Serometacoceras incertum ( Abich, 1878 ), 2025

Korn, Dieter & Ghaderi, Abbas, 2025, Late Permian nautiloids from Julfa (NW Iran), European Journal of Taxonomy 1018, pp. 1-113 : 47

Serometacoceras incertum ( Abich, 1878) gen. et comb. nov.

Fig. 3D

Nautilus incertus Abich, 1878 : pl. 4 fig. 3.

Pleuronautilus ( Pleuronautilus) incertus – Kummel 1953: 36.

? Pleuronautilus incertus – Shimansky 1965b: pl. 15 fig. 3.

Remarks

Abich (1878: pl. 4 fig. 3) illustrated a small fragment with about 15 mm whorl width in ventral view ( Fig. 3D ). He called this specimen “ Nautilus incertus ” in the table explanation, but he described it ( Abich 1878: 21) only as the second specimen of “ Nautilus Pichleri ” ( Fig. 3E ). The specimen possesses a flattened venter and bears ventrolateral nodes. A species definition can probably not be based on this specimen. It is not even clear whether Abich had any taxonomic naming of the specimen in mind at all; von Arthaber (1900: 216) already suspected that the term “ incertus ” should only mean “indeterminable”.

For this reason, but also because of the small size of Abich’s specimen, a clear species description is not possible. It is also not clear whether the much larger specimen shown by Shimansky (1965b: pl. 15 fig. 3) can be classified as “ incertus ”. The species can therefore only be included with reservations.

Figures

Fig. 3. Reproductions of nautiloid figures of Abich (1878). A. “Nautilus dorso plicatus” Abich, 1878. B. “Nautilus dorso plicatus”. C. “Nautilus dorso armatus” Abich, 1878. D. “Nautilus incertus” von Arthaber, 1900. E. “Nautilus Pichleri” von Arthaber, 1900. F. “Nautilus tubercularis” Abich, 1878. Scale bar units =1 mm.