Late Jurassic (Upper Kimmeridgian) Heterobranchia (Gastropoda) of the coral-facies of Saal near Kelheim and the viciniy of Nattheim (Germany) Author Gruendel, Joachim Institut fuer Geowissenschaften, Fachrichtung Palaeontologie, Freie Universitaet Berlin, Malteserstrasse 74 - 100, 12249 Berlin, Germany joachim.gruendel@lingua-pura.de Author Keupp, Helmut Institut fuer Geowissenschaften, Fachrichtung Palaeontologie, Freie Universitaet Berlin, Malteserstrasse 74 - 100, 12249 Berlin, Germany Author Lang, Fritz Drosselweg 16, 96114 Hirschaid, Germany Author Nuetzel, Alexander https://orcid.org/0000-0002-8852-7688 SNSB-Bayerische Staatssammlung fuer Palaeontologie und Geologie, Richard-Wagner-Str. 10, 80333 Muenchen, Germany & Department of Earth and Environmental Sciences, Paleontology and Geobiology, Ludwig-Maximilians-Universitaet Muenchen, Richard-Wagner-Str. 10, 80333 Muenchen, Germany text Zitteliana 2022 2022-12-12 96 179 221 http://dx.doi.org/10.3897/zitteliana.96.e84187 journal article http://dx.doi.org/10.3897/zitteliana.96.e84187 2747-8106-96-179 35B619086E6548B09A177281C2253391 FE0861D71BB454999EE6637C0D9B2B0C Bactroptyxis? tricincta ( Muenster in Goldfuss, 1844) Plate 13: figs 9, 10 *1844 - Nerinea tricincta Muenster - Muenster in Goldfuss: 42, pl. 176, fig. 1. 2017 - Nerineoidea Nr. 5 - Gruendel : 33, pl. 14 B. Material. One specimen from Saal, collection Lang, SNSB-BSPG 2021 XV 52. Description. The specimen is 47 mm high. The apical whorls, aperture, and base are missing. The shell is very slender. The whorl face is concave. The sutures are indistinct. The earliest preserved whorls have three spiral cords: a strong subsutural cord and a pair of closely spaced, somewhat weaker spiral cords below mid-whorl, close to the abapical suture. The area between the upper cord and the lower pair of cords is strongly concave. On late whorls, a fourth, weak spiral cord is intercalated between the upper cord and the lower pair of cords. The subsutural spiral cord is strong and crest-like on the latest preserved whorls. The base has an umbilicus. Remark. The aperture as well as number and arrangement of the plaits are unknown, therfore the generic assignment is doubtful.