Revision of Saurorhynchus (Actinopterygii: Saurichthyidae) from the Early Jurassic of England and Germany Author Maxwell, Erin E. B2704A50-D2A0-4592-8F8E-DB02E7D99256 Staatliches Museum für Naturkunde Stuttgart, Rosenstein 1, 70191 Stuttgart, Germany. Institut für Geographie und Geologie, Ernst-Moritz-Arndt-Universität Greifswald, Friedrich-Ludwig-Jahn Strasse 17 a, 17489 Greifswald, Germany. erin.maxwell@smns-bw.de Author Stumpf, Sebastian 8DADF851-CFA5-469E-9628-AD020803B424 Email: sebastian. stumpf @ stud. uni-greifswald. de & urn: lsid: zoobank. org: author: 8 DADF 851 - CFA 5 - 469 E- 9628 - AD 020803 B 424 sebastian.stumpf@stud.uni-greifswald.de text European Journal of Taxonomy 2017 2017-05-23 321 321 1 29 journal article 22100 10.5852/ejt.2017.321 caeead37-b6ce-4f03-96d2-ae8c8beb8573 2118-9773 3829282 490DE895-000D-4995-9FAC-1F50DEB0DD0F Saurorhynchus sp. Material studied GERMANY : Numismalismergel jaw ( SMNS 96082). Remark SMNS 96082 is the only Pliensbachian record of Saurorhynchus of which we are aware. Although clearly referable to Saurorhynchus , SMNS 96082 is distinct from S. anningae sp. nov. in the shape of the posterior mandible and position of the mandibular sensory canal, and also from S. brevirostris , in that the posterior edge of the mandible is more strongly sinusoidal. However, there are few features to differentiate SMNS 96082 from the Toarcian-aged S. acutus and S. hauffi sp. nov. One notable difference is the development of plicidentine, which is easily visible around all tooth bases in this specimen. In Toarcian saurichthyids, plicidentine, while present at least some of the time, does not appear to be as well-developed or consistently present. However, body size/absolute tooth size may be playing a role: with a mandibular depth of 23 mm , the Numismalismergel jaw ranks among the largest Saurorhynchus skulls from southwestern Germany (Suppl. Table 1; Hauff 1938 ). As in the Toarcian material, the collar region of the teeth does not appear to be corrugated. Comparing the jaw depth to other Toarcian Saurorhynchus skulls, a skull length of between 114 mm (based on PMU 30009) and 143 mm ( Hauff 1938 ) is predicted, which would result in an estimated fork length of 40–50 cm .