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Araeonema virgatum
Taxonomy
Araeonema virgatum was named by Knight (1933). It is not extant. Its type locality is SL-1. Headwaters of Feefee Creek, north of Olive St. & west of Lindberg Blvd., 1.5 km northwest of Stratmann (Olivette), which is in a Moscovian offshore shale in the Appanoose Formation of Missouri.
Synonymy list
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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.
†Araeonema virgatum Knight 1933
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1941 | Very small, subturbinate, minutely phaneromphalous gastropods, without a sinus, slit, or selenizone; whorl profile gently arched between sutures, rounded below on the final whorl; sutures moderately deep; nucleus simple, dextral, not sharply marked off from the succeeding whorls; base rounded, minutely phaneromphalous; columellar lip thin, gently arcuate, slightly reflexed about the umbilicus; parietal inductura very thin or wanting; outer lip gently oblique backwards from the upper suture, nearly straight; ornamentation fine revolving lirae that are frequently of unequal strength owing to the intercalation of new lirae on the later whorls; shell thin, of two distinctly different layers. The holotype measures about 3 mm. in height and 2.2 mm. in width, with a pleural angle of about 41 degrees. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: base of the Desmoinesian to the top of the Moscovian or 312.80000 to 307.00000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Moscovian | USA (Missouri) | Araeonema virgatum (type locality: 69773) | |
| Desmoinesian | USA (Texas) | Araeonema virgatum (11100) |