N, 38.44 ° E, 870 m alt., 10.7.2005, leg. B. A. Guemues, H = 20.96 mm 22 Rhabdoena armenica, lectotype SMF 63431, " NW Armenia (?) ", coll. Naegele ex Tembe, H = 14.6 mm 23 Rhabdoena cosensis, lectotype Buliminus (Zebrina) caesius O. Boettger, 1885, SMF 14485, Turkey, " Smyrna " [= Izmir], coll. O. Boettger ex Goldfuss, H = 17.9 mm. -- All figures scaled x 5.