Helicodiscus (Helicodiscus) roemeri (Andreae, 1902)

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

Helicodiscus (Helicodiscus) roemeri (Andreae, 1902)

Figure 6.2

1830 Helix depressa Eichwald , p. 215.

1853 Helix depressa Eichwald ; Eichwald, p. 300- 301, pl. 11, fig. 10 a-d.

1902 Hyalinia (Gyralina) roemeri Andreae , p. 8- 9, fig. 3.

1942 Gyralina roemeri (Andreae) ; Wenz and Edlauer, p. 93, pl. 4, fig. 12.

1972 Helicodiscus eichwaldi Prisyazhnyuk , p.

132, fig. A.

1978 Helicodiscus eichwaldi Prisyazhnyuk ; Gozhyk, Prisyazhnyuk, p. 85, pl. 11, figs. 6- 8.

1978 Helicodiscus (Helicodiscus) roemeri (Andreae) ; Schlickum, p. 69, fig. 3.

1986 Helicodiscus depressa (Eichwald) ; Roshka, p. 40, pl. 1, figs. 10-11.

1997 Helicodiscus (Helicodiscus) depressus (Eichwald) ; Stworzewicz and Prisyazhnyuk, p. 197-204, figs. 1-4.

2013 Helicodiscus (Helicodiscus) roemeri (Andreae) ; Stworzewicz, Prisyazhnyuk and Górka, p. 193-194, fig. 5G.

2015 Helicodiscus (Helicodiscus) roemeri (Andreae) ; Harzhauser, Neubauer, Georgopoulou, Esu, D‘Amico, Pavia, Giuntelli and Carnevale, p. 36, 38, pl. 5, figs. 10-12.

2018 Helicodiscus (Helicodiscus) roemeri (Andreae) ; Harzhauser and Neubauer, p.

110-111, fig. 10A, B.

Material. 9 specimens from layer 3.

Description. Planispiral shell (HS is 0.85-1.95

mm, average 1.2; WS is 1.7-2.5 mm, average 2.1;

WS/HS is 3), consists of 3.5-4 rounded whorls,

evenly increases in width, convex, covered with longitudinal threads. Suture is deep. Umbilicus is wide and shallow. Aperture is semicircular carved by the last whorl and slightly drawn down, edges are thin (HA is 0.8 mm; WA is 1.0 mm); the teeth are absent.

Remarks. Nomenclatorial issues discussed by

Stworzewicz et al. (2013) and Harzhauzer et al.

(2015).

Region of distribution and age. Middle – Late

Miocene (Volhynian to Pannonian/Messinian).

Central, Southern and Eastern Europe

(Stworzewicz et al., 2013; Harzhauser et al., 2015).

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.