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Yokoyamaoceras
Taxonomy
Yokoyamaoceras was named by Wright and Matsumoto (1954) [Sepkoski's age data: K Turo , K Coni]. It is not extant.
It was assigned to Puzosiinae by Kennedy (1986); to Kossmaticeratinae by Wright (1996) and Kennedy and Summesberger (1999); to Kossmaticeratidae by Wright and Matsumoto (1954) and Toshimitsu and Hirano (2000); and to Ammonoidea by Sepkoski (2002).
It was assigned to Puzosiinae by Kennedy (1986); to Kossmaticeratinae by Wright (1996) and Kennedy and Summesberger (1999); to Kossmaticeratidae by Wright and Matsumoto (1954) and Toshimitsu and Hirano (2000); and to Ammonoidea by Sepkoski (2002).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1954 | Yokoyamaoceras Wright and Matsumoto |
| 1986 | Yokoyamoceras Kennedy p. 22 |
| 1996 | Yokoyamaoceras Wright |
| 1999 | Yokoyamaoceras Kennedy and Summesberger p. 25 |
| 2000 | Yokoyamaoceras Toshimitsu and Hirano |
| 2002 | Yokoyamaceras Sepkoski |
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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. †Yokoyamaoceras Wright and Matsumoto 1954
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†Yokoyamoceras jimboi Matsumoto 1955
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | |||||
|---|---|---|---|---|---|---|---|
| shell height | 1 | 9.80 | |||||
| shell diameter | 1 | 27.0 | |||||
| shell inflation | 1 | 7.10 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: base of the Turonian to the top of the Late/Upper Campanian or 93.90000 to 70.60000 Ma
Collections (12 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Turonian | Japan (Hokkaido) | Y. kotoi (38519) | |
| Coniacian - Santonian | Japan | Y. ishikawai, Y. sp. (193939) | |
| Santonian | Japan | Y. ishikawai (62209 62216 62335 62467) Y. ishikawai, Y. sp. (62210 62211) Y. sp. (62217) | |
| Early/Lower Santonian | Japan (Hokkaido) | Y. sp. (94682) | |
| Early/Lower Campanian | France | Yokoyamoceras jimboi (165817) | |
| Late/Upper Campanian | Austria | Y. sp. (48008) |