Costimitoceras Vohringer 1960

Genus Costimitoceras Vöhringer, 1960 Type species Costimitoceras ornatum Vöhringer, 1960: 148; original designation. Genus diagnosis Genus of the Acutimitoceratinae with a discoidal conch and moderately high to high coiling rate (WER = 1.90–2.20); inner whorls evolute. Ornament with biconvex growth lines and spiral lines. Suture line with deep external lobe. Genus composition Central Europe (Vöhringer 1960): Costimitoceras ornatum Vöhringer, 1960. North Africa(Ebbighausen & Bockwinkel 2007): Costimitoceras aitouamar Ebbighausen& Bockwinkel, 2007. South China (Ruan 1981): Imitoceras (Costimitoceras) epichare Ruan, 1981. Remarks Costimitoceras can be easily distinguished from all other prionoceratids due to the very striking combination of coarse growth lines and spiral lines.Published as part of Korn, Dieter & Weyer, Dieter, 2023, The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany), pp. 1-230 in European Journal of Taxonomy 882 on page 90, DOI: 10.5852/ejt.2023.882.2177, http://zenodo.org/record/817758