taxonID	type	description	language	source
2D4787EDFFD41E1151CA4B8CBDCA3900.taxon	materials_examined	Type species: Unio sinuata Lamarck, 1819 [= Unio auricularius Spengler, 1793]	en	Lyubas, Artem A., Obada, Teodor F., Gofarov, Mikhail Y., Kriauciunas, Vidas V., Vikhrev, Ilya V., Nicoara, Igor N., Bolotov, Ivan N. (2019): A taxonomic revision of fossil freshwater pearl mussels (Bivalvia: Unionoida: Margaritiferidae) from Pliocene and Pleistocene deposits of Southeastern Europe. Ecologica Montenegrina 21: 1-16, DOI: 10.37828/em.2019.21.1, URL: https://www.biotaxa.org/em/article/view/em.2019.21.1
2D4787EDFFD41E1151CA4B8CBDCA3900.taxon	description	Types. Whereabouts unknown.	en	Lyubas, Artem A., Obada, Teodor F., Gofarov, Mikhail Y., Kriauciunas, Vidas V., Vikhrev, Ilya V., Nicoara, Igor N., Bolotov, Ivan N. (2019): A taxonomic revision of fossil freshwater pearl mussels (Bivalvia: Unionoida: Margaritiferidae) from Pliocene and Pleistocene deposits of Southeastern Europe. Ecologica Montenegrina 21: 1-16, DOI: 10.37828/em.2019.21.1, URL: https://www.biotaxa.org/em/article/view/em.2019.21.1
2D4787EDFFD41E1151CA4B8CBDCA3900.taxon	materials_examined	Type strata and locality. Upper Pliocene, Prut River valley near Slobozia Mare village, Danube Basin, Moldova [45.6067 ° N, 28.1656 ° E].	en	Lyubas, Artem A., Obada, Teodor F., Gofarov, Mikhail Y., Kriauciunas, Vidas V., Vikhrev, Ilya V., Nicoara, Igor N., Bolotov, Ivan N. (2019): A taxonomic revision of fossil freshwater pearl mussels (Bivalvia: Unionoida: Margaritiferidae) from Pliocene and Pleistocene deposits of Southeastern Europe. Ecologica Montenegrina 21: 1-16, DOI: 10.37828/em.2019.21.1, URL: https://www.biotaxa.org/em/article/view/em.2019.21.1
2D4787EDFFD41E1151CA4B8CBDCA3900.taxon	diagnosis	Differential diagnosis. This species is conchologically similar to P. auricularius and P. homsensis (Figs. 4 - 8). Moreover, clear conchological features to distinguish the recent Pseudunio taxa from each other are lacking (Araujo et al., 2009; Lopes-Lima et al., 2018). P. flabellatiformis and the recent Pseudunio species clearly differs from P. flabellatus by the lack of strong corrugate plication of the shell, although a weakly developed plication can be found in some specimens (Chepalyga, 1967; Bolotov et al. 2016; Vikhrev et al. 2017; Lopes-Lima et al., 2018). Phylogenetic position. Extinct lineage related to P. auricularius and P. homsensis. We assume that this extinct species was originated in a distinct isolate (Danube and Dniester paleo-basins) simultaneously with the two terminal species (P. auricularius in Southern Europe and P. homsensis in Orontes Basin) since the Middle Miocene. Stratigraphic and geographic range. Late Miocene – Late Pleistocene, Danube and Dniester paleo-basins, Black Sea drainage, Eastern Europe. Paleoenvironment. Available data (Chepalyga, 1964, 1965, 1967; this study) indicates that P. flabellatiformis inhabited the main channels of large rivers with sandy-gravel and sandy-pebble bottom substrate (Fig. 2). It often co-occurred with Unio crassus Retzius, 1788 (or its stem lineages).	en	Lyubas, Artem A., Obada, Teodor F., Gofarov, Mikhail Y., Kriauciunas, Vidas V., Vikhrev, Ilya V., Nicoara, Igor N., Bolotov, Ivan N. (2019): A taxonomic revision of fossil freshwater pearl mussels (Bivalvia: Unionoida: Margaritiferidae) from Pliocene and Pleistocene deposits of Southeastern Europe. Ecologica Montenegrina 21: 1-16, DOI: 10.37828/em.2019.21.1, URL: https://www.biotaxa.org/em/article/view/em.2019.21.1
2D4787EDFFD41E1151CA4B8CBDCA3900.taxon	materials_examined	Type strata and locality. Upper Freshwater Molasse (Middle Miocene), Käpfnach, southern shore of Lake Zürich, Switzerland [approx. 47.2546 ° N, 8.6160 ° E] (Schneider and Prieto, 2011).	en	Lyubas, Artem A., Obada, Teodor F., Gofarov, Mikhail Y., Kriauciunas, Vidas V., Vikhrev, Ilya V., Nicoara, Igor N., Bolotov, Ivan N. (2019): A taxonomic revision of fossil freshwater pearl mussels (Bivalvia: Unionoida: Margaritiferidae) from Pliocene and Pleistocene deposits of Southeastern Europe. Ecologica Montenegrina 21: 1-16, DOI: 10.37828/em.2019.21.1, URL: https://www.biotaxa.org/em/article/view/em.2019.21.1
2D4787EDFFD41E1151CA4B8CBDCA3900.taxon	diagnosis	Differential diagnosis. This species differs from the other Pseudunio taxa by a strong corrugate plication of the shell. Furthermore, it seems to be the most ancient lineage among European Pseudunio (Schneider and Prieto, 2011). Phylogenetic position. This species appears to be a stem lineage and the MRCA of a clade that contains the terminal species P. auricularius and P. homsensis, and the extinct species P. flabellatiformis. Stratigraphic and geographic range. Miocene, Danube Paleo-Basin, Black Sea drainage, Western and Eastern Europe. Paleoenvironment. This species is known from a variety of riverine and lacustrine paleo-environments (Nesemann, 1993; Scholz et al., 2007; Schneider and Prieto, 2011). Taxonomic comments. Schneider and Prieto (2011) provided a full redescription of this taxon with a nearly complete list of synonyms.	en	Lyubas, Artem A., Obada, Teodor F., Gofarov, Mikhail Y., Kriauciunas, Vidas V., Vikhrev, Ilya V., Nicoara, Igor N., Bolotov, Ivan N. (2019): A taxonomic revision of fossil freshwater pearl mussels (Bivalvia: Unionoida: Margaritiferidae) from Pliocene and Pleistocene deposits of Southeastern Europe. Ecologica Montenegrina 21: 1-16, DOI: 10.37828/em.2019.21.1, URL: https://www.biotaxa.org/em/article/view/em.2019.21.1
