Gibbula podolica (Du Bois de Montpéreux, 1831)

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 : 7

Gibbula podolica (Du Bois de Montpéreux, 1831)

Figure 4.10 , Figure 7.5

1831 Trochus podolicus Du Bois de Montpéreux , p. 42, pl. 3, figs. 1-3.

1850 Trochus podolicus Du Bois de Montpéreux ; Eichwald, p. 110, pl. 9, fig. 35.

1935 Trochus podolicus Du Bois de Montpéreux ; Kolesnikov, p. 180-182, pl. 24, figs. 7-9.

2017 Gibbula (Sarmatigibbula) podolica (Du Bois de Montpéreux) ; Sladkovskaya, p.

1542-1543, pl. 5, figs. 12-21.

Material. 47 specimens from layer 1 and 8 specimens from layer 3.

Description. The shell is conical with a sharp spire (HS is up to 30 mm; WS is up to 25 mm), moderately high (WS/HS is 0.9-1.1), consists of eight flat whorls separated by almost horizontal surface suture. Very narrow flat areas are visible near suture. The last whorl is 0.7-0.8 of the height of the shell (HLW/HS). Aperture is rounded, pointed in the upper part (WA/HA is 0.8-1.0), and is approximately 0.45-0.55 of the total shell height (HA/HS). The outer edge of aperture is thin; the inner one is thickened. Umbilicus is slit-like and can be completely covered by the inner edge of aperture.

The shell surface sculpture appears after the protoconch and consists of wide box-shaped spiral ribs (usually four on each whorl). The upper and lower ribs on each whorl are more developed than the two middle ribs. The lower rib forms a keel with tubercles along the periphery of the last whorl. The base of the shell is slightly convex and covered with spiral ribs (usually 5). Between the ribs, both on the spire and adumbilical, thin spiral threads often present. Strong growth lines are visible as well.

Region of distribution and age. Early and Middle Sarmatian of the Central and Eastern Paratethys (O. Anistratenko and V. Anistratenko, 2012).

Figures

FIGURE 4. Assemblage of the Middle Sarmatian (Bessarabian) marine gastropods (layers 1 and 2). 1, Acteocina lajonkaireana (Basterot, 1825). 2, Acteocina okeni (Eichwald, 1850). 3, Retusa melitopolitana (Sokolov, 1899). 4, Hydrobia elongata Eichwald, 1830. 5, Pseudamnicola nympha (Eichwald, 1850). 6, Dorsanum duplicata opinabile (Kolesnikov, 1932). 7, Dorsanum corbiana (d’Orbigny, 1844). 8, Dorsanum ignobile (Kolesnikov, 1932). 9, Gibbula (Gibbula) pseudoangulata (Sinzov, 1875). 10, Gibbula (Sarmatigibbula) podolica (Du Bois de Montpéreux, 1831).

FIGURE 7. Assemblage of the redeposited Miocene marine and terrestrial molluscs. 1, Vertigo sp. 2, Hydrobia enikalensis Kolesnikov, 1935. 3, Hydrobia elongata Eichwald, 1830. 4, Gibbula sp. 5, Gibbula (Sarmatigibbula) podolica (Du Bois de Montpéreux, 1831). 6, Gibbula sp. 7, Acteocina lajonkaireana (Basterot, 1825).