Permodomatoceras Ruzhencev & Shimansky, 1954

Korn, Dieter & Ghaderi, Abbas, 2025, Late Permian nautiloids from Julfa (NW Iran), European Journal of Taxonomy 1018, pp. 1-113 : 19

Genus Permodomatoceras Ruzhencev & Shimansky, 1954

Type species

Permodomatoceras trapezoidale Ruzhencev & Shimansky, 1954 ; original designation.

Diagnosis

Genus of the family Domatoceratidae with a subinvolute to subevolute conch. High to extremely high coiling rate; whorl profile weakly compressed or weakly depressed. Venter flattened or weakly concave, flanks usually flattened and slightly convergent; umbilical margin rounded or angular. Without sculpture. Suture line with small and shallow external lobe and broadly rounded lateral lobe; without annular process.

Included species

South Urals ( Kruglov 1928; Ruzhencev & Shimansky 1954; Barskov et al. 2014): Domatoceras Fredericksi Kruglov, 1928 , Artinskian, South Urals; Permodomatoceras trapezoidale Ruzhencev & Shimansky, 1954 , Artinskian; Permodomatoceras permianum Barskov & Shilovsky in Barskov et al., 2014, Roadian; Permodomatoceras marielense Barskov & Shilovsky in Barskov et al., 2014, Roadian.

Transcaucasia (this paper): Permodomatoceras hamdii sp. nov., Wuchiapingian, NW Iran.

Himalayas ( Diener 1903): Nautilus hunicus Diener, 1903 , Wuchiapingian.

Timor ( Haniel 1915): Discites Arthaberi Haniel, 1915, Kungurian.

Remarks

According to Ruzhencev & Shimansky (1954: 95), Permodomatoceras is distinguished from Domatoceras by its more angular and lower whorls; the ratio of whorl width to height is between 0.90 and 1.10 in Permodomatoceras and only about 0.70 in Domatoceras . In addition, the external lobe is less well developed in Permodomatoceras . Permodomatoceras is thought to be closer to the American genera Penascoceras and Parapenascoceras in terms of whorl profile, but is clearly distinguished from them by a greater amplitude of suture elements and longer chambers.