Tardunautilus Korn & Ghaderi, 2025

Korn, Dieter & Hairapetian, Vachik, 2025, Late Permian nautiloids from Baghuk Mountain (Central Iran), European Journal of Taxonomy 1019, pp. 1-76 : 36

publication ID

https://doi.org/10.5852/ejt.2025.1019.3071

publication LSID

lsid:zoobank.org:pub:E24EBF4A-9FE2-47E4-A656-E1698F88BB41

DOI

https://doi.org/10.5281/zenodo.17227719

persistent identifier

https://treatment.plazi.org/id/03E487D4-FFF8-4923-FDD4-5D3886B6F875

treatment provided by

Plazi

scientific name

Tardunautilus Korn & Ghaderi, 2025
status

 

Genus Tardunautilus Korn & Ghaderi, 2025

Diagnosis

Genus of the family Foordiceratidae with evolute conch; whorl profile rounded triangular or rounded trapezoidal, depressed with broadly rounded venter. Sculpture with one or two rows of conical ribs near the ventrolateral shoulder. Suture line with very shallow external lobe and broadly rounded lateral lobe; without annular process (from Korn & Ghaderi 2025).

Type species

Tardunautilus nimius Korn & Ghaderi, 2025 ; by original designation.

Included species

NW Iran ( Korn & Ghaderi 2025): Tardunautilus nimius Korn & Ghaderi, 2025 , Wuchiapingian; Tardunautilus minor Korn & Ghaderi, 2025 , Wuchiapingian.

Central Iran (this paper): Tardunautilus aperimos sp. nov., Wuchiapingian.

Remarks

The new genus can be easily distinguished from all other genera in the assemblage from Baghuk Mountain because of its combination of a conch shape with a wide umbilicus, a rounded triangular or rounded trapezoidal whorl profile and a sculpture consisting of conical nodes. A genus with a similar morphology is Pseudotemnocheilus , but this is mostly known from much smaller specimens of about 40–60 mm in diameter. These smaller specimens have a much narrower umbilicus (uw/dm ~0.40) compared to Tardunautilus (uw/dm ~ 0.47) and a less depressed whorl profile (ww/wh ~ 1.30) than Tardunautilus (ww/wh ~1.40–1.80). The coiling rate is much lower in Tardunautilus (WER below 2.00) when compared to Pseudotemnocheilus (WER greater than 2.25).

Kingdom

Animalia

Phylum

Mollusca

Class

Cephalopoda

SubClass

Nautiloidea

Order

Nautilida

SubOrder

Tainoceratina

SuperFamily

Pleuronautiloidea

Family

Rhiphaeoceratidae

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