Bythinella corrosa, Glöer & Hirschfelder, 2020

Glöer, Peter & Hirschfelder, Hans-Jürgen, 2020, Some new Bythinella spp. from southern Greece (Gastropoda: Bythinellidae), Ecologica Montenegrina 30, pp. 60-67 : 66

Bythinella corrosa n. sp. [ fig. 4 ]

Type locality: Greece, Arcadia , Astros , spring 2.7 km south of Astros , below the main road to Leonidio on the bank of Limni Moustou, N 37°23'06.2'' / E 22°44'36.5'', 1 m a.s.l., 01.05.2017, leg. Hans-Jürgen & Andrea Hirschfelder.

Type Material: Holotype ( ZMH 140692 ): Shell height 2.6 mm, shell width 1.5 mm . Paratypes from type locality: ZMH (140693/2), coll. Hirschfelder (5 adult, 23 subadult) .

Etymology: The new species is named after the always corroded shell.

Description:

Shell: The shell is conical with the uppermost part of the embryonic whorl erected and detached. In some specimens two or more whorls are detached with a corkscrew-like appearance. The first whorls are more or less strongly corroded. The aperture is ovate, with a sharp peristome. The umbilicus is closed. The shell is 1.8-2.6 mm high and 1.3-1.5 mm broad and has about 3-3.5 whorls.

Differentiating characters: No other Greek species shows an erected apex and partly detached whorls. B. beckmanni with the same size is much more slender and cylindrical.

Distribution: Only known from type locality at the shore of Limni Moustou.

Remarks: All specimens are strongly corroded and more or less deformed. Out of more than 30 investigated specimens no one showed a “normal” shape. The reason is unknown and could be due to parasitism or chemical influences. This species is the only one in Greece that lives at sea level.

Figures

Figure 4. Bythinella corrosa n. sp. 1: Holotype, 2-4: paratypes.