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Geratrigonia
Taxonomy
Geratrigonia was named by Kobayashi (1954) [Sepkoski's age data: J Hett J Toar Sepkoski's reference number: 93]. It is not extant. Its type is Trigonia hosourensis.
It was assigned to Trigonioida by Sepkoski (2002); and to Trigoniidae by Hayami (1975) and Ros-Franch et al. (2014).
It was assigned to Trigonioida by Sepkoski (2002); and to Trigoniidae by Hayami (1975) and Ros-Franch et al. (2014).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1954 | Geratrigonia Kobayashi |
| 1975 | Geratrigonia Hayami |
| 2002 | Geratrigonia Sepkoski |
| 2014 | Geratrigonia Ros-Franch et al. |
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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. †Geratrigonia Kobayashi 1954
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†Geratrigonia hosourensis Yokoyama 1904
†Geratrigonia kurumensis Kobayashi 1954
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| Reference: Aberhan et al. 2004 | |||||
Age range: base of the Hettangian to the top of the Late/Upper Toarcian or 201.30000 to 175.60000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hettangian | Japan (Miyagi) | G. hosourensis (39646 40219) G. lata, G. hosourensis (40541) | |
| Early/Lower Toarcian | Thailand | G. kurumensis (87541) | |
| Late/Upper Toarcian | Japan (Niigata) | G. kurumensis (40311) |