Assyriella thospitis menkhorsti, 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 : 25-26

Assyriella thospitis menkhorsti ssp. n. Fig. 28

Type specimens.

Holotype NMBE 33333, paratypes NMBE 16599/3, Turkey, Bitlis, Kireçtaşı, quarry, 38.37°N, 42.1°E, 9.5.2011, leg. & ex coll. Menkhorst; additional paratypes HMT/16.

Additional specimens examined.

Bitlis 1.8 km NE. Kokarsu, 1723 m alt., 38.3942°N, 42.2685°E, 10.5.2011, HMT/6.

Diagnosis.

Stronge rib sculpture on the teleoconch, presence of greenish-yellowish periostracum and a columellar ridge on the basal apertural rim.

Description.

Large shells, depressed to slightly elevated spire; protoconch with 1.5 flat and slightly ribbed whorls; last whorl strongly descending at the aperture; teleoconch sculpture of regular axial riblets; basic shell colour greenish to yellowish due to the periostracum; spiral bands bluish; aperture cross-oval, reinforced by a labial callus, moderately reflected; umbilicus slit-like open to sometimes closed; columellar labial callus or ridge present.

Measurements.

Holotype: H = 19.8; D = 33.46; PH = 7.2; PD = 21.6; W = 4.75.

Etymology.

This new subspecies is named in honor of Dipl. Ing. H. P. M. G. Menkhorst, a keen malacologist, to acknowledge his deep interested in and outstanding contributions to the knowledge of the biodiversity of the Turkish malacofauna.

Distribution.

Assyriella thospitis menkhorsti ssp. n. lives in a small area southeast to the range of the nominotypical subspecies ( Schütt and Subai 1996: 118, 141).

Remarks and differential diagnosis.

This subspecies differs from the nominotypical subspecies in several character states ( Fig. 27 ). The main character states are the stronger rib sculpture on the teleoconch, the bluish spiral bands (brown in Assyriella thospitis thospitis Schütt & Subai, 1996), the greenish-yellowish periostracum (almost transparent and colourless in Assyriella thospitis thospitis ), the usually slit-like umbilicus (always closed and thickly calloused in Assyriella thospitis thospitis ), presence of a ± well developed columellar ridge on the basal apertural rim.

Figures

Figures 27 - 28. ssp. Figure 27 Assyriella thospitis thospitis, holotype NNM 56804, Bitlis, Kermate, 10 km SW of Setek, 1550 m alt., May 1990, leg. Neuteboom, D = 37.6 mm 28 Assyriella thospitis menkhorsti ssp. n., holotype NMBE 33333, Bitlis, Kirectasi, quarry, 38.37 ° N, 42.1 ° E, 9.5.2011, D = 33.46 mm. - All figures scaled x 1.5.