Montenegrina grammica improvisa, Feher, Zoltan & Szekeres, Miklos, 2016

Feher, Zoltan & Szekeres, Miklos, 2016, Taxonomic revision of the rock-dwelling door snail genus Montenegrina Boettger, 1877 (Mollusca, Gastropoda, Clausiliidae), ZooKeys 599, pp. 1-137 : 28-30

Taxon classification Animalia Stylommatophora Clausiliidae

Montenegrina grammica improvisa ssp. n. Fig. 15H

Diagnosis.

Small subspecies with almost smooth shell, dorsolateral to lateral lunella, short, non-connected basalis, and missing anterior plica superior.

Description.

The medium-size, light brownish-corneous shell consists of 9½ to 11 whorls. The surface is smooth at the lower whorls and becomes weakly, indistinctly costate toward the apex. The neck is irregularly and finely wrikled-costate, and behind the aperture densely striate. The basal and peripheral crests are well developed. The peristome is attached, ovoid to somewhat angular, with slightly swollen margin. The lamellae superior and spiralis occasionally overlap. In front view the straight descending end of the lamella inferior is visible, the subcolumellaris is hidden. The lunella is broad, dorsolateral to lateral, separate from the short basalis. The subclaustralis is absent, the sulcalis is residual or also missing. The clausilium plate cannot be viewed through the aperture.

Dimensions

(in mm). Holotype Hs: 14.4, Ws: 3.8, Ha: 3.6, Wa: 2.4; paratypes (HNHM 99019, n = 12): Hs: 12.8-14.4 (mean 13.7, S.D. 0.50), Ws: 3.3-4.2 (mean 3.6, S.D. 0.26), Ha: 3.0-3.6, Wa: 2.0-2.6.

Differential diagnosis.

The new taxon can be distinguished from Montenegrina grammica grammica and Montenegrina grammica erosszoltani by its larger and smoother shell, deep-ending lamella subcolumellaris, deeper lunella, and the presence of a short basalis.

Type locality.

Albania, Mat District, Gropa Mts, 3.5 km W of Gurri i Bardhë, N slope of the Maja e Bastarit, 1160 m, 41.4361°N, 20.0485°E.

Type material.

Type locality, leg. ZF, TN, EM, 15.iv.2014, holotype (HNHM 99518), paratypes (HNHM 99019/29+18a+8aj, NHMW 111234/5, SZ/3).

Etymology.

The name improvisa refers to the unexpected, accidental discovery of the new subspecies.

Distribution.

Gropa Mts in Central Albania. Known only from the type locality (Fig. 17).