| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Haplocheirus sollers
Taxonomy
Haplocheirus sollers was named by Choiniere et al. (2010). Its type specimen is IVPP V15988, a skull (femur), and it is a 3D body fossil. Its type locality is Wucaiwan area Sino-American expedition - orange mudstone beds, which is in an Oxfordian terrestrial mudstone in the Shishugou Formation of China.
Synonymy list
| Year | Name and author |
|---|---|
| 2010 | Haplocheirus sollers Choiniere et al. pp. 571, 573 fig. 1 |
| 2011 | Haplocheirus sollers Nesbitt et al. p. 148 |
| 2013 | Haplocheirus sollers Novas et al. p. 195 |
| 2014 | Haplocheirus sollers Choiniere et al. p. 3–5 |
| 2023 | Haplocheirus sollers Averianov et al. p. 67 |
| 2023 | Haplocheirus sollers Kubo et al. p. 7 |
Is something missing? Join the Paleobiology Database and enter the data
|
|
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.
†Haplocheirus sollers Choiniere et al. 2010
show all | hide all
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. N. Choiniere et al. 2010 | Large alvarezsauroid with the following autapomorphies: accessory mandibular fenestra anterodorsal to the mandibular fenestra, fenestrae divided by posterior process of the dentary; metacarpal III one-half the length of metacarpal II. Differs from all other alvarezsauroids in the following derived features: heterodont dentary tooth row with enlarged dentary tooth 4; alveolar margin of anterior end of dentary is dorsally convex; maxillary and dentary teeth with posterior serrations. Plesiomorphic in the Alvarezsauroidea for the following characters: postorbital contacts the jugal to form a postorbital bar; recurved maxillary and dentary teeth with serrations; distal carpals not fused to metacarpals; manual digit III longer than digit II; manual digits III and IV bear recurved unguals; pubis projects anteroventrally; ventral surface of sacrum without keel; posterior surface of last sacral centrum flat. | |
| J. N. Choiniere et al. 2014 | Differs from all other theropods in: ventral edge of the distal end of the paroccipital processes twisted posteriorly; metacarpal III one-half the length of metacarpal II. Differs from all other alvarezsauroids in the following derived cranial features: dorsally expanded distal end of the jugal process of the maxilla; heterodont dentary tooth row with enlarged tooth in the 4th alveolus; alveolar margin of anterior end of dentary dorsally convex; maxillary and dentary teeth with serrations on distal carinae. Additional research on the holotype skull indicates that a second mandibular fenestra, considered by Choiniere et al. (2010b) as an autapomorphy of Haplocheirus, is a preservational artifact. |
Measurements
| part | N | mean | |||||
|---|---|---|---|---|---|---|---|
| femur diameter | 1 | 17.5 | |||||
| humerus diameter | 1 | 13.0 |
|
|
||||
|
|
||||
|
|
||||
|
|
||||
|
|
||||
|
|||||
|
|
||||
|
|
||||
|
|
||||
| Source: subo = suborder, o = order | |||||
| References: Marsh 1875, Benton 1983 | |||||