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Acanthonema newberryi
Taxonomy
Orthonema newberryi was named by Meek (1871). It is a 3D body fossil. Its type locality is Otsego, which is in an Emsian transition zone/lower shoreface sandstone in the Sylvania Sandstone Formation of Ohio.
It was recombined as Acanthonema newberryi by Grabau and Sherzer (1910) and Wagner (2023).
It was recombined as Acanthonema newberryi by Grabau and Sherzer (1910) and Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1871 | Orthonema newberryi Meek p. 81 |
| 1873 | Orthonema newberryi Meek pp. 217 - 218 figs. pl. 20 f. 3a-b |
| 1910 | Acanthonema newberryi Grabau and Sherzer pp. 184 - 185 figs. pl. 27 f. 5 |
| 2023 | Acanthonema newberryi Wagner p. 2491 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Acanthonema newberryi Meek 1871
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. B. Meek 1871 | Shell turreted, elongate-conical; volutions eight or nine in adult examples, compressed-convex, with a more outward slope than the general slant of the spire, the most convex part being near the lower side of each, a little above the suture; first one or two very small and depressed, and the next one or two more rapidly increasing in size than those below, thus giving a proportionally shorter and more conical appearance to.young than adult specimens; suture well defined, in consequence of the prominence of the lower part of each turn just above. Surface ornamented by three very slender, raised revolving lines, one of which is placed a little below the suture, and the other two below the middle of the turns of the spire, and on the middle of the last volution; of these revolving lines the upper two are broken up into minute, regularly arranged, projecting points, while the other is usually continuous; lines of growth minute, sharply defined, and very regularly and closely arranged, passing vertically and very nearly or quite straight across the volutions. |