Caryomphalus undetermined
Year: 2024
Type: other
Abstract: Caryomphalus sp., cf. concavus Gründel, Keupp & Lang, 2017 Plate 3: figs 2–3 Material. 1 specimen from Saal, SNSB – BSPG 2016 XXI 1717. Description. Shell trochiform; illustrated specimen 14 mm high; whorls weakly convex, evenly expanding; earliest preserved whorl with two nodular spiral cords, one in suprasutural position, other spiral cord between edge and abapical suture; a further spiral cord soon appears above edge; this spiral cord is initially weaker than the other cords but rapidly becomes as strong as other cords; suture somewhat deflected downward on the last part of last whorl, so that another spiral cord becomes exposed on penultimate whorl; edge becomes weaker, and changes to a regular spiral cord on last whorl so that whorl face becomes convex with evenly rounded transition to base; base narrowly phaneromphalous, weakly convex, covered with ca. 10 spiral cords that are somewhat weaker than those on whorl face; all spiral cords bear fine tubercles that are elongated in prosocline direction; details of round aperture not preserved. Remarks. In Caryomphalus concavus Gründel, Keupp & Lang, 2017, the late whorls are more rapidly increasing (more concave flanks of shell); it has axial ribs on the early whorls, and the inner spiral cords on the base are separated by wider interspaces than the outer spiral cords.
Authors: Gründel, Joachim, Nützel, Alexander
Language: English
Subfield: Paleontology
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6930397185
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