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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Stacheoceras gemmellaroi
Taxonomy
Stacheoceras gemmellaroi was named by Miller (1944) [Syntypes listed but no holotype designated]. Its type specimen is YPM 16653-16654 and is a 3D body fossil. Its type locality is King 38, Bed 5, Malascachas section, Las Delicias, which is in a Roadian marine shale/limestone in the Palo Quemado Formation of Mexico.
Synonymy list
| Year | Name and author |
|---|---|
| 1944 | Stacheoceras gemmellaroi Miller p. 107 figs. Pl 37, figs 6-9; text-fig 18 |
| 1977 | Stacheoceras gemmellaroi Nassichuk p. 576 figs. Pl 2, figs 6,7,10; pl 3, fig 6; text-figs 10,11,12B |
| 1990 | Stacheoceras gemmellaroi Bogoslovskaya p. 73 |
| 2002 | Stacheoceras gemmellaroi Leonova p. 84 |
| 2018 | Stacheoceras gemmellaroi Leonova p. 241 |
| 2024 | Stacheoceras gemmellaroi Alanis-Pavón et al. p. 6 figs. 6.6-6.9, 8 |
| 2025 | Stacheoceras gemmellaroi Alanis-Pavón et al. p. 869 figs. 5.7, 8.1-8.7, S4A |
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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.
†Stacheoceras gemmellaroi Miller 1944
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 6 | 13.2 | 9.40 | 20.2 | 12.3 | 4.09 | |
| shell diameter | 6 | 28.3 | 19.4 | 42.2 | 26.5 | 9.73 | |
| shell inflation | 6 | 2.01 | 1.20 | 3.20 | 2.10 | 0.826 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: base of the Roadian to the top of the Capitanian or 274.40000 to 259.51000 Ma
Collections (9 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Roadian | Mexico (Coahuila) | Stacheoceras gemmellaroi (type locality: 63055) | |
| Wordian | Canada (British Columbia) | Stacheoceras gemmellaroi (62319) | |
| Wordian | Mexico (Guerrero) | Stacheoceras toumanskyae (232710 232711 232715) | |
| Wordian | Mexico (Coahuila) | Stacheoceras gemmellaroi (133177 275659 275661) | |
| Capitanian | Mexico (Coahuila) | Stacheoceras gemmellaroi (63052) |