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Proplina extensum
Taxonomy
Tryblidium extensum was named by Berkey (1898). Its type specimen is AMNH 22276, a shell, and it is a 3D body fossil. Its type locality is 1 kilometer south of Taylors Falls, half kilometer north of Folsom Island, which is in a Steptoean coastal sandstone in the Franconia Formation of Minnesota.
It was recombined as Proplina extensum by Yochelson and Webers (2006).
It was recombined as Proplina extensum by Yochelson and Webers (2006).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1898 | Tryblidium extensum Berkey p. 281 figs. pl. 20 f. 16-17 |
| 2006 | Proplina extensum Yochelson and Webers pp. 37 - 38 figs. 4B1-2 |
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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.
†Proplina extensum Berkey 1898
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. L. Yochelson and G. F. Webers 2006 | Elongate, low, rugose shells; apical area is unknown, shorter slope is unknown; longer slope of dorsum is very gently curved; shell is seemingly low and uniformly arched laterally; growth lines are rugose, simple in outline, slightly irregular in spacing, but generally separated by about 1 millimeter. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class | |||||
| References: Hendy 2009, Hendy et al. 2009 | |||||
Age range: Steptoean or 497.00000 to 493.50000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Steptoean | USA (Minnesota) | Tryblidium extensum (type locality: 156300) | |
| Franconian | USA (Wisconsin) | Proplina extensum (156481) |