Eustoma undetermined
Year: 2024
Type: other
Abstract: Eustoma sp. Plate 8: figs 12–14 Material. 3 specimens, SNSB-BSPG 2016 XXI 1801 –1803. Description. Shell high-spired, slender, with gradate spire and narrow ramp; a specimen 31 mm high; shell sides straight; whorl face with strong axially elongated subsutural nodes (9–10 per whorl) extending over more than of whorl height; broad, sometimes slightly nodular spiral cord at rounded angular transition to base; base slightly convex; whorls face and densely covered with spiral cords of variable strength separated by narrow furrows; aperture incompletely preserved with straight siphonal canal. Remarks. Ditretus sp., cf. rostellaria (Buvignier, 1852) has a similar ornament but differs in its stouter (less slender) shell shape, in having fewer whorls, a more delicate sculpture, and a very short abapical canal. Eustoma tuberculosa Piette, 1855 is larger and more slender, the aperture of adult specimens terminates adapically in a long, triangular extension. Diatinostoma aff. germaini Étallon sensu Yin (1931) has a wider, more triangular shell shape, spiral cords are largely missing, the transition from whorl face to base has a clear cord-like edge.
Authors: Gründel, Joachim, Nützel, Alexander
Language: English
Subfield: Paleontology
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6893114170
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