Paprothites beckeri, Korn & Weyer, 2023

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 : 176

Paprothites beckeri sp. nov.

urn:lsid:zoobank.org:act:91E3B90F-6B65-4875-815A-568CFFEC7E20

Fig. 106C ; Table 103

Diagnosis

Species of Paprothites with a conch reaching 30 mm diameter. Conch at 15 mm dm extremely discoidal, subevolute (ww/dm ~0.35; uw/dm ~0.30). Whorl profile at 15 mm dm weakly compressed (ww/wh ~0.90); coiling rate moderate (WER ~1.80). Venter rounded, umbilical margin rounded. On the inner flank 15 very shallow, rounded ribs with nearly linear course.

Etymology

Named after R. Thomas Becker in appreciation of his studies on the Devonian–Carboniferous boundary.

Material examined

Holotype

GERMANY • Rhenish Mountains , Oberrödinghausen, railway cutting; Hangenberg Limestone, bed 3d1; Weyer 1993–1994 Coll.; illustrated in Fig. 106C ; MB.C.31208.

Description

Holotype MB.C.31208 with 16 mm dm is thinly discoidal with a moderately wide umbilicus (ww/dm = 0.34; uw/dm = 0.31). Its whorl profile is compressed (ww/wh = 0.87), the flanks are nearly parallel and the venter is rounded. The last volution shows only very weak radial plications, which have a concave course on the flanks. In the outer flank area, they are paralleled by faint and short constrictions. As can be seen in the umbilical opening, the penultimate volution bears coarser ribs, which amount about 18 per volution (106C).

Remarks

Paprothites beckeri sp. nov. has, with a uw/dm ratio of only 0.30, a much more narrowly umbilicate conch than all the other species of the genus. Furthermore, it has much weaker ribs, even when compared with P. raricostatus .

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.