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Eonatator sternbergii
Taxonomy
Clidastes sternbergi was named by Wiman (1920). Its type specimen is UPI R 163, a partial skeleton (A nearly complete skeleton), and it is a 3D body fossil. Its type locality is Bilby's Ranch, Beaver Creek, which is in a Santonian marine chalk in the Niobrara Formation of Kansas. It is the type species of Eonatator.
It was corrected as Clidastes sternbergii by Hay (1930); it was recombined as Halisaurus sternbergi by Russell (1970), Thurmond and Jones (1981), Bardet and Pereda Suberbiola (2001), Lindgren and Siverson (2005) and Fanti et al. (2014); it was recombined as Eonatator sternbergii by Bardet et al. (2005) and Driscoll et al. (2019).
It was corrected as Clidastes sternbergii by Hay (1930); it was recombined as Halisaurus sternbergi by Russell (1970), Thurmond and Jones (1981), Bardet and Pereda Suberbiola (2001), Lindgren and Siverson (2005) and Fanti et al. (2014); it was recombined as Eonatator sternbergii by Bardet et al. (2005) and Driscoll et al. (2019).
Synonymy list
| Year | Name and author |
|---|---|
| 1920 | Clidastes sternbergi Wiman p. 13 figs. Figs. 4-9, Plates 3-4 |
| 1930 | Clidastes sternbergii Hay p. 263 |
| 1967 | Clidastes sternbergi Russell p. 126 |
| 1970 | Halisaurus sternbergi Russell p. 369 |
| 1981 | Halisaurus sternbergi Thurmond and Jones p. 155 |
| 2001 | Halisaurus sternbergi Bardet and Pereda Suberbiola |
| 2005 | Eonatator sternbergii Bardet et al. |
| 2005 | Halisaurus sternbergi Lindgren and Siverson |
| 2014 | Halisaurus sternbergi Fanti et al. |
| 2019 | Eonatator sternbergii Driscoll et al. |
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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.
†Eonatator sternbergii Wiman 1920
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Lindgren and M. Siverson 2005 | Cervical and dorsal vertebrae very large relative to overall size of the animal. Marginal tooth-crowns small (up to 12.5 mm high), conical and subcircular in cross section. Carinae on marginal teeth inconspicuous. Enamel on marginal crowns thick at apex but very thin at base of crown. Surface of enamel either smooth or developed into faint, closely spaced, and undulating striations (particularly on the lingual face). Twenty-two teeth in dentary. |
Measurements
No measurements are available
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| Source: f = family, c = class, subp = subphylum, uc = unranked clade | |||||
| References: Gervais 1852, Carroll 1988, Hendy et al. 2009 | |||||
Age range: base of the Late/Upper Santonian to the top of the Early/Lower Campanian or 85.80000 to 70.60000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Santonian | USA (Kansas) | Clidastes sternbergi (type locality: 109698) | |
| Late/Upper Santonian - Early/Lower Campanian | USA (Alabama) | Halisaurus sternbergi (81972) | |
| Early/Lower Campanian | Sweden | Halisaurus sternbergi (102883) | |
| Early/Lower Campanian | Sweden (Skane) | Halisaurus sternbergi (106411) | |
| Early/Lower Campanian | Sweden (Skåne) | Halisaurus sternbergi (74334) |