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Yangchuanosaurus
Taxonomy
Yangchuanosaurus was named by Dong et al. (1978).
It was synonymized subjectively with Metriacanthosaurus by Paul (1988).
It was assigned to Allosauridae by Molnar et al. (1981), Carroll (1988) and Dong (1992); to Carnosauria by Molnar et al. (1990) and Russell and Dong (1994); to Allosauroidea by Dong (1997); to Sinraptoridae by Sereno et al. (1994), Currie and Zhao (1994), Hutt et al. (1996), Hutchinson and Padian (1997), Sereno (1997), Holtz (2000), Rauhut (2003), Holtz et al. (2004), Buffetaut et al. (2006) and Naish and Martill (2007); to Megalosauridae by Dong et al. (1978), Dong et al. (1983), Kurzanov (1989), Gao (1992), Gao (1999), Peng et al. (2005) and Li et al. (2011); and to Metriacanthosauridae by Carrano et al. (2012).
It was synonymized subjectively with Metriacanthosaurus by Paul (1988).
It was assigned to Allosauridae by Molnar et al. (1981), Carroll (1988) and Dong (1992); to Carnosauria by Molnar et al. (1990) and Russell and Dong (1994); to Allosauroidea by Dong (1997); to Sinraptoridae by Sereno et al. (1994), Currie and Zhao (1994), Hutt et al. (1996), Hutchinson and Padian (1997), Sereno (1997), Holtz (2000), Rauhut (2003), Holtz et al. (2004), Buffetaut et al. (2006) and Naish and Martill (2007); to Megalosauridae by Dong et al. (1978), Dong et al. (1983), Kurzanov (1989), Gao (1992), Gao (1999), Peng et al. (2005) and Li et al. (2011); and to Metriacanthosauridae by Carrano et al. (2012).
Synonymy list
| Year | Name and author |
|---|---|
| 1978 | Yangchuanosaurus Dong et al. |
| 1981 | Yangchuanosaurus Molnar et al. p. 144 |
| 1983 | Yangchuanosaurus Dong et al. pp. 67-68 |
| 1988 | Yangchuanosaurus Carroll |
| 1989 | Yangchuanosaurus Kurzanov p. 4 |
| 1990 | Yangchuanosaurus Molnar et al. p. 192 |
| 1992 | Yangchuanosaurus Dong p. 79 |
| 1992 | Yangchuanosaurus Gao p. 323 |
| 1994 | Yangchuanosaurus Currie and Zhao |
| 1994 | Yangchuanosaurus Russell and Dong p. 2125 |
| 1994 | Yangchuanosaurus Sereno et al. p. 270 |
| 1996 | Yangchuanosaurus Hutt et al. p. 642 |
| 1997 | Yangchuanosaurus Dong p. 122 |
| 1997 | Yangchuanosaurus Hutchinson and Padian p. 96 |
| 1997 | Yangchuanosaurus Sereno p. 456 |
| 1999 | Yangchuanosaurus Gao |
| 2000 | Yangchuanosaurus Holtz, Jr. p. 21 fig. 5 |
| 2003 | Yangchuanosaurus Rauhut p. 27 |
| 2004 | Yangchuanosaurus Holtz, Jr. et al. p. 74 |
| 2005 | Yangchuanosaurus Peng et al. |
| 2006 | Yangchuanosaurus Buffetaut et al. p. 25 |
| 2007 | Yangchuanosaurus Naish and Martill p. 502 |
| 2011 | Yangchuanosaurus Li et al. p. 24 |
| 2012 | Yangchuanosaurus Carrano et al. p. 248 fig. 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.
G. †Yangchuanosaurus Dong et al. 1978
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†Yangchuanosaurus shangyouensis Dong et al. 1978
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Invalid names: Yangchuanosaurus magnus Dong et al. 1983 [synonym]
†Yangchuanosaurus zigongensis Gao 1993
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| Z. Dong et al. 1983 | A relatively large megalosaurid that may exceed eight meters in length. Skull is robust with a moderate height-length ratio and with six pairs of fenestrae. Maxilla possesses one or two depressions. Prefrontal is robust and represents a strong supraorbital ridge. Parietal process is high, well developed, and projected dorsally. Frontal and parietal are fused while the quadrate is straight. Maxillary and mandibular dentition are robust, laterally compressed, and slightly posteriorly recurved. Premaxillary dentition is subrounded in cross-section and incipiently incisiform. Anterior and posterior carinae bear small picketed denticles. These teeth arebasically megalosaurian in nature. Dentition formula is premaxilla: 4, Maxilla: 10-14, Dentary 14-15. There are five sacral and 23 presacral vertebrae comprising 10 cervicals and 13 dorsals. Cervicals are opisthocoelous, and ventrally oblique with a weak ventral keel. Dorsal vertebrae are amphiplatyan with plate-shaped neural spines. The five sacral vertebrae are fused as are the first four anterior spines which form a single plate. Caudal vertebrae are amphicoelous with high neural spines. The pelvic girdle is robust with a low ilium that is anteroposteriorly elongated. The preacetabular process is broad, pubic and ischial shafts are fused, there is a generally well formed pubic boot, and an obturator foramen is large and circular. The femur is curved and slightly longer than the tibia. | |
| G. Peng et al. 2005 | Large-sized megalosaur 7~10 m of body length. It is characterized by large but narrow skull with its width less than 1/3 of its length; 6 pairs of big external cranial openings and 1~2 maxillary fossa in skull; parietal process developed; frontals co-ossified with parietal; supraoccipital with developed dorsal keel; straight quadrate; quadratojugal with slender and elongate dorsal process; posterior end of dentary obviously bifurcated; large external mandibular foramen; premaxillary teeth with subcircular in cross section; compressed maxillary and dentary teeth with serrated anterior and posterior margins; dental formula Pm4 + M13~15 / D14~16; 9~10 opisthocoelous cervicals; posterior cervical centra with ventral keel; 13~14 opisthocoelous-amphiplatyan dorsals; high and plate-like dorsal neural spines; 5 sacrals with firmly co-ossified centra and neural spines; amphicoelous caudals; anterior caudals with high and plate-like neural spines; middle and posterior caudals with elongate prezygapophyses; moderate scapular shaft; massive pelvic girdle; both shafts of pubis and ischium co-ossified; distal end of pubis with a foot-like process; distal end of ischium expanded but lacking a foot-like process; femoral shaft bent, longer than tibia; and ascending process of astragalus undeveloped. |