Multidentula reducta, Ruud, A. Bank, Henk P. M. G Menkhorst & Eike Neubert, 2016

Ruud, A. Bank, Henk P. M. G Menkhorst & Eike Neubert, 2016, Descriptions of new and little-known land snail taxa from Turkey, and establishment of a new genus (Gastropoda, Pulmonata: Lauriidae, Enidae and Vitrinidae), Basteria 80 (1), pp. 5-30 : 23

Multidentula reducta spec. nov. ( Fig. 19 )

Type locality & type specimens. – Turkey, Vilayet Sivas, Zara, 16 km towards Imranlı , 1400 m (39.8606°N 37.8765°E), H.P.M.G. Menkhorst leg., 15.vii.1988. Holotype NMBE 544681 , paratypes NMBE 544682/1, HMK/12, RBA/1, RMNH/1.

Diagnosis. – A middle-sized, oval Multidentula species with fine oblique striae, a missing suprapalatalis and a weakly developed or missing basalis, an oblique infrapalatalis, a non-fused subangularis , and a parietalis that is only slightly curved.

Description. – Shell dextral, oval in outline, with a rather wide, open, slit-like umbilicus. The 6.0-7.2 whorls are convex with a rather deep suture. Teleoconch with irregular, sparse, oblique striae which are mostly rather fine; there are no spiral striae. Shell rather solid, slightly translucent, yellowish to horny yellowish, with a whitish band behind the peristome. The last whorl has no or only an indistinct impression and only the infrapalatalis is visible outside as a blurred white stripe. Peristome well reflected, thickened by a prominent labial callus, the columellar and palatal insertion connected by a clearly visible callus (but the callus is not extra thickened near the insertions). The subangularis is vertically pointing downwards, and is connected (but not fused) with the palatal peristome by a callus. The subangularis and parietalis are connected by a thin callus. Parietalis prominent, slightly curved and deeply recessed. A spiralis is missing. Columellaris ± oblique to the columellar peristome, deeply recessed. The basalis is absent, or present as an indistinct thickening only. Infrapalatalis well developed, oblique, and always stronger developed than the non-oblique palatalis superior. There is no suprapalatalis; a small suturalis is present.

Measurements (n = 6). – H = 5.3-6.9 (mean 6.1); LWH = 3.2-3.8 (mean 3.5); MH = 2.1-2.4 (mean 2.2); LWD = 2.7-2.8 (mean 2.8); LWM = 2.7-3.0 (mean 2.8); MD = 1.7-1.9 (mean 1.8); NW = 6.0-7.2 (mean 6.6).

Localities. – Known from the locus typicus only (see above).

Derivatio nominis. – The name refers to the reduced apertural armature.

Differentiation. – The armature of M. reducta is generally reduced: a basalis is absent or only weakly developed, a suprapalatalis is missing, and the parietalis is not as prominent and less curved as in M. squalina or M. pupoides . The palatal folds are, compared to M. squalina , also less deep in the aperture, but are placed closer to the peristome.

Figures

Figs 16 - 20. Multidentula and Imparietula taxa from Turkey. 16, Multidentula squalina squalina (L. Pfeiffer, 1848), NMBE 548313 (H = 7.8 mm), Turkey, Vil. Karabük, eastern part Eskipazar, leg. Hausdorf, 27. ix. 1987. 17, Multidentula squalina eudoxina (Nägele, 1894), paralectotype SMF 14195 a coll. Kobelt ex Nägele (H = 6.3 mm), Turkey, Vil. Tokat, Tokat. 18, Multidentula squalina acutior (Lindholm, 1922), NMBE 544678 (H = 5.7 mm), Turkey, Vil. Artvin, N. Kınalıçam (= NNW. Cağliyan). 19, Multidentula reducta spec. nov., holotype NMBE 544681 (H = 6.2 mm), Turkey, Vil. Sivas, Zara, 16 km towards Imranlı. 20, Imparietula inflexa spec. nov., holotype NMBE 544683 (H = 12, 4 mm), Turkey, Vil. Giresun, 5 km N. Tamdere (= S. Yavuzkemal). All photographs Bochud & Neubert, × 8.