FIGURE 1. Geographic overview of the study area, with indication of sampling points and places mentioned in the text (modified from Wesselingh et al. 2019). Note that the GPS coordinates of locality 22 are uncertain (see Material and Methods section for details), localities 25 and 33 contain six close-by coring localities each and locality 30 contains four close-by sampling points (see Table 1 for details).

Published as part of Anistratenko, Vitaliy V., Neubauer, Thomas A., Anistratenko, Olga Yu., Kijashko, Pavel V. & Wesselingh, Frank P., 2021, A revision of the Pontocaspian gastropods of the subfamily Caspiinae (Caenogastropoda: Hydrobiidae), pp. 151-197 in Zootaxa 4933 (2) on page 153, DOI: 10.11646/zootaxa.4933.2.1, http://zenodo.org/record/4550146