Heliacanthus Daque 1938
Year: 2024
Type: other
Abstract: Heliacanthus? sp. 2 Plate 4: figs 2–7 Material. 7 specimens, SNSB – BSPG 2016 XXI 1730 –1736. Description. Shell broadly trochiform with rapidly expanding whorls and gradate spire; one of the better preserved specimens 20 mm wide; earliest whorls clearly exposed due to rapid sinking of suture; whorls ornamented with spiral cords and axial ribs, with nodular intersections; last whorl with rapidly forming wide, oblique ramp; subsutural row of small tubercles; at least 5 slightly knobby spiral cords on ramp; strong keel delimits ramp; keel with rapidly enlarging tubercles (approximately 9 on the last whorl); whorl face below keel vertical and delimited abapically by second knobby keel; at least two weak knobby spiral cords between two keels; a third, somewhat weaker keel forms border to almost flat base; two weak, knobby spiral cords present between second and third keel; base incompletely preserved, covered with several spiral cords; growth lines approximately straight, prosocline; aperture very large, round. Remarks. Turbo (Sarmaticus) stephanophorus Zittel, 1873 is more slender, it has fewer nodes on the keels and on the base, there is only a single nodular spiral cord visible (= bordering spiral cord)
Authors: Gründel, Joachim, Nützel, Alexander
Language: English
Subfield: Paleontology
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6893266587
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