Anisus cf. spirorbis (Linnaeus, 1758)

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 : 15-16

Anisus cf. spirorbis (Linnaeus, 1758)

Figure 8.3

1758 Helix spirorbis, Linnaeus , p. 770.

1885 Planorbis spirorbis (Linnaeus) ; Westerlund, p. 73.

1952 Anisus spirorbis (Linnaeus) ; Zhadin, p.

185, fig. 90.

1955 Paraspira spirorbis (Linnaeus) ; Danilovskiy, p. 105, pl. 10, figs. 286-288.

1960 Paraspira spirorbis (Linnaeus) ; Kirillina, p.

151, pl. 8, figs. 97-98.

1964 Anisus spirorbis (Linnaeus) ; Ložek, p. 183, fig. 33.

1977 Anisus spirorbis (Linnaeus) ; Starobogatov, p. 170, fig. 405.

1998 Anisus spirorbis : Gittenberger, Janssen, Kuijper, Kuiper, Meijer, Velde and Vries, p.

147, figs. 297-299.

2002 Anisus (Anisus) spirorbis (Linnaeus) ; Glöer, p. 256, add. 278.

2007 Anisus spirorbis (Linnaeus) ; Sanko, p. 110, fig. 88.

Material. 3 specimens from layer 3.

Description. Planispiral shell (HS is 0.8 mm; WS

is 2.4 mm; WS/HS is 3), dented evenly from the upper and lower sides. There are 5-6 rounded whorls, slowly growing, convex, covered with longitudinal hatching. Suture is deep. The last whorl is

1.5 times wider than the penultimate one. Shell is flattened at the bottom, and a keel is observed along the periphery of the lower edge. Aperture is rounded, with a lip inside. The upper edge of aperture is extended forward.

Remarks. Preservation of shells is in a form of internal casts suggesting redeposition.

Region of distribution and age. Pleistocene – Present. European part of Russia, Asia, Europe (Glöer, 2002). Late Miocene of the the northeastern Azov Sea region.

Figures

FIGURE 8. Assemblage of the redeposited Miocene marine and terrestrial molluscs. 1, Dorsanum sp. 2, Gibbula (Gibbula) pseudoangulata (Sinzov, 1875). 3, Anisus cf. spirorbis (Linnaeus, 1758). 4, Blinia cf. angulata (d’Orbigny, 1844). 5, Cardiidae indet. (cf. Obsoletiformes). 6, Cardiidae indet. 7, Barbotella intermedia (Radovanović et Pavlović, 1893).