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Keithiella cylindrica
Taxonomy
Arionellus cylindricus was named by Billings (1860). Its type specimen is Nat. Mus. Canada 837a, a cephalon/head, and it is a 3D body fossil. It is the type species of Keithiella.
It was recombined as Agraulos cylindricus by Miller (1889); it was recombined as Keithiella cylindrica by Rasetti (1944).
It was recombined as Agraulos cylindricus by Miller (1889); it was recombined as Keithiella cylindrica by Rasetti (1944).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1860 | Arionellus cylindricus Billings p. 243 |
| 1889 | Agraulos cylindricus Miller |
| 1944 | Keithiella cylindrica Rasetti p. 243 |
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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.
†Keithiella cylindrica Billings 1860
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: g = genus, f = family, o = order, c = class | |||||
| References: Hendy et al. 2009, Whittington et al. 1997, Hendy 2009, Aberhan et al. 2004 | |||||
Age range: base of the Trempealeauan to the top of the Sunwaptan or 492.50000 to 487.50000 Ma
Collections (8 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Sunwaptan | Canada (Newfoundland and Labrador) | Keithiella cylindrica (81270 81285 81286 81287) | |
| Trempealeauan | Canada (Quebec) | Keithiella cylindrica (224137 224138 224139 224140) |