| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Pachydiscus (Pachydiscus) ultimus
Taxonomy
Pachydiscus (Pachydiscus) ultimus was named by Macellari (1986) [DISTRIBUTION: Maastrichtian; Antarctica.]. Its type specimen is OSU 38294, a shell, and it is not a trace fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1986 | Pachydiscus (Pachydiscus) ultimus Macellari pp. 46-48 figs. figs. 36.1-36.4 |
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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.
†Pachydiscus (Pachydiscus) ultimus Macellari 1986
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 6 | 68.7 | 35.1 | 116.5 | 80.6 | 36.9 | |
| shell diameter | 6 | 131.2 | 64.4 | 232.5 | 153.8 | 76.1 | |
| shell inflation | 6 | 21.3 | 10.7 | 39.1 | 23.9 | 13.0 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: Late/Upper Maastrichtian or 70.60000 to 66.00000 Ma
Collections (15 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Maastrichtian | Antarctica (Seymour Island) | Pachydiscus ultimus (63513) | |
| Maastrichtian | Antarctica | Pachydiscus ultimus (82950 82952 82963 82973 82974 82981) | |
| Late/Upper Maastrichtian | Antarctica | Pachydiscus ultimus (158427 158446 158447 158448 158449 158450) | |
| Late/Upper Maastrichtian | Antarctica (Seymour Island) | Pachydiscus ultimus (3169 166012) |