Bythinella magdalenae Yildirim , Kebapci & Bahadir Koca

Yildirim, Mehmet Zeki, Kebapci, Uemit, Koca, Seval Bahadir & Yuece, Arzu, 2015, New Bythinella (Gastropoda, Bythinellidae) species from western Turkey, ZooKeys 481, pp. 1-13 : 6

Taxon classification Animalia Littorinimorpha Bythinellidae

Bythinella magdalenae Yildirim, Kebapci & Bahadir Koca sp. n. Figs 4, 6c

Holotype

(Coll. Yıldırım): SH 2,5 mm, SW 1,62 mm, ah 1,12 mm, aw 1,06 mm; TURKEY, Aydın, İncirliova, Karagözler Village, Karapınar spring above the village, 37°57,796'N, 27°49,375'E, leg. S. Bahadır Koca. Paratypes: 17 ex in Coll. Yıldırım, same data and locality as holotype; 18 ex in Coll. Yıldırım, TURKEY, Aydın, İncirliova, Karagözler Village, Çaycuk spring above the village, 37°57,829'N, 27°49,230'E, leg. S. Bahadır Koca.

Type locality.

Karapınar Spring, Karagözler Village, İncirliova, Aydın.

Etymology.

Named after the late Polish malacologist Magdalena Szarowska (1952-2013), who contributed greatly especially to the knowledge of the Balkan Truncatelloidea.

Description.

Shell ovate-conical and with 3-3,5 whorls. Apex truncated. Last whorl slowly increasing and broader than previous whorls, sutures not deep and periphery nearly flat. Aperture roundish oval. Umbilicus small, hollow shaped and covered by the lip. Operculum nucleus along left margin, oval shaped and with distinct growth lines.

Head having little amount of pigmentation, rather concentrated on the tips of the tentacles and around the mouth. Tentacles slightly longer than snout. Penis unpigmented, tapering towards the tip, tip not very pointed at its distal end, club-shaped. Tubular gland externally visible, thin, elongated and convoluted. Bursa copulatrix narrow and elongated, rs1 globular in shape. Central tooth of radula with 9 pointed cusps, 1 median and 4 each on sides; lateral margin without any cusps, but undulated.

Measurements: Karapınar Spring (n=18): SH: 2.55 mm (min 2.19/max 2.91), SW: 1.64 mm (min 1.37/max 1.78), SH/SW: 1.55 (min 1.42/max 1.72), SW/SH: 0.65 (min 0.58/max 0.70), ah/SH: 0.45 (min 0.44/max 0.46). Çaycuk Spring (n=18): SH: 2.41 mm (min 2.06/max 2.78), SW: 1.59 mm (min 1.31/max 1.87), SH/SW: 1.52 (min 1.37/max 1.66), SW/SH: 0.66 (min 0.64/max 0.67), ah/SH: 0.46 (min 0.46/max 0.48).

Differential diagnosis.

Bythinella magdalenae sp. n. is distinguished from Bythinella cosensis Schütt 1980 (from Kos island) by the smaller number of shell whorls and the differing number of cusps on the central tooth of radula. It can be distinguished from other Turkish congeners by the flat periphery of the whorls and shallow sutures.

Habitat.

Specimens were collected from two small, closely proximal seepage springs.

Remarks.

Çaycuk Spring is very close to the type locality, thus indeed Bythinella magdalenae sp. n. can be considered a single spot endemic as in the case of other species known from Turkey.