FIGURE 1. Map of Ukraine with the coastline of Eastern Paratethys (blue line) during the late middle Sarmatian s.l. (according to Popov et al., 2004) (1), enlargered part of the lower reaches of the Pivdennyi Buh River (2), location map of the Mykhailivka quarry (3). The Mykhailivka locality is marked by an asterisk.

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FIGURE 2. Stratigraphical position of the Mykhailivka section. Lithological and paleontological data from Prisyazhniuk et al. (2006). Reconstruction of environmental log deduced from Prisyazhniuk et al. (2006).

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FIGURE 3. Otoliths from the Sarmatian s.l. of the Mykhailivka 1. 1-4, Morone cf. nobilis (Koken, 1891): NMNHU-P 33/1482, inner face (1), ventral view (2); NMNHU-P 33/1483, inner face (3), ventral view (4). 5-8, Genyonemus ? sp . : NMNHU-P 33/1485, inner face (5), ventral view (6); NMNHU-P 33/1512, inner face (7), ventral view (8). 9-18, Ponticola dorsorostralis (Weinfurter, 1954): NMNHU-P 33/1486, inner face (9), ventral view (10); NMNHU-P 33/1487, inner face (11), ventral view (12); NMNHU-P 33/1488, inner face (13), ventral view (14); NMNHU-P 33/1489, inner face (15); NMNHU-P 33/1490, inner face (16); NMNHU-P 33/1491, inner face (17); NMNHU-P 33/1492, inner face (18). Scale bars equal 1 mm. 5-10, 17, 18 are mirrored.

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FIGURE 4. Otoliths from the Sarmatian s.l. of the Mykhailivka 1. 1-9, Neogobius bettinae n. sp.: NMNHU-P 33/1497 (paratype), inner face (1); NMNHU-P 33/1498 (paratype), inner face (2); NMNHU-P 33/1499 (paratype), inner face (3), ventral view (4); NMNHU-P 33/1496 (holotype), inner face (5), ventral view (6); NMNHU-P 33/1500 (paratype), inner face (7), ventral view (8); NMNHU-P 33/1501 (paratype), inner face (9). 10-19, Neogobius rhachis Rückert-Ülkümen, 1993 in Rückert-Ülkümen et al., 1993: NMNHU-P 33/1504, inner face (10), ventral view (11); NMNHU-P 33/1505, inner face (12), ventral view (13); NMNHU-P 33/1506, inner face (14), ventral view (15); NMNHU-P 33/1507, inner face (16), ventral view (17); NMNHU-P 33/1508, inner face (18); NMNHU-P 33/1509, inner face (19). Scale bars equal 1 mm. 5-8, 10, 11, 14, 15, 18 are mirrored.

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FIGURE 5. Recent otoliths of the genus Neogobius. 1-2, Neogobius melanostomus (Pallas, 1814): ZMMU, P.23515 3, SL91, 43°38'N-51°08'E, inner face (1), dorsal view (2). 3-4, Neogobius pallasi (Berg, 1916): ZMMU, P.23514, SL93, 43°28'N-51°18'E., inner face (3), dorsal view (4). 5-6, Neogobius fluviatilis (Pallas, 1814): ZMMU, P.22433, SL81, 45°20'N-28°57'E, inner face (5), dorsal view (6). 7-9, Neogobius caspius (Eichwald, 1831): 7-8, ZMMU, P.22622 1, SL90, 51°25'N-46°03'E, inner face (7), dorsal view (8); 9, ZMMU, P.22622 2, SL105, 51°25'N-46°03'E, inner face.

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