Curtoceras meyeri Aubrechtová & Korn, 2025, sp. nov.

Curtoceras meyeri sp. nov. urn:lsid:zoobank.org:act: 69962EDA-B814-4DA9-84FA-8592B6E57609 Fig. 36; Table 24 Diagnosis Species of the genus Curtoceras with an adult conch exceeding 40 mm in diameter. At 40 mm diameter, the conch is discoidal (CWI ~ 0.45) and subevolute (UWI ~ 0.45) with high coiling rate (WER ~ 2.20); whorl profile with rounded flanks and venter, weakly depressed (WWI ~ 1.35) and weakly embracing (IZR = 0.05). Shell surface with lirae. Phragmocone chambers short (RCL ~ 0.10). Suture line almost straight or with a very shallow lateral lobe and a ventral saddle. Siphuncle subdorsal (RSP ~ 0.85) and narrow (RSH ~ 0.15). Etymology Named after Günter Meyer (Bernau), who donated a well-preserved Curtoceras specimen to be studied herein. Type material Holotype GERMANY • unspecified locality in northern Germany;?Lasnamägi Regional Stage; illustrated in Fig. 36A; MB.C. 11550. Description Holotype MB.C.11550 (Fig. 36A) is a subadult conch with 41 mm diameter and has almost three whorls preserved; the body chamber is missing. In the last half whorl, the conch is discoidal (CWI = 0.46) and subevolute (UWI = 0.44); the coiling rate is high (WER = 2.20). The whorl profile has broadly rounded flanks and venter; it is weakly depressed (WWI = 1.35) and weakly embracing (IZR = 0.04) (Fig. 36B). The shell ornament is preserved only in a small area on the venter, where it consists of lirae that extend into a ventral sinus. The phragmocone chambers are short (RCL = 0.11). The suture line is almost straight or possesses a very shallow lateral lobe; however, on the venter of at least the last whorl, the suture line extends into a progressively pronounced saddle. The siphuncle is subdorsal in position (RSP = 0.85) and about 0.16 in relative diameter (RSH). Remarks Curtoceras meyeri sp. nov. differs from other species of Curtoceras in the increasingly pronounced external saddle of the suture line starting with the third whorl, combined with the comparably high WWI and comparatively short phragmocone chambers.