The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany) Author Korn, Dieter 286CA4F3-7EBC-4AEF-A66A-B2508D001367 Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstrasse 43, 10115 Berlin, Germany. dieter.korn@mfn.berlin Author Weyer, Dieter A09A1738-C70E-4F22-A069-8B7DB4A1753D Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstrasse 43, 10115 Berlin, Germany. dieter.weyer@t-online.de text European Journal of Taxonomy 2023 2023-07-19 882 1 230 http://dx.doi.org/10.5852/ejt.2023.882.2177 journal article 58033 10.5852/ejt.2023.882.2177 57d1d191-2bf5-4229-a0f5-9ab472a114a6 2118-9773 8177581 67C909E4-C700-4F8D-B8CE-5FD9B2C5D549 Paprothites raricostatus ( Vöhringer, 1960 ) Fig. 106A–B ; Table 102 Pseudarietites dorsoplanus raricostatus Vöhringer, 1960: 162 , pl. 6 fig. 9. Paprothites raricostatus – Korn 1994: 77 , text-fig. 70c; 2006: text-fig. 4f. Diagnosis Species of Paprothites with a conch reaching 30 mm diameter. Conch at 15 mm dm thinly discoidal, subevolute (ww/dm ~0.40; uw/dm ~0.35). Whorl profile at 15 mm dm weakly depressed (ww/wh ~1.20); coiling rate low (WER ~1.70). Venter rounded, umbilical margin rounded. On the inner flank 20 shallow, rounded ribs with nearly linear course. Material examined Holotype GERMANY • Rhenish Mountains , Oberrödinghausen , railway cutting ; Hangenberg Limestone , bed 3d ; Vöhringer Coll.; illustrated by Vöhringer (1960 : pl. 6 fig. 9), Korn (1994: text-fig. 70c) and Korn (2006 : text-fig. 4f); re-illustrated herein Fig. 106A ; GPIT-PV-63973. Additional material GERMANY • 1 specimen ; Rhenish Mountains , Oberrödinghausen , railway cutting ; Hangenberg Limestone , bed 3d 1; Weyer 1993–1994 Coll.; MB.C.31205 • 1 specimen ; Rhenish Mountains , Oberrödinghausen , railway cutting ; Hangenberg Limestone , bed 3d1a ; Weyer 1993–1994 Coll.; MB.C.31206 • 1 specimen ; Rhenish Mountains , Oberrödinghausen , railway cutting ; Hangenberg Limestone , bed 3d1b ; Weyer 1993–1994 Coll.; MB.C.31207. Description Holotype GPIT-PV-63973 is a specimen with 14 mm conch diameter ( Fig. 106A ); it is thinly discoidal and subevolute (ww/dm = 0.41; uw/dm = 0.37) with a weakly depressed, broadly rounded whorl profile (ww/wh = 1.19) and a low coiling rate (WER = 1.71). It has a sculpture with weak radial plications on the inner flank. Specimen MB.C.31207 is a well-preserved specimen with 18.5 mm conch diameter ( Fig. 106B ). It is thinly discoidal and subevolute (ww/dm = 0.35; uw/dm = 0.40) with a very weakly depressed whorl profile (ww/wh = 1.05). Umbilical margin, flanks and venter are broadly rounded. The last whorl possesses about 24 very low plications, which extend slightly forward and disappear already in the outer flank area. Fig. 106. Paprothites from the Oberrödinghausen railway cutting. A . Paprothites raricostatus ( Vöhringer, 1960 ) , holotype GPIT-PV-63973 (Vöhringer Coll.) from bed 3d. B . Paprothites raricostatus ( Vöhringer, 1960 ) , specimen MB.C.31207 (Weyer 1993–1994 Coll.) from bed 3d1b. C . Paprothites beckeri sp. nov. , holotype MB.C.31208 (Weyer 1993–1994 Coll.) from bed 3d1. Scale bar units =1 mm. Table 102. Conch measurements, ratios and rates of Paprothites raricostatus ( Vöhringer, 1960 ) .

specimen	dm	ww	wh	uw	ah	ww/dm	ww/wh	uw/dm	WER	IZR
MB.C.31207	18.57	6.57	6.24	7.44	4.23	0.35	1.05	0.40	1.68	0.32
GPIT-PV-63973	14.05	5.81	4.87	5.18	3.29	0.41	1.19	0.37	1.71	0.32

Remarks Paprothites raricostatus has conch proportions like P. dorsoplanus , but is clearly separated by the much weaker sculpture. While P. dorsoplanus has rather sharp riblets, in P. raricostatus there are only very faint plications at 15–20 mm conch diameter. P. beckeri has a much narrower umbilicus (uw/dm = 0.30) than P. raricostatus (uw/dm = 0.40).