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Anomphalus rotulus
Taxonomy
Anomphalus rotulus was named by Meek and Worthen (1867). It is a 3D body fossil. Its type locality is Hodges Creek, which is in a Desmoinesian carbonate limestone in the Carbondale Formation of Illinois.
Synonymy list
| Year | Name and author |
|---|---|
| 1867 | Anomphalus rotulus Meek and Worthen p. 268 |
| 1873 | Anomphalus rotulus Meek and Worthen p. 597 figs. pl. 29 f. 10 |
| 1933 | Anomphalus rotulus Knight p. 54 figs. 2a-c |
| 1941 | Anomphalus rotulus Knight pp. 37 - 38 figs. pl 63 f. 3a-b |
| 1973 | Anomphalus rotulus Gromczakiewicz-Ĺomnicka pp. 40 - 41 figs. pl. 8 f. 6 |
| 2023 | Anomphalus rotulus Wagner p. S4561 |
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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.
†Anomphalus rotulus Meek and Worthen 1867
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. B. Meek and A. H. Worthen 1873 | Shell small, depressed, narrowly rounded on the periphery; spire scarcely visible above the body whorl in a side view; volutions three and a half to four, increasing rather rapidly in breadth, last one sloping with a moderate con vexity between the suture and the periphery, and slightly excavated in the umbilical region; suture not impressed; aperture transversely suboval, being rounded on the outer side, and straightened on the lower half of the inner side, but modified by the convexity of the body whorl above; surface showing scarcely any traces of lines of growth, even under a good magnifier. | |
| J. B. Knight 1941 | Small rotelliform gastropods without sinus, slit, or selenizone and with a callus filling the umbilicus; whorls strongly embracing above, very gently arched between sutures, broadly rounded at the periphery of the final whorl; sutures sharply incised but shallow; nucleus normal and dextral; base rounded, cryptomphalous at mature stages, seemingly phaneromphalous at early stages, the callus, involving the columellar lip, flush with the base; columellar lip much thickened, bent strongly outward below, with a narrow horizontal groove separating it from the outer lip, parietal inductura thin; outer lip nearly straight, with very little backward obliquity, with a narrow excurrent canal at its juncture with the parietal wall; surface smooth, glossy, with only very fine lines of growth; shell thick, its structure unknown. The holotype measures about 2j mm. in height and 4 mm. in width, with a pleural angle of about 163 degrees. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Kiessling 2004, Bandel et al. 2002 | |||||
Age range: base of the Arundian to the top of the Desmoinesian or 346.70000 to 306.00000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Arundian | Poland (Swietokrzyskie) | Anomphalus rotulus (60115) | |
| Desmoinesian | USA (Pennsylvania) | Anomphalus rotulus (184098) | |
| Desmoinesian | USA (Illinois) | Anomphalus rotulus (type locality: 155332) | |
| Kasimovian - Gzhelian | USA (Utah) | Anomphalus rotulus (39995) |