GenusSaalidicerasgen. nov. Type species. Saalidiceras syllai gen. et sp. nov., by original designation herein. Diagnosis. Moderately large (Holotype: L = 63 mm; H = 85 mm), distinctly inequivalve epidiceratid with regularly coiled valves. Commissure crescent in outline. Two strong, broadly rounded, highly raised keels at the endpoints of the crescent enclose a broad, evenly rounded anterior trough. Coiling axes of both valves directed steeply downward-inward and slightly backward. Left valve with approximately 1.75 whorls, resembling a corkscrew in shape. Attachment surface indistinct, very small. Right valve with half a whorl only, forming a rapidly widening, incurved anterior trough. Shell interior, including hinge, unknown. Etymology. From the type locality, Saal an der Donau, and the genus name ‘ Diceras ’, indicating its placement in the basal Hippuritida. Remarks. The hinge of Saalidiceras gen. nov. is unknown, because the holotype and the three paratypes of Saalidiceras syllai gen. et sp. nov. are preserved with contiguous valves, and the additional specimens are strongly corroded fragments. Nevertheless, we think the assignment to the Epidiceratidae is well justified. The two valves are distinctly unequal in size, with the left, attached valve being significantly larger than the right one. Both valves are coiled, the left one attaining nearly two whorls, while the right one attains not more than two thirds of a whorl. Furthermore, the ligament is relatively long and external, sitting on elongate nymphs.

Published as part of Schneider, Simon & Werner, Winfried, 2026, The late Kimmeridgian bivalve fauna of Saal an der Donau (Bavaria, southern Germany): the Hippuritida, pp. 1-30 in Zitteliana 100 on pages 1-30, DOI: 10.3897/zitteliana.100.169922