Undetermined undetermined

Nododelphinulidae? gen. et sp. indet. Plate 4: figs 8–11 Material. 1 specimen, SNSB – BSPG 2016 XXI 1737. Description. Shell broadly turbiniform, with gradate spire; specimen 17 mm wide; earliest visible ornament consists of two edges, one at about mid-whorl, the other suprasutural; whorl face above adapical edge forms oblique ramp, approximately vertical below edge; nodular spiral cord in subsutural position; between this cord and adapical edge, first one, then a second spiral cord appear on ramp and also on whorl face between edges; whorl face ornamented with widely spaced, bulging axial ribs that continue onto center of base; axial ribs approximately orthocline on whorl face and distinctly opisthocline on base; adapical edge with numerous small nodes in early whorls but fewer and larger nodes on last whorl; same trend on abapical edge, but not as distinct; nodes spirally elongated, tapering in abapertural direction with narrow beginning and trumpet-like widening in apertural direction; spoon-like pits at apertural end of nodes, which terminate abruptly, immediately followed by narrow beginning of next node; widened spoon-like ending of elongate nodes lies at intersection of axial ribs and spiral cords; base flatly convex with angular transition to whorl face; base covered with nodular spiral cords; aperture not preserved. Remarks. The morphology of the spirally elongated nodes is to our knowledge unique; we know of no other example from the literature.

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Publication Details

Journal
Zenodo (CERN European Organization for Nuclear Research)
Published
2024-12-11
DOI
https://doi.org/10.5281/zenodo.14395386
Primary Topic
Chemical Synthesis and Characterization
Type
article
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Zenodo (CERN European Organization for Nuclear Research)
Chemical Synthesis and Characterization
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Undetermined undetermined

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Abstract

Nododelphinulidae? gen. et sp. indet. Plate 4: figs 8–11 Material. 1 specimen, SNSB – BSPG 2016 XXI 1737. Description. Shell broadly turbiniform, with gradate spire; specimen 17 mm wide; earliest visible ornament consists of two edges, one at about mid-whorl, the other suprasutural; whorl face above adapical edge forms oblique ramp, approximately vertical below edge; nodular spiral cord in subsutural position; between this cord and adapical edge, first one, then a second spiral cord appear on ramp and also on whorl face between edges; whorl face ornamented with widely spaced, bulging axial ribs that continue onto center of base; axial ribs approximately orthocline on whorl face and distinctly opisthocline on base; adapical edge with numerous small nodes in early whorls but fewer and larger nodes on last whorl; same trend on abapical edge, but not as distinct; nodes spirally elongated, tapering in abapertural direction with narrow beginning and trumpet-like widening in apertural direction; spoon-like pits at apertural end of nodes, which terminate abruptly, immediately followed by narrow beginning of next node; widened spoon-like ending of elongate nodes lies at intersection of axial ribs and spiral cords; base flatly convex with angular transition to whorl face; base covered with nodular spiral cords; aperture not preserved. Remarks. The morphology of the spirally elongated nodes is to our knowledge unique; we know of no other example from the literature.

Zenodo (CERN European Organization for Nuclear Research)
Bayerische Staatssammlung für Paläontologie und Geologie (DE), Freie Universität Berlin (DE), Ludwig-Maximilians-Universität München (DE)
Openalex Percentile: Top 55%
Chemical Synthesis and Characterization
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