Tirolonautilus undefined-2

Tirolonautilus sp. 2 Fig. 40 Material examined IRAN – East Azerbaijan • 1 specimen; Ali Bashi 4; Paratirolites Limestone (2.80 m below top) of the Ali Bashi Formation (late Changhsingian); 2011; Korn et al. leg.; illustrated in Fig. 40B; MB.C. 32066. Description Specimen MB.C.32066 is a badly corroded and thus poorly preserved individual with a diameter of 93 mm (Fig. 40B). It can, however, because of its characteristic longitudinal nodes on the venter on both sides of the deep median groove (Fig. 40), be attributed to the genus Tirolonautilus. These nodes extend, at least at the beginning of the last whorl, as low ribs towards the midflank, where they wedge out. Remarks The conch form and sculpture of the specimen from Julfa bears some resemblance to T. sebedinus from the Dolomites (Prinoth & Posenato 2007). However, the ribs on the flank are noticeably sharper in T. sebedinus and extend towards the umbilical margin. Unfortunately, the poor preservation of the specimen from Ali Bashi precludes a more detailed discussion.