Paprothites raricostatus ( Vöhringer, 1960 )

Korn, Dieter & Weyer, Dieter, 2023, The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany), European Journal of Taxonomy 882, pp. 1-230 : 175-176

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.

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).

Figures

Fig. 106. Paprothites from the Oberrödinghausenrailway 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.