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Beipiaosaurus inexpectus
Taxonomy
Beipiaosaurus inexpectus was named by Xu et al. (1999). Its type specimen is IVPP 11559, a skull (femur), and it is a compression preserving soft parts. Its type locality is Sihetun, lower Yixian (general), which is in a Barremian/Aptian lacustrine shale/siltstone in the Yixian Formation of China. It is the type species of Beipiaosaurus.
Synonymy list
| Year | Name and author |
|---|---|
| 1999 | Beipiaosaurus inexpectus Wang et al. p. 459 |
| 1999 | Beipiaosaurus inexpectus Xu et al. p. 351 figs. 1-2 |
| 2002 | Beipiaosaurus inexpectus Yao et al. p. 221 |
| 2003 | Beipiaosaurus inexpectus Currie p. 56 |
| 2003 | Beipiaosaurus inexpectus Rauhut p. 41 |
| 2003 | Beipiaosaurus inexpectus Ruiz-Omeñaca and Canudo p. 296 |
| 2004 | Beipiaosaurus inexpectus Clark et al. p. 152 |
| 2006 | Beipiaosaurus inexpectus Zanno p. 637 |
| 2009 | Beipiaosaurus inexpectus Xu et al. p. 832 |
| 2009 | Beipiaosaurus inexpectus Zanno et al. p. S15 |
| 2010 | Beipiaosaurus inexpectus Zanno p. 197 |
| 2012 | Beipiaosaurus inexpectatus Qian et al. p. 341 |
| 2012 | Beipiaosaurus inexpectus Senter et al. p. 1 |
| 2012 | Beipiaosaurus inexpectus Xing et al. p. 503 |
| 2013 | Beipiaosaurus inexpectus Pu et al. |
| 2019 | Beipiaosaurus inexpectus Liao and Xu p. 119 |
| 2019 | Beipiaosaurus inexpectus You et al. p. 8 |
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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.
†Beipiaosaurus inexpectus Xu et al. 1999
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. E. Zanno 2010 | A therizinosaurian bearing the following autapomorphies: elongate lateral articular surface on manual phalanx I-I (Xu et al. 1999b); obturator process of ischium sinusoidal, with ventrally deflected distal portion; ischial boot approximately twice craniocaudal depth of distal shaft; low ridge on cranial femoral shaft extending proximally from medial condyle. Possession of four fused caudal dorsals and a pygostyle incorpo- rating up to seven caudal vertebrae may also be autapomorphic for this species, as well as the presence of a prominent triangular flange extending from ventrolateral surface of metacarpal I, which although found on other theropod taxa is likely of autapomorphic morphology in Beipiaosaurus and may be homologous with rectangular buttress on advanced taxa. | |
| C.-C. Liao and X. Xu 2019 | (from cranium only) A small therizinosaurian distinguishable from
other therizinosaurians in having the following cranial autapomorphies: postorbital process of frontal large and abruptly transits from orbital rim, parietal with a long and sharp anterior process, ventral ramus of parietal squamosal process extremely long, and external mandibular fenestra deep dorsoventrally and extremely posteriorly located. |
Measurements
No measurements are available
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| Source: superf = superfamily, o = order | |||||
| References: Holtz et al. 2000, Kiessling 2004, Marsh 1875 | |||||
Age range: base of the Late/Upper Barremian to the top of the Early/Lower Aptian or 125.77000 to 119.57000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Barremian - Early/Lower Aptian | China (Liaoning) | Beipiaosaurus inexpectus (type locality: 52888) |