The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran) Author Korn, Dieter 286CA4F3-7EBC-4AEF-A66A-B2508D001367 Museum für Naturkunde, Leibniz Institut for Research on Evolution and Biodiversity, Invalidenstrasse 43, 10115 Berlin, Germany. dieter.korn@mfn.berlin Author Hairapetian, Vachik 1AB10F8F-4576-481B-9270-5DCD25110DBB Department of Geology, Esfahan (Khorasgan) Branch, Islamic Azad University, Esfahan, Iran. vhairap@gmail.com Author Ghaderi, Abbas 925F2B42-7326-4461-B2A6-83CB83ECCC63 Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Azadi Square, 9177948974, Mashhad, Iran. aghaderi@um.ac.ir Author Leda, Lucyna 81481AFA-C8EE-4E90-A954-FD0E7987621E Museum für Naturkunde, Leibniz Institut for Research on Evolution and Biodiversity, Invalidenstrasse 43, 10115 Berlin, Germany. lucyna.skorpion3@wp.pl Author Schobben, Martin 44C2A45A-B16C-434F-8F22-FC9C0FCA2551 Utrecht University, Department of Earth Sciences, Princetonlaan 8 A, 3584 CB Utrecht, The Netherlands. & Department of Geology, Esfahan (Khorasgan) Branch, Islamic Azad University, Esfahan, Iran. schobbenmartin@gmail.com Author Akbari, Amir 3C9DB6F9-2034-418F-876C-49359D07D29F Department of Geology, Esfahan (Khorasgan) Branch, Islamic Azad University, Esfahan, Iran amakbari80@yahoo.com text European Journal of Taxonomy 2021 2021-10-27 776 1 106 journal article 3782 10.5852/ejt.2021.776.1559 453c885c-f427-4a38-ab97-dc14b686e126 2118-9773 5604715 226B6C59-8620-4A29-9BEF-359BE67A1A2C Pseudogastrioceras relicuum Korn & Ghaderi in Korn et al. , 2016 Fig. 16 ; Table 1 Pseudogastrioceras relicuum Korn & Ghaderi in Korn et al. , 2016: 852 , text-fig. 12. Table 1. Conch dimensions (partly estimated) and ratios of a specimen of Pseudogastrioceras relicuum Korn & Ghaderi in Korn et al. , 2016 from Baghuk Mountain.

Specimen	dm	ww	wh	uw	ah	ww/dm	ww/wh	uw/dm	WER	IZR
MB.C.29661	57.4	–	28.1	5.3	16.8	–	–	0.09	2.00	0.40
41.5	18.5	21.3	3.1	–	0.45	0.87	0.07	–	–

Diagnosis Pseudogastrioceras with moderately large conch; diameter attaining 70 mm . Conch shape thinly discoidal (ww/dm=0.40–0.45), involute (uw/dm = 0.05–0.10) with converging flanks and broadly rounded venter. Ornament with about 15 faint spiral lines on the venter. Material examined Holotype IRAN • East Azerbaijan , Ali Bashi N section ; Paratirolites Limestone ; illustrated by Korn & Ghaderi in Korn et al. (2016 : text-fig. 12); MB.C.25173 . Additional material IRAN • 2 specimens ; Esfahan Province , Baghuk Mountain 1 section; Hambast Formation ; MB.C.29659 to MB.C.29660 • 1 specimen ; Esfahan Province , Baghuk Mountain G section ; Hambast Formation ; MB.C.29661 • 2 specimens ; Esfahan Province , Baghuk Mountain H section ; Hambast Formation ; MB.C.29662 to MB.C.29663 . Description All specimens are rather poorly preserved, but MB.C.29661 is the best of them, though somewhat deformed ( Fig. 16 ). It is a corroded specimen with a 56 mm conch diameter, which does not allow accurate measurements of the conch. Stratigraphic range Paratirolites Limestone ; 6.80 to 3.30 m below the extinction horizon ( Dzhulfites nodosus Zone to Paratirolites lanceolobatus Zone ).