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Stearoceras
Taxonomy
Stearoceras was named by Hyatt (1893) [Sepkoski's age data: C Bash-u C Mosc-l Sepkoski's reference number: 524].
It was assigned to Nautilida by Sepkoski (2002); to Grypoceratidae by Teichert et al. (1964), Miao et al. (2019); and to Liroceratidae by Korn (2025).
It was assigned to Nautilida by Sepkoski (2002); to Grypoceratidae by Teichert et al. (1964), Miao et al. (2019); and to Liroceratidae by Korn (2025).
Synonymy list
| Year | Name and author |
|---|---|
| 1893 | Stearoceras Hyatt p. 422 |
| 1964 | Stearoceras Teichert et al. p. 436 |
| 2002 | Stearoceras Sepkoski |
| 2019 | Stearoceras Miao et al. p. 333 |
| 2025 | Stearoceras Korn p. 65 |
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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. †Stearoceras Hyatt 1893
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†Stearoceras conchiferum Hyatt 1891
†Stearoceras gibbosum Hyatt 1891
†Stearoceras hesperium Miller and Youngquist 1949
†Stearoceras immane Reed 1931
†Stearoceras involutum Tucker 1976
†Stearoceras militarium Hyatt 1893
†Stearoceras milleri Sealey and Lucas 2025
†Stearoceras phosphoriense Branson 1930
†Stearoceras punjabicum Reed 1944
†Stearoceras rotundatum Miller and Unklesbay 1942
†Stearoceras sanandreasense Miller et al. 1933
†Stearoceras simplex Hyatt 1893
†Stearoceras smithi Gordon 1964
†Stearoceras sublaeve Miller et al. 1932
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 13 | 38.9 | 18.0 | 65.2 | 40.3 | 13.5 | |
| shell diameter | 13 | 94.4 | 33.9 | 191.3 | 118.0 | 50.6 | |
| shell inflation | 13 | 35.8 | 8.00 | 90.1 | 53.0 | 27.4 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: base of the Morrowan to the top of the Changhsingian or 323.40000 to 251.90200 Ma
Collections (48 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Morrowan | USA (Arkansas) | S. smithi (43205) S. sp. (43354) | |
| Bashkirian | USA (Arkansas) | Endolobus missouriensis (158037) | |
| Moscovian | USA (Arkansas) | S. gibbosum (158010 158013) | |
| Missourian | USA (Texas) | S. gibbosum (49987) | |
| Virgilian | USA (Illinois) | S. involutum (50219) | |
| Asselian | USA (Nebraska) | S. sublaeve (113424) | |
| Sakmarian | Japan | S. sp. (107622) | |
| Artinskian | USA (Texas) | S. conchiferum, S. militarium, S. simplex (108766) S. sp. (113418) | |
| Artinskian | Japan | S. sp. (107623) | |
| Kungurian | China | S. sp. A, S. sp. B (66112) | |
| Kungurian | USA (Texas) | S. conchiferum (113427) Titanoceras sanandreasense (90740 90745 90747 90749 90750) | |
| Kungurian | USA (New Mexico) | S. rotundatum (83179) S. rotundatum, S. sanandreasense, S. milleri (276619) S. sanandreasense (276617) S. sp. (89628) S. sp., S. rotundatum, S. sanandreasense (276618) S. sp., S. rotundatum, S. sanandreasense, S. milleri (276616) Titanoceras rotundatum, Titanoceras sanandreasense (113092) | |
| Kungurian | Colombia | Titanoceras sp. (40949) | |
| Roadian | USA (New Mexico) | S. sp. (113420) | |
| Roadian | USA (Texas) | Domatoceras sp. (43512) | |
| Roadian | USA (Arizona) | Titanoceras rotundatum (113094) Titanoceras rotundatum, Titanoceras sanandreasense (105411 113091 113093) | |
| Capitanian | Mexico (Coahuila) | S. sp. (62907) | |
| Capitanian | Pakistan | S. immane (125867 127033) | |
| Wuchiapingian | Pakistan | Nautilus immanis (236231 236232) S. immane (126010 126738 126932) S. punjabicum (126983) | |
| Wuchiapingian | USA (California) | S. phosphoriense (109000) | |
| Wuchiapingian | Azerbaijan | S. sp. (116755) | |
| Lopingian | USA (Wyoming) | Asymptoceras phosphoriense (236337) S. phosphoriense (83006) S. sp. (11223) | |
| Changhsingian | Pakistan | S. punjabicum (126882) |