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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Quadratotrigonia
Taxonomy
Quadratotrigonia was named by Dietrich (1933) [Sepkoski's age data: J Tith K Ceno]. It is not extant. Its type is Trigonia nodosa.
It was synonymized subjectively with Yaadia by Cox (1952).
It was assigned to Trigoniidae by Vokes (1980); to Trigonioida by Sepkoski (2002); and to Quadratotrigoniini by Bouchet et al. (2010).
It was synonymized subjectively with Yaadia by Cox (1952).
It was assigned to Trigoniidae by Vokes (1980); to Trigonioida by Sepkoski (2002); and to Quadratotrigoniini by Bouchet et al. (2010).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1933 | Quadratotrigonia Dietrich |
| 1980 | Quadratotrigonia Vokes p. 99 |
| 2002 | Quadratotrigonia Sepkoski |
| 2010 | Quadratotrigonia Bouchet 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.
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: f = family | |||||
| References: Ros-Franch et al. 2014, Aberhan et al. 2004 | |||||
Age range: base of the Valanginian to the top of the Turonian or 137.05000 to 89.80000 Ma
Collections (17 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Valanginian | Ukraine (Crimea) | Q. nodosa (124740 124742 124867 124868) | |
| Hauterivian - Valanginian | Italy (Sardinia) | Q. nodosa (2089) | |
| Hauterivian | Ukraine (Crimea) | Q. nodosa (124749 124869) | |
| Barremian | Turkmenistan | Q. sp. (170614) | |
| Early/Lower Aptian | United Kingdom (England) | Q. nodosa (235315) | |
| Aptian | Mexico (Sonora) | Q. guildi (82140) Q. mearnsi (82135) | |
| Late/Upper Aptian | France | Q. nodosa (56673 58865) | |
| Middle Albian | USA (California) | Q. sp. A (239781 239782) | |
| Late/Upper Albian | United Kingdom (England) | Q. daedala, Q. spectabilis (6280) | |
| Turonian | Mexico (Baja California) | Q. sp. B (220407) |