Traits name details
original description
(of Planorbis symmetrus Ludwig, 1865 †) Ludwig, R. (1865). Fossile Conchylien aus den tertiären Süsswasser- und Meerwasser-Ablagerungen in Kurhessen, Grossherzogtum Hessen und der Bayer'schen Rhön. <em>Palaeontographica.</em> 14: 40-97., available online at https://www.biodiversitylibrary.org/page/12204687 page(s): 96-97, pl. 21, figs 16-16b [details] 
additional source
Wenz, W. (1923-1930). Fossilium Catalogus I: Animalia. Gastropoda extramarina tertiaria. W. Junk, Berlin. Vol. I: 1-352 pp. (1923), Vol. II: 353-736 pp. (1923), Vol. III: 737-1068 pp. (1923), Vol. IV: 1069-1420 pp. (1923), Vol. V: 1421-1734 pp. (1923), Vol. VI: 1735-1862 pp. (1923), Vol. VII: 1863-2230 pp. (1926), Vol. VIII: 2231-2502 pp. (1928), Vol. IX: 2503-2886 pp. (1929), Vol. X: 2887-3014 pp. (1929), Vol. XI: 3015-3387 pp. (1930)., available online at http://biodiversitylibrary.org/bibliography/61839#/summary page(s): 2478 [details]
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