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Shuvuuia deserti
Taxonomy
Shuvuuia deserti was named by Chiappe et al. (1998). Its type specimen is MGI 100/975, a partial skeleton, and it is not a trace fossil. Its type locality is Ukhaa Tolgod (AMNH), which is in a Campanian eolian sandstone/mudstone in the Djadokhta Formation of Mongolia.
Synonymy list
| Year | Name and author |
|---|---|
| 1998 | Shuvuuia deserti Chiappe et al. |
| 1999 | Shuvuuia deserti Norell and Makovicky p. 11 |
| 2002 | Shuvuuia deserti Chiappe p. 452 |
| 2002 | Shuvuuia deserti Chiappe et al. p. 91 |
| 2002 | Shuvuuia deserti Suzuki et al. p. 2 |
| 2004 | Shuvuuia deserti Padian p. 211 |
| 2007 | Shuvuuia deserti Martinelli and Vera p. 14 fig. 11 |
| 2007 | Shuuvia deserti Turner et al. p. 24 |
| 2009 | Shuvuuia deserti Alifanov and Barsbold p. 95 |
| 2009 | Shuuvia deserti Bever and Norell p. 21 |
| 2009 | Shuvuuia deserti Longrich and Currie p. 246 |
| 2009 | Shuvuuia deserti Turner et al. p. 2 |
| 2010 | Shuvuuia deserti Choiniere et al. p. 573 fig. 2B |
| 2010 | Shuvuuia deserti Longrich et al. p. 955 |
| 2010 | Shuvuuia deserti Xu et al. p. 14 fig. 8 |
| 2011 | Shuvuuia deserti Gianechini et al. p. 285 |
| 2011 | Shuvuuia deserti Turner et al. p. 8 |
| 2013 | Shuvuuia deserti Xu et al. p. 25 |
| 2014 | Shuvuuia deserti Delcourt and Grillo p. 312 |
| 2018 | Shuvuuia deserti Norell et al. p. 2 |
| 2020 | Shuvuuia deserti Czepiński p. 490 |
| 2023 | Shuvuuia deserti Averianov et al. p. 69 |
| 2023 | Shuvuuia deserti Kubo et al. p. 2 |
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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.
†Shuvuuia deserti Chiappe et al. 1998
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. M. Chiappe et al. 1998 | A mononykine distinguished from Mononykus olecranus by its less compressed cervical centra with large pneumatic foramina, humeral deltopectoral crest that is continuous with its head, pubis of subcircular section, femoral and tibiotarsal shafts bowed latero–medially, and medial margin of astragalus’ ascending process less excavated. Shuvuuia deserti shows less co-ossification of the proximal tarsals to the tibia and among metacarpals in specimens of comparable size to the holotype of Mononyku solecranus, suggesting a lower rate of bone co-ossification. The new species differs from Parvicursor remotus because it lacks a ventral keel inthe most rostrally located synsacral vertebra and because it has less co-ossification between proximal tarsals and the tibia. Shuvuuia deserti differs from all alvarezsaurids because it has a sharp ridge on the medial margin of the distal tibiotarsus, a character that we have interpreted to be an autapomorphy (a novel character of a terminal taxon that evolved from an existing character). The skull of Shuvuuia deserti shows several charactersistics that we have interpreted as autapomorphies, including the articulation between quadrate and postorbital, the elongated basipterygoid processes, the numerous teeth, and the hypertrophied prefrontal/ectethmoid (see below for a discussion of the problematic interpretation of this bone). These characters, however, may prove to diagnose a more inclusive taxon after the discovery of additional alvarezsaurid cranial material. | |
| S. Suzuki et al. 2002 | Autapomorphic characters of Shuvuuia deserti include an articulation between the
quadrate and postorbital, elongated basipterygoid processes, hypertrophied prefrontal/ectethmoid, and the presence of a sharp ridge on the medial margin of the distal tibiotarsus (Chiappe et al., 1998). This taxon is differentiated from the closely related mononykine Mononykus olecranus because it has less compressed cervical centra that bear large pneumatic foramina, a humeral head that is continuous with the deltopectoral crest, a pubis of subcircular section, femoral and tibiotarsal shafts that are bowed lateromedially, and a medial margin of the ascending process of the astragalus that is less excavated (Chiappe et al., 1998). The pes of Shuvuuia deserti also has a much longer proximal phalanx of the hallux than that of Mononykus olecranus, an intermediate phalanx of digit II subequal in length to its ungual phalanx (instead of much shorter as in Mononykus olecranus), and longer and more slender intermediate phalanges of digit IV. Shuvuuia deserti is differentiated from the poorly known mononykine Parvicursor remotus because pedal digit IV in Shuvuuia deserti is longer than half the length of metatarsal IV (in Parvicursor remotus, digit IV is less than half of metatarsal IV) and this digit is shorter than digit II (without counting ungual phalanges). Shuvuuia deserti also lacks the ventral keel in the most rostrally located synsacral vertebra and has less coossification between the proximal tarsals and the tibia (Chiappe et al., 1998). | |
| L. M. Chiappe et al. 2002 | Very similar to M. olecranus but differs in having cervical centra that are less compressed laterally and bearing large pneumatic foramina; deltopectoral crest of humerus continuous with humeral head; a pubis of subcircular section; femoral and tibiotarsal shafts bowed mediolaterally; medial border of distal end of tibiotarsus with a sharp ridge; medial margin of the ascending process of the astragalus less notched; much longer proximal phalanx of the hallux; an intermediate phalanx of digit II similar in length to its ungual (instead of much shorter as in M. olecranus), and longer and more slender intermediate phalanges of digit IV and lesser degree of co-ossificatioin of proximal tarsals and metacarpals, suggesting a size larger than M. olecranus. S. deserti differs from P. remotus because pedal digit IV is longer than half the length of metatarsal IV (in P. remotus, digit IV is less than half of metatarsal IV) and this digit is shorter than digit II (without counting ungual phalanges). |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Benton 1983, Marsh 1875 | |||||
Age range: Campanian or 83.60000 to 72.20000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Campanian | Mongolia (Omnogov) | Mononykus sp. (129749) | |
| Late/Upper Campanian | Mongolia (Omnogov) | Mononychus olecranus (51033) Mononykus olecranus (type locality: 37184) |