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Semiformiceras
Taxonomy
Semiformiceras is a genus. It is not extant.
It was assigned to Oppeliidae by Zeiss et al. (1994); to Ammonoidea by Sepkoski (2002); and to Streblitinae by Arkell et al. (1957), Grigore (2018).
It was assigned to Oppeliidae by Zeiss et al. (1994); to Ammonoidea by Sepkoski (2002); and to Streblitinae by Arkell et al. (1957), Grigore (2018).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1957 | Semiformiceras Arkell et al. p. 284 |
| 1994 | Semiformiceras Zeiss et al. p. 370 |
| 2002 | Semiformiceras Sepkoski |
| 2018 | Semiformiceras Grigore p. 18 |
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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. †Semiformiceras
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†Semiformiceras beticum Enay and Geyssant 1975
†Semiformiceras birkenmajeri Kutek and Wierzbowski 1986
†Semiformiceras darwini Neumayr 1873
†Semiformiceras fallauxi Oppel 1865
†Semiformiceras gemmellaroi Zittel 1870
†Semiformiceras semiforme tuberosum Oloriz 1978
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | |||||
|---|---|---|---|---|---|---|---|
| shell height | 1 | 33.6 | |||||
| shell diameter | 1 | 68.0 | |||||
| shell inflation | 1 | 6.00 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: base of the Early/Lower Tithonian to the top of the Late/Upper Tithonian or 149.20000 to 143.10000 Ma
Collections (24 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Oxfordian - Berriasian | Spain | S. semiforme (73297) | |
| Early/Lower Tithonian | Hungary | S. semiforme (23872) | |
| Early/Lower Tithonian | Italy (Ancona) | S. birkenmajeri (46385) S. fallauxi (46535 46537) S. gemmellaroi (46538) S. semiforme (46386 46527) | |
| Early/Lower Tithonian | Romania | S. fallauxi (198323 198324) S. semiforme (198321 198322) | |
| Early/Lower Tithonian | Spain | S. rotundus (235571) S. tuberosum (235570) | |
| Early/Lower Tithonian | Italy | S. semiforme (184797 184800 184804 184806) | |
| Middle Tithonian | Poland | S. fallauxi (44878 44879) | |
| Tithonian | Spain | S. semiforme, Neochetoceras beticum (235585) | |
| Tithonian | Argentina | S. sp. (236414) | |
| Late/Upper Tithonian | France | S. fallauxi (235572) | |
| Late/Upper Tithonian | Poland | S. spp., S. birkenmajeri (235575) |