Hydrobia elongata (Eichwald, 1830)

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 : 9

Hydrobia elongata (Eichwald, 1830)

Figure 4.4 , Figure 7.3

1830 Rissoa elongata : Eichwald, p. 218.

1850 Rissoa elongata Eichwald ; Eichwald, p. 131, pl. 10, fig 15.

1853 Rissoa elongata Eichwald ; p. 272, pl. 10, fig. 15.

non 1853 Litorinella acuta Eichwald , p. 292 (syn. Bulimis elongatus magontianus Faujas de St. Fond: p. 376, pl. 58, fig. 5-8).

1856 Paludina frauenfeldi Hörnes , p. 582, pl. 47, fig. 18.

1935 Hydrobia elongata (Eichwald) ; Kolesnikov, p. 214-215, pl. 27, figs. 18-21.

Material. 78 specimens from layer 1 and 1 specimens from layer 3.

Description. Shell high conical, with a pointy apex (HS is up to 7.0 mm; WS is up to 3.9 mm). WS/HS is 0.45-0.55, consisting of 6-7 convex whorls separated by a slightly sloping moderately deep suture. The last whorl is rounded and is about 0.5-0.6 of the shell height (HLW/HS). Aperture is oval, oblique, pointed in the upper part (WA/HA 0.65), and is approximately 1/3 of the total shell height (HA/HS 0.3). Aperture edges are thin, not thickened. Umbilicus is slit-like, covered by the inner edge of aperture. The shell surface is smooth; growth lines are visible.

Remarks. Hörnes (1856) proposed a new name for Rissoa elongata (Eichwald, 1853, p. 272, pl. 10, fig. 15) as Paludina fraunfeldi , due to the fact that the name elongata for genus Paludina was already used by Sowerby (Hörnes, 1856). Kolesnikov (1935) restored the name given by Eichwald (1830).

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).