Permodomatoceras Ruzhencev & Shimansky 1954

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.