Reconstruction of Oligocene and Neogene freshwater fish faunas-an actualistic study on cypriniform otoliths Author Schulz-Mirbach, Tanja Author Reichenbacher, Bettina text Acta Palaeontologica Polonica 2006 51 2 283 304 journal article 10.5281/zenodo.13643922 1732-2421 13643922 Rutilus rutilus ( Linnaeus, 1758 ) Fig. 18 . Material and dimensions .—See Table 2 . Description .—The general shape is trapezoid in the posterior portion and more elongated and rounded in the anterior portion. The anteromedial edge is rounded or slightly pointed and well developed. The posteromedial and −lateral edges are angular and thus more prominent. The most prominent edge is the anterolateral one, which is a strong projection of the lateral margin. The medial margin is variable and may be rounded ( Fig. 18A ), straight ( Fig. 18I, J ), concave ( Fig. 18B ), or crenulated ( Fig. 18C, D ). The posterior margin is generally straight and undulated. The lateral margin is also straight but more or less smooth.