Tirolonautilus sp. 2

Korn, Dieter & Ghaderi, Abbas, 2025, Late Permian nautiloids from Julfa (NW Iran), European Journal of Taxonomy 1018, pp. 1-113 : 79-80

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.

Figures

Fig. 40. Tirolonautilus sp. 2, specimen MB.C.32066 (Korn et al. 2011 Coll.) from the Paratirolites Limestone (2.80 m below top) of the Ali Bashi Formation at Ali Bashi 4. A. Lateral view. B. Reconstruction of apertural view. Scale bar units =1 mm.