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Mei long
Taxonomy
Mei long was named by Xu and Norell (2004). Its type specimen is IVPP V.12733, a skeleton, and it is a 3D body fossil. Its type locality is Lujiatun village, Shangyuan [general] (IVPP), which is in a Barremian/Aptian fluvial tuff in the Yixian Formation of China.
Synonymy list
| Year | Name and author |
|---|---|
| 2004 | Mei long Xu and Norell p. 838 figs. 1-2 |
| 2007 | Mei long Turner et al. p. 7 |
| 2009 | Mei long Bever and Norell p. 3 |
| 2009 | Mei long Norell et al. p. 22 |
| 2010 | Mei long Lü et al. p. 385 |
| 2011 | Mei long Turner et al. p. 5 |
| 2011 | Mei long Zanno et al. p. 2 |
| 2012 | Mei long Gao et al. p. 3 figs. 2-7 |
| 2013 | Mei long Zanno et al. p. 517 |
| 2017 | Mei long van der Reest and Currie p. 920 |
| 2018 | Mei long Xing et al. p. 53 |
| 2020 | Mei long Yang et al. p. 2 |
| 2021 | Mei long Sellés et al. p. 8 |
| 2023 | Mei long Kubo et al. p. 7 |
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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.
†Mei long Xu and Norell 2004
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. -L. Gao et al. 2012 | Mei long is a troodontid with the following autapomorphies: Extremely large naris extending caudally over one-half of the maxillary tooth row [16]; closely packed middle maxillary teeth [16]; maxillary tooth row extending caudally to the level of the preorbital bar [16]; caudal portion of sacrum extremely wide with elongate 4th and 5th sacral processes; ilium strongly sigmoid in dorsal view, with a stronger lateral curve than in Velociraptor and Anchiornis; presence of a caudolateral flange on the midshaft of metatarsal IV [16]; the most proximal end of the pubic shaft significantly craniocaudally compressed relative to other troodontids [16]. Additionally, Mei long possesses the following combination of characters with a wider distribution: a bulbous and fully convex caudal portion of frontal and a short and steeply angled snout, features shared with Anchiornis and the Ukhaa Tolgod perinates (IGM 100/972 and 100/974) described as Byronosaurus [34], but perhaps representing a new taxon [35]; premaxilla with steeply inclined front and long maxillary process (shared with Ukhaa Tolgod perinates); maxilla, low with small, low maxillary fenestra and dorsoventrally short rostral process but thinner than in the Ukhaa Tolgod perinates; unserrated teeth as in Anchiornis and Ukhaa Tolgod perinates with straight distal margins as in Ukhaa Tolgod perinates, and Sinovenator but not Anchiornis; robust, sub-‘U’- shaped furculum more similar to those of oviraptorids; long ulna and radius approximately equal to or .90% of humeral length; metacarpal III longer than metacarpal II; unguals only moderately recurved compared to other maniraptorans; and distal articular surface of tibiotarsus large, continuing caudally on the tibia. |
Measurements
No measurements are available
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| Source: f = family, o = order | |||||
| References: Holtz et al. 2000, Marsh 1875 | |||||
Age range: base of the Late/Upper Barremian to the top of the Early/Lower Aptian or 130.00000 to 122.46000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Barremian - Early/Lower Aptian | China (Liaoning) | Mei long (type locality: 53493 133789) |