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Pachydiscus (Neodesmoceras)
Taxonomy
Pachydiscus (Neodesmoceras) was named by Matsumoto (1947).
It was reranked as Neodesmoceras by Collignon (1952).
It was assigned to Ammonoidea by Collignon (1952); and to Pachydiscus by Matsumoto (1947), Jones (1963), Kennedy (1986), Kennedy and Henderson (1992), Kennedy and Cobban (1996).
It was reranked as Neodesmoceras by Collignon (1952).
It was assigned to Ammonoidea by Collignon (1952); and to Pachydiscus by Matsumoto (1947), Jones (1963), Kennedy (1986), Kennedy and Henderson (1992), Kennedy and Cobban (1996).
Subtaxa
Species lacking formal opinion data
Pachydiscus auritocostatus, Pachydiscus gollevilensis, Pachydiscus gracilis, Pachydiscus jacquoti, Pachydiscus japonicus, Pachydiscus mokitibense, Pachydiscus mokotibense, Pachydiscus neubergicus, Pachydiscus patagiosus, Pachydiscus riccardii, Pachydiscus stobaei, Pachydiscus subdulmensis, Pachydiscus suciaensis, Pachydiscus travisi, Pachydiscus vaju
Synonymy list
| Year | Name and author |
|---|---|
| 1947 | Pachydiscus (Neodesmoceras) Matsumoto |
| 1952 | Neodesmoceras Collignon |
| 1963 | Pachydiscus (Neodesmoceras) Jones p. 40 |
| 1986 | Pachydiscus (Neodesmoceras) Kennedy p. 38 |
| 1992 | Pachydiscus (Neodesmoceras) Kennedy and Henderson p. 428 |
| 1996 | Pachydiscus (Neodesmoceras) Kennedy and Cobban p. 799 |
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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.
Subg. †Pachydiscus (Neodesmoceras) Matsumoto 1947
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†Neodesmoceras catarinae Anderson and Hanna 1935
†Pachydiscus (Neodesmoceras) mokotibensis Collignon 1952
†Pachydiscus (Neodesmoceras) obsoletiformis Jones 1963
†Pachydiscus (Neodesmoceras) princeps Anderson 1958
†Pachydiscus (Neodesmoceras) soma Forbes 1846
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 6 | 70.2 | 8.50 | 240.0 | 75.0 | 94.7 | |
| shell diameter | 6 | 161.5 | 21.5 | 508.0 | 175.5 | 207.9 | |
| shell inflation | 6 | 35.5 | 5.20 | 96.5 | 46.5 | 33.5 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: base of the Campanian to the top of the Early/Lower Maastrichtian or 83.60000 to 66.00000 Ma
Collections (20 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Campanian | USA (Alaska) | Pachydiscus obsoletiformis (88822) | |
| Late/Upper Campanian | USA (Alaska) | Pachydiscus obsoletiformis (158292 158312 158313 158329 158377 158378) | |
| Late/Upper Campanian | Mexico (Baja California) | Neodesmoceras catarinae (233831) | |
| Early/Lower Maastrichtian | Mexico (Baja California) | Pachydiscus catarinae (86867) Pachydiscus sp. (86865) Parapachydiscus princeps (86866) | |
| Early/Lower Maastrichtian | USA (California) | Neodesmoceras sp. (215320) Pachydiscus sp. (86817) Parapachydiscus catarinae (83776 86821) | |
| Late/Upper Maastrichtian | India | Ammonites soma (41428) | |
| Late/Upper Maastrichtian | France | Pachydiscus mokitibense (83648) | |
| Maastrichtian | USA (California) | Parapachydiscus catarinae (83774) | |
| Maastrichtian | Mexico (Baja California) | Parapachydiscus catarinae (158099) | |
| Late/Upper Maastrichtian - Early/Lower Paleocene | USA (New Jersey) | Pachydiscus sp. (26819) |