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Hemiaster humphreysanus
Taxonomy
Hemiaster humphreysanus was named by Meek and Hayden (1856). It is a 3D body fossil. Its type locality is Yellowstone River, 150 miles above mouth, which is in a Maastrichtian marine shale in the Pierre Shale Formation of Montana.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1856 | Hemiaster humphreysanus Meek and Hayden |
| 1915 | Hemiaster humphreysanus Clark and Twitchell p. 95 |
| 1953 | Hemiaster humphreysanus Cooke p. 30 figs. Pl 12, figs 1-4 |
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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.
†Hemiaster humphreysanus Meek and Hayden 1856
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum | |||||
| References: Aberhan 1992, Kiessling 2004 | |||||
Age range: base of the Late/Upper Campanian to the top of the Maastrichtian or 83.60000 to 66.00000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian | USA (Utah) | Hemiaster humphreysanus (78178) | |
| Early/Lower Maastrichtian | USA (Montana) | Hemiaster humphreysanus (type locality: 197464) | |
| Early/Lower Maastrichtian | USA (Wyoming) | Hemiaster humphreysanus (78177) | |
| Early/Lower Maastrichtian | USA (Arkansas) | Hemiaster humphreysanus (78179 197465) | |
| Maastrichtian | USA (Mississippi) | Hemiaster humphreysanus (78180) |