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Bagaceratops
Taxonomy
Bagaceratops was named by Maryanska and Osmólska (1975). Its type is Bagaceratops rozhdestvenskyi.
It was assigned to Protoceratopidae by Olshevsky and Ford (1994) and Tereshchenko and Alifanov (2003); to Bagaceratopidae by Alifanov (2003) and Alifanov (2008); to Bagaceratopsidae by Osi et al. (2010); to Neoceratopsia by Chinnery and Weishampel (1996), Chinnery and Weishampel (1998), Chinnery (2004), Chinnery and Horner (2007) and Lee et al. (2010); to Ceratopsoidea by Farke et al. (2014); to Coronosauria by Sereno (1986) and Zheng et al. (2015); and to Protoceratopsidae by Maryanska and Osmólska (1975), Bonaparte (1978), Ostrom and Wellnhofer (1986), Carroll (1988), Dodson and Currie (1990), Kurzanov (1992), Lehman (1996), Dodson (1997), Sereno (2000), Lambert et al. (2001), Makovicky (2001), You and Dodson (2003), Longrich et al. (2010), Czepiński (2019), Kim et al. (2019), Morschhauser et al. (2019) and Czepiński (2020).
It was assigned to Protoceratopidae by Olshevsky and Ford (1994) and Tereshchenko and Alifanov (2003); to Bagaceratopidae by Alifanov (2003) and Alifanov (2008); to Bagaceratopsidae by Osi et al. (2010); to Neoceratopsia by Chinnery and Weishampel (1996), Chinnery and Weishampel (1998), Chinnery (2004), Chinnery and Horner (2007) and Lee et al. (2010); to Ceratopsoidea by Farke et al. (2014); to Coronosauria by Sereno (1986) and Zheng et al. (2015); and to Protoceratopsidae by Maryanska and Osmólska (1975), Bonaparte (1978), Ostrom and Wellnhofer (1986), Carroll (1988), Dodson and Currie (1990), Kurzanov (1992), Lehman (1996), Dodson (1997), Sereno (2000), Lambert et al. (2001), Makovicky (2001), You and Dodson (2003), Longrich et al. (2010), Czepiński (2019), Kim et al. (2019), Morschhauser et al. (2019) and Czepiński (2020).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1975 | Bagaceratops Maryanska and Osmólska p. 148 |
| 1978 | Bagaceratops Bonaparte p. 466 |
| 1986 | Bagaceratops Ostrom and Wellnhofer p. 116 |
| 1986 | Bagaceratops Sereno |
| 1988 | Bagaceratops Carroll |
| 1990 | Bagaceratops Dodson and Currie p. 611 |
| 1992 | Bagaceratops Kurzanov p. 105 |
| 1994 | Bagaceratops Olshevsky and Ford |
| 1996 | Bagaceratops Chinnery and Weishampel p. 27A |
| 1996 | Bagaceratops Lehman p. 505 |
| 1997 | Bagaceratops Dodson p. 475 |
| 1998 | Bagaceratops Chinnery and Weishampel p. 578 fig. 10 |
| 2000 | Bagaceratops Sereno pp. 488-489 fig. 25.8 |
| 2001 | Bagaceratops Lambert et al. pp. 7, 18 |
| 2001 | Bagaceratops Makovicky p. 254 fig. 18.3 |
| 2003 | Bagaceratops Alifanov p. 527 |
| 2003 | Lamaceratops Alifanov p. 527 |
| 2003 | Platyceratops Alifanov p. 527 |
| 2003 | Lamaceratops Alifanov p. 528 fig. 2 |
| 2003 | Platyceratops Alifanov p. 532 fig. 2 |
| 2003 | Bagaceratops Tereshchenko and Alifanov p. 301 |
| 2003 | Bagaceratops You and Dodson |
| 2003 | Magnirostris You and Dong p. 299 figs. 1-2 |
| 2004 | Bagaceratops Chinnery pp. 584-585 fig. 9 |
| 2007 | Bagaceratops Chinnery and Horner p. 638 fig. 6 |
| 2008 | Bagaceratops Alifanov p. 621 |
| 2008 | Lamaceratops Alifanov p. 621 |
| 2008 | Magnirostris Alifanov p. 621 |
| 2008 | Platyceratops Alifanov p. 621 |
| 2008 | Gobiceratops Alifanov p. 622 |
| 2010 | Bagaceratops Lee et al. |
| 2010 | Bagaceratops Longrich et al. p. 955 |
| 2010 | Magnirostris Longrich et al. p. 955 |
| 2010 | Bagaceratops Osi et al. p. 467 |
| 2010 | Magnirostris Osi et al. p. 467 |
| 2014 | Bagaceratops Farke et al. |
| 2015 | Bagaceratops Zheng et al. p. 6 fig. 3 |
| 2019 | Bagaceratops Czepiński p. 11 |
| 2019 | Bagaceratops Kim et al. p. 187 |
| 2019 | Bagaceratops Morschhauser et al. p. 129 fig. 10 |
| 2019 | Magnirostris Morschhauser et al. p. 129 fig. 10 |
| 2020 | Bagaceratops Czepiński p. 485 |
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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. †Bagaceratops Maryanska and Osmólska 1975
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†Bagaceratops rozhdestvenskyi Maryanska and Osmólska 1975
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Invalid names: Gobiceratops minutus Alifanov 2008 [synonym], Lamaceratops tereschenkoi Alifanov 2003 [synonym], Magnirostris dodsoni You and Dong 2003 [synonym], Platyceratops tatarinovi Alifanov 2003 [synonym]
Invalid names: Gobiceratops Alifanov 2008 [synonym], Lamaceratops Alifanov 2003 [synonym], Magnirostris You and Dong 2003 [synonym], Platyceratops Alifanov 2003 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| V. R. Alifanov 2008 (Gobiceratops) | Tiny horned dinosaur, with large orbits and large lower temporal fenestrae. Preorbital region of skull short and low, and occipital region high and wide. Rostral bone absent. Antorbital fossae located under orbits; subnarial fenestrae located in line with their anterior margin, wider and slightly higher than nares. Supraoccipital large and wide. Dorsally, prefrontals lacking contact with frontals because of long posterior processes of nasals, which reaching orbital border. Nasal horn in shape of slightly projecting tubercle with wide base. Frontals with medially concave orbital borders and massive posterolateral processes. Nasofrontal suture V- or U-shaped. Postorbitals and parietal adjoining each other, excluding frontals from formation of border of upper temporal fenestrae. Parietal wide, with short medial crest in occipital part of bone. Fenestrae in parietal absent. Occipital process of maxillae long, reaching line of posterior orbital border. Quadratojugal process of jugals having well-pronounced crest with wide base. Quadratojugals large, open laterally. Dentaries lacking angular process. Surangulars and angulars approximately equal in area of lateral surface. Splenials reaching occipitally line of middle of adductor fossae. Each jaw with six functioning teeth. | |
| Ł. Czepiński 2019 | As for the type species. |
Measurements
No measurements are available
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| Source: g = genus, subo = suborder, o = order | |||||
| References: Norman and Weishampel 1991, Peczkis 1995, Marsh 1875 | |||||
Age range: Late/Upper Campanian or 83.50000 to 70.60000 Ma
Collections (16 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Campanian | Mongolia (Omnogov Aimag) | B. sp. (117932) | |
| Campanian | China (Nei Mongol) | B. sp. (68379) Magnirostris dodsoni (94372) | |
| Late/Upper Campanian | Mongolia (Omnogov) | B. sp. (53229 118259 127678) | |
| Late/Upper Campanian | Mongolia (Omnogov Aimak) | B. sp. (37184) | |
| Middle Campanian - Late/Upper Campanian | Mongolia (Omnogovi) | B. sp. (58105) | |
| Middle Campanian - Late/Upper Campanian | Mongolia (Omnogov) | B. rozhdestvenskyi (204919) B. sp. (130803 154402) Gobiceratops minutus, Breviceratops kozlowskii, B. rozhdestvenskyi (11582) Lamaceratops tereschenkoi (118256) Protoceratops sp. (13777 181414) | |
| Maastrichtian | Mongolia (Omnogov) | B. sp. (168983) |