Family Xenodiscidae Frech, 1902 Diagnosis Representatives of the superfamily Xenodiscoidea with a small to moderately large conch, in which the ontogeny displays up to three stages, beginning with an unsculptured initial stage followed by a juvenile stage with transverse ribs, and an adult stage with a weakening of the sculpture. Suture line with unserrated or weakly serrated, short but rather wide external lobe; adventive, lateral and umbilical lobe often multidentate; some species with a simplified suture line without serrations. Included Permian genera Iranites Teichert & Kummel, 1973; Laibinoceras Yang, 1987; Multisulcites Liang, 1983; Paraceltitoides Zheng & Chen, 1979; Penglaites Yang, 1987; Phisonites Shevyrev, 1965; Shevyrevites Teichert & Kummel in Teichert et al., 1973; Xenodiscus Waagen, 1879.

Published as part of Korn, Dieter, Hairapetian, Vachik, Ghaderi, Abbas, Leda, Lucyna, Schobben, Martin & Akbari, Amir, 2021, The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran), pp. 1-106 in European Journal of Taxonomy 776 on page 18, DOI: 10.5852/ejt.2021.776.1559, http://zenodo.org/record/5604715