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Zanabazar
Taxonomy
Zanabazar was named by Norell et al. (2009).
It was assigned to Troodontidae by Norell et al. (2009), Lü et al. (2010), Zanno et al. (2011), Xu et al. (2012), Godefroit et al. (2013), Hendrickx and Mateus (2014), Tsuihiji et al. (2014), Williamson and Brusatte (2014), Gianechini et al. (2017); and to Troodontinae by van der Reest and Currie (2017), Sellés et al. (2021).
It was assigned to Troodontidae by Norell et al. (2009), Lü et al. (2010), Zanno et al. (2011), Xu et al. (2012), Godefroit et al. (2013), Hendrickx and Mateus (2014), Tsuihiji et al. (2014), Williamson and Brusatte (2014), Gianechini et al. (2017); and to Troodontinae by van der Reest and Currie (2017), Sellés et al. (2021).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2009 | Zanabazar Norell et al. pp. 26-27 |
| 2010 | Zanabazar Lü et al. p. 382 |
| 2011 | Zanabazar Zanno et al. p. 15 fig. 15 |
| 2012 | Zanabazar Xu et al. p. 144 |
| 2013 | Zanabazar Godefroit et al. |
| 2014 | Zanabazar Hendrickx and Mateus |
| 2014 | Zanabazar Tsuihiji et al. p. 139 |
| 2014 | Zanabazar Williamson and Brusatte p. 13 |
| 2017 | Zanabazar Gianechini et al. p. 12 fig. 8 |
| 2017 | Zanabazar van der Reest and Currie p. 933 |
| 2021 | Zanabazar Sellés et al. p. 6 |
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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
| Reference | Diagnosis | |
|---|---|---|
| M. A. Norell et al. 2009 | Differs from Saurornithoides mongoliensis and most other troodontids (save Troodon formosus) in lacking a small depression on the lateral wall of the braincase just dorsal to the trigeminal foramen. The holotype of Zanabazar junior is the largest published troodontid specimen (midline length of the skull 5 272 mm), and is substantially larger than most other troodontid species. Only Troodon formosus appears to approach it in size. Differs from Troodon formosus in having a more ovoid-shaped foramen magnum, a posttemporal fenestra that is enclosed by an almost equal proportion of the exoccipital/opisthotic and squamosal (this same feature in Troodon formosus is formed almost entirely by the exoccipital/opisthotic), a deeper paroccipital process resulting in a different positon of the posttemporal fossa relative to the foramen magnum, and the lack of an osseous signature of the ophthalmic branch of the trigeminal nerve (CN V) in the laterosphenoid.
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Measurements
No measurements are available
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| Source: f = family, o = order | |||||
| References: Marsh 1875, Holtz et al. 2000 | |||||
Age range: Maastrichtian or 72.20000 to 66.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Maastrichtian | Mongolia (Omnogov) | Saurornithoides junior (52012) |