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Protacanthoceras
Taxonomy
Protacanthoceras was named by Spath (1923) [Sepkoski's age data: K Ceno-u]. Its type is Plesiacanthoceratoides vetula.
It was assigned to Ammonoidea by Sepkoski (2002); and to Acanthoceratinae by Cooper (1978), Kennedy et al. (1996), Wright et al. (1996) and Kennedy and Jolkicev (2004).
It was assigned to Ammonoidea by Sepkoski (2002); and to Acanthoceratinae by Cooper (1978), Kennedy et al. (1996), Wright et al. (1996) and Kennedy and Jolkicev (2004).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1923 | Protacanthoceras Spath p. 144 |
| 1978 | Protacanthoceras Cooper p. 89 |
| 1996 | Protacanthoceras Kennedy et al. p. 13 |
| 1996 | Protacanthoceras Wright et al. p. 158 |
| 2002 | Protacanthoceras Sepkoski |
| 2004 | Protacanthoceras Kennedy and Jolkicev p. 374 |
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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.
G. †Protacanthoceras Spath 1923
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†Protacanthoceras alzadense Cobban 1987
†Protacanthoceras bunburianus Sharpe 1853
†Protacanthoceras fisherense Cobban 1987
†Protacanthoceras hosei sheridanense Cobban 1987
†Protacanthoceras involutum Thomel 1972
†Protacanthoceras proteus Wright and Kennedy 1980
†Protacanthoceras proteus vascoceratoides Wright and Kennedy 1987
†Protacanthoceras tuberculatum Thomel 1972
†Protacanthoceras vetula Cobban 1987
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. W. Wright et al. 1996 | Dwarf with macroconchs and microconchs differing primarily in size; rather involute to evolute; compressed to inflated; with more or less prominent umbilical and inner ventrolateral tubercles; outer ventrolateral and siphonal tubercles tending to form 3 close rows of clavi on broad or narrow venter, clavi generally uniting on outer part of body chamber to form chevronlike ribs. Suture with plump, round, only moderately indented elements. |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 4 | 8.35 | 6.50 | 11.2 | 8.20 | 2.04 | |
| shell diameter | 4 | 18.4 | 13.8 | 26.8 | 17.8 | 5.71 | |
| shell inflation | 4 | 4.24 | 3.00 | 6.10 | 4.20 | 1.29 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: base of the Late/Upper Cenomanian to the top of the Cenomanian or 99.60000 to 93.90000 Ma
Collections (18 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cenomanian | France | P. falndrini (230798) | |
| Cenomanian | France (Normandie) | P. spp. nov. (230777) | |
| Late/Upper Cenomanian | Venezuela (Lara) | P. bunburianum (87995) | |
| Late/Upper Cenomanian | USA (South Dakota) | P. proteus (77738) | |
| Late/Upper Cenomanian | Angola | P. sp. A, P. sp. B (175545) | |
| Late/Upper Cenomanian | United Kingdom (England) | P. sp. (82857 82899 82913) | |
| Middle Cenomanian | France | P. involutum (230896) P. tuberculatum, P. involutum (230897) | |
| Middle Cenomanian | USA (Montana) | P. alzadense (175422) | |
| Middle Cenomanian | USA (Wyoming) | P. fisherense (230894) P. hosei (231777) P. sheridanense (231776) P. vetula (177081) | |
| Middle Cenomanian | Bulgaria | P. tuberculatum (174935 174943) | |
| Middle Cenomanian | USA (South Dakota) | P. hosei (232640) |