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Albinykus baatar
Taxonomy
Albinykus baatar was named by Nesbitt et al. (2011). Its type specimen is IGM 100/3004, a set of limb elements, and it is a 3D body fossil. Its type locality is Khugenetjavkhlant, which is in a Santonian/Campanian alluvial fan sandstone in the Javkhlant Formation of Mongolia.
Synonymy list
| Year | Name and author |
|---|---|
| 2011 | Albinykus baatar Nesbitt et al. |
| 2012 | Albinykus baatar Agnolin et al. p. 47 |
| 2023 | Albinykus baatar Averianov et al. p. 69 |
| 2023 | Albinykus baatar Kubo et al. p. 25 |
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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.
†Albinykus baatar Nesbitt et al. 2011
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. J. Nesbitt et al. 2011 | Albinykus is placed within Alvarezsauridae based on the derived presence of the following characters (see Phylogenetic Results): an extreme arctometatarsalian condition with metatarsal III abbreviated and excluded from the proximal surface (character 203(3) of Turner et al., 2007), and the anterior surface of metatarsal III concave (character 69(1) of Longrich and Currie, 2009). We use the stem definition of Alvarezsauroidea (Bonaparte, 1991) and the node defintion of Alvarezsauridae (Bonaparte, 1991) following Choiniere et al. (2010).
The combination of the following unique character state combination within the clade further differentiates the new taxon: a short metatarsal I with a rounded proximal tip (unknown in Alvarezsaurus and Patagonykus); well-pronounced and knob-likecrest for attachment of the M. iliofibularis on the fibula proportionally larger than other alvarezsaurids; phalanx IV-4 longer than both IV-2 and IV-3; and the presence of a deep groove on the anterior face of the ascending process of the astragalus. A small flange on the lateral side of the distal end of metatarsal IV is shared exclusively with Parvicursor, Shuvuuia, and Mononykus within Alvarezsauridae. Albinykus differs from all other alvarezsaurids by the presence of complete fusion between the tibia and proximal tarsals but because little is known about alvarezsaurid ontogeny, we elect to exclude this character state from the main body of the diagnosis. Fusion of the distal tarsals to the metatarsals and of the proximal portions of the metatarsals to each other are also noteworthy in the new taxon. However, metatarsal fusions slightly vary between the right and left leg of the new specimen. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Marsh 1875, Benton 1983 | |||||
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Santonian - Campanian | Mongolia (Dornogov) | Albinykus baatar (type locality: 80183) |