Paralytoceras sp. 1, 1902

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 : 191

Paralytoceras sp. 1

Fig. 116B

Material examined

GERMANY • 1 specimen; Rhenish Mountains , Oberrödinghausen , railway cutting ; Hangenberg Limestone , bed 3d1; Weyer 1993–1994 Coll.; illustrated in Fig. 116B ; MB.C.31225 • 1 specimen; Rhenish Mountains , Oberrödinghausen , road cutting ; Hangenberg Limestone , bed 3d; Korn & Weyer 2000 Coll.; MB.C.31226 .

Description

The fragmentary specimen MB.C.31225 has about 8.5 mm whorl height and belongs to a subevolute ammonoid ( Fig. 116B ). The venter bears a prominent keel, which is raised out of the venter. The flank is covered by numerous collars standing in distances of 1.0 to 1.4 mm; these collars extend from the umbilical seam across flanks and venter. Between these collars, there occur very fine growth lines and coarser spiral elements, the latter cause a crenulation on the margins of the collars.

Paralytoceras (?) sp. 2

Fig. 116C ; Table 112

Material examined

GERMANY • 1 specimen; Rhenish Mountains , Oberrödinghausen, railway cutting; Hangenberg Limestone, bed 3d1b; Weyer 1993–1994 Coll.; illustrated in Fig. 116C ; MB.C.31227 .

Description

The single specimen (MB.C.31227) has 12.5 mm and is a thickly discoidal, subevolute conch with kidney-shaped whorl profile. Its ornament consists of coarse, sharp growth lines that extend with a wide sinus across the flanks and form a high, narrow ventrolateral projection and a rather narrow, deep ventral sinus ( Fig. 116C ).

Figures

Fig. 116. Paralytoceras from the Oberrödinghausen railway cutting. A. Paralytoceras crispum (Tietze, 1870), specimen MB.C.31223 (Vöhringer Coll.) from bed 2. B. Paralytoceras sp. 1, specimen MB.C.31225 (Weyer 1993–1994 Coll.) from bed 3d1.C. Paralytoceras (?) sp. 2, specimen MB.C.31227 (Weyer 1993–1994 Coll.) from bed 3d1b. Scale bar units =1 mm.