Ecrobia sp., 1865

Neubauer, Thomas A. & Wesselingh, Frank P., 2023, The Early Pleistocene freshwater mollusks of the Denizli Basin (Turkey): a new long-lived lake fauna at the crossroads of Pontocaspian and Aegean-Anatolian realms, Zitteliana 97, pp. 53-88 : 53

Ecrobia sp.

Fig. 8A-F, Q

Material.

1 specimen (RGM 962612), 4 specimens (RGM 1310850), 1 specimen SNSB-BSPG 2023 XII 6); all from sample 2.

Dimensions.

5.54 × 3.55 mm (RGM 962612; Fig. 8A-C, Q ), 4.61 × 3.01 mm (SNSB-BSPG 2023 XII 6, Fig. 8D-F ).

Remarks.

The shape of the shell and the aperture and the type of growth lines are typical of the genus Ecrobia . The protoconch includes ~1.1 whorls and appears to be smooth (the preservation of the apex is, however, rather poor). The P/T boundary is marked by the onset of growth lines. Shape-wise our specimens fall well into the morphological range of extant E. grimmi (Clessin in Dybowski, 1887) from the Caspian Sea, but it also resembles stout forms of the widespread European E. ventrosa (Montagu, 1803) and the Black Sea/eastern Mediterranean species E. maritima (Milaschewitsch, 1916). Only, our material is exceptionally large for Ecrobia and has a slightly thickened aperture, which is untypical as well. It might well represent an undescribed species, but since Ecrobia species are known to be extremely variable ( Kantor and Sysoev 2006; Neubauer et al. 2018; Vandendorpe et al. 2019) and we have only limited material available for comparison, we refrain from introducing a new species.

Figures

Figure 8. Hydrobiinae (Hydrobiidae) of the Kolankaya I fauna. A-C, Q. Ecrobia sp. RGM 962612, sample 2. D-F. Ecrobia sp. SNSB-BSPG 2023 XII 6, sample 2. G-I. P. Harzhauseria schizopleura gen. et sp. nov., holotype, RGM 962613, sample 2. J-L. Harzhauseria schizopleura gen. et sp. nov., paratype, RGM 962614, sample 2. M-O, R-T. Hydrobiinae sp. indet., RGM 1365350, sample 1. Scale bars: 1 mm (A-O); 100 μm (P-T).