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Alzadites alzadensis
Taxonomy
Alzadites alzadensis was named by Kennedy and Cobban (1990). Its type specimen is USNM 423709, a shell, and it is a 3D body fossil. Its type locality is USGS Mesozoic 22871, Alzada, which is in a Cenomanian marine shale in the Belle Fourche Shale Formation of Montana. It is the type species of Alzadites.
Synonymy list
| Year | Name and author |
|---|---|
| 1990 | Alzadites alzadensis Kennedy and Cobban p. 398 figs. Pl 4, figs 1-10,14-16,43 |
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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.
†Alzadites alzadensis Kennedy and Cobban 1990
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 4 | 7.91 | 6.70 | 9.50 | 7.85 | 1.21 | |
| shell diameter | 4 | 15.4 | 13.4 | 16.6 | 15.8 | 1.40 | |
| shell inflation | 4 | 2.23 | 1.70 | 2.90 | 2.25 | 0.506 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: Middle Cenomanian or 100.50000 to 93.90000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Cenomanian | USA (Montana) | Alzadites alzadensis (type locality: 175422) |