Deroceras sp.

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 : 18

? Deroceras sp.

Figure 6.4-5

Material. 344 specimens from layer 3.

Description. Oval-oblong vestigial shell (LS is 4.6- 6.1 mm, 5.2 in average; WS is 2.5-3.0 mm, 2.9 in average; WS/HS is 0.52-0.6, 0.55 in average), thin, apex shifted to the flank. Edges are uneven. Growth lines are visible on the dorsal side; sculpture on the lower side is absent.

Variability. Appears in an oval to a round-rectangular form of a plate ( Figure 6.4-5 ), apex position, and peculiarities of a growth line position.

Remarks. Fossil slug shells found in the Miocene, Pliocene and Pleistocene undoubtedly belong to different species and most likely to different genera. Since the modern classification is based on the features of the soft body, identification of fossil slugs is generally unreliable (Likharev and Wiktor, 1980). Steklov (1966) conditionally referred slug shells to the genus Limax .

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.