Vallonia cf. pulchella (Müller, 1774)

Frolov, Pavel D., Danukalova, Guzel A. & Osipova, Eugenia M., 2018, Late Miocene molluscs of the Morskaya 2 site (Azov Sea region, Russia), Palaeontologia Electronica (a 20) 23 (1), pp. 1-32 : 16-17

Vallonia cf. pulchella (Müller, 1774)

Figure 6.3

1774 Helix pulchella Müller , p. 30.

1952 Vallonia pulchella (Müller) ; Likharev, Rammelmeyer, p. 164, fig. 77а.

1955 Vallonia pulchella (Müller) ; Danilovskiy, p. 88, pl. 6, figs. 117-118.

1960 Vallonia pulchella (Müller) ; Kirillina, p. 151, pl. 3, figs. 35-37.

1964 Vallonia pulchella (Müller) ; Ložek, p. 221, pl. 10/5abc.

PALAEO- ELECTRONICA.ORG

Material. 1 specimen from layer 3.

Description. Low-conical shell (HS is 1.0 mm; WS is 2.25 mm; WS/HS is 2.25) consisting of 3.5 rounded whorls. The last whorl is twice wider as the penultimate one, but not lowered. Suture is deep. Aperture is rounded, edges are slightly outward with a thick white lip (HS is 0.75 mm; WS is 1 mm). Umbilicus is rounded and it slightly widens near the last whorl. Unevenly thin threads striate the shell surface.

Comparison. It differs from Vallonia costata (Müller) in the morphology of the last whorl and aperture. Ribs on whorls are absent.

Region of distribution and age. Late Pliocene – Present. Europe, Asia (Danilovskiy, 1955).

Figures

FIGURE 6. Assemblage of the Maeotian terrestrial molluscs (layer 3). 1, cf. Helicella sp. 2, Helicodiscus (Helicodis- cus) roemeri (Andreae, 1902). 3, Vallonia cf. pulchella (Müller, 1774). 4-5,? Deroceras sp.