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Bagaceratops rozhdestvenskyi
Taxonomy
Bagaceratops rozhdestvenskyi was named by Maryanska and Osmólska (1975). Its type specimen is ZPAL MgD-I/126, a skeleton, and it is not a trace fossil. Its type locality is Khermeen Tsav I, Red Beds [PMPE], which is in a Campanian/Campanian eolian sandstone in the Baruungoyot Formation of Mongolia. It is the type species of Bagaceratops.
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1975 | Bagaceratops rozhdestvenskyi Maryanska and Osmólska p. 148 figs. Pl. 42-49; Figs. 6-14 |
| 1977 | Bagaceratops rozhdestvenskyi Gradzinski et al. p. 302 |
| 1980 | Bagaceratops rozhdestvenskyi Coombs p. 381 |
| 1982 | Bagaceratops rozhdestvenskyi Coombs, Jr. p. 102 |
| 1990 | Bagaceratops rozhdestvenskyi Dodson and Currie p. 611 |
| 1994 | Bagaceratops rozhdestvenskyi Dong and Currie p. 2252 |
| 1996 | Bagaceratops rozhdestvenskyi Lehman p. 505 |
| 1997 | Bagaceratops rozhdestvenskyi Barsbold p. 449 |
| 1997 | Bagaceratops rozhdestvenskyi Osmólska p. 41 |
| 2000 | Bagaceratops rozhdestvenskyi Sereno pp. 488-489 |
| 2001 | Bagaceratops rozhdestvenskyi Lambert et al. p. 5 |
| 2001 | Bagaceratops rozhdestvenskyi Makovicky p. 254 fig. 18.3 |
| 2003 | Lamaceratops tereschenkoi Alifanov p. 528 fig. 2 |
| 2003 | Platyceratops tatarinovi Alifanov p. 532 fig. 2 |
| 2003 | Bagaceratops rozhdestvenskyi Tereshchenko and Alifanov p. 301 |
| 2003 | Magnirostris dodsoni You and Dong p. 299 figs. 1-2 |
| 2004 | Bagaceratops rozhdestvenskyi Chinnery p. 584 |
| 2004 | Bagaceratops rozhdestvenskyi You and Dodson p. 479 |
| 2007 | Bagaceratops rozhdestvenskyi You et al. p. 899 |
| 2008 | Bagaceratops rozhdestvenskyi Alifanov p. 621 |
| 2008 | Lamaceratops tereschenkoi Alifanov p. 621 |
| 2008 | Magnirostris dodsoni Alifanov p. 621 |
| 2008 | Platyceratops tatarinovi Alifanov p. 621 |
| 2008 | Gobiceratops minutus Alifanov pp. 622-623 figs. 1; Pl. 4 |
| 2008 | Magnirostris dodsoni Godefroit et al. p. 432 |
| 2010 | Bagaceratops rozhdestvenskyi Lee et al. |
| 2010 | Bagaceratops rostdestvenskii Longrich et al. p. 955 |
| 2010 | Magnirostris dodsoni Longrich et al. p. 955 |
| 2010 | Bagaceratops rozhdestvenskyi Osi et al. p. 466 |
| 2010 | Magnirostris dodsoni Osi et al. p. 466 |
| 2010 | Gobiceratops minutus Xu et al. p. 13 |
| 2010 | Lamaceratops tereschenkoi Xu et al. p. 13 |
| 2010 | Magnirostris dodsoni Xu et al. p. 13 |
| 2010 | Platyceratops tatarinovi Xu et al. p. 13 |
| 2012 | Bagaceratops rozhdestvenskyi Handa et al. p. 180 |
| 2014 | Bagaceratops rozhdestvenskyi Arbour et al. p. 649 |
| 2014 | Bagaceratops rozhdestvenskyi Hone et al. p. 11 |
| 2017 | Magnirostris dodsoni Chen p. 154 |
| 2019 | Bagaceratops rozhdestvenskyi Czepiński p. 12 |
| 2019 | Bagaceratops rozhdestvenskyi Herne et al. p. 568 |
| 2019 | Gobiceratops minutus Kim et al. p. 182 |
| 2019 | Bagaceratops rozhdestvenskyi Kim et al. p. 183 |
| 2019 | Bagaceratops rozhdestvenskyi Morschhauser et al. p. 37 |
| 2019 | Magnirostris dodsoni Morschhauser et al. p. 135 |
| 2020 | Bagaceratops rozhdestvenskyi Czepiński p. 485 |
| 2022 | Bagaceratops rozhdestvenskyi Son et al. p. 3 |
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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.
†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]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| Ł. Czepiński 2019 | I confirm the following set of distinct features listed earlier (Maryanska and Osmólska 1975; Makovicky 2002) as diagnostic for Bagaceratops rozhdestvenskyi: well-developed accessory antorbital fenestra similar in size and shape to the external nares with restricted but present contact with the nasal (autapomorphy), fused nasals with the prominent trapezoidal horncore present in even the smallest specimens (autapomorphy), sharp buccal crest of the dentary (autapomorphy) and deeply bifurcated splenials (autapomorphy).
All specimens of Bag. rozhdestvenskyi have an elongated maxillary diastema, longer than 30% of the teeth row, and lack of the angular process of the dentary at the caudoventral region of the bone, features seen only in a few specimens of Protoceratops spp. Among Protoceratopsidae, Bag. rozhdestvenskyi shares the edentulous premaxilla with Protoceratops hellenikorhinus and the presence of the accessory antorbital fenestra with Breviceratops kozlowskii. |
Measurements
No measurements are available
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| Source: g = genus, subo = suborder, o = order | |||||
| References: Peczkis 1995, Norman and Weishampel 1991, Marsh 1875 | |||||
Age range: base of the Middle Campanian to the top of the Campanian or 83.50000 to 72.10000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Campanian | China (Nei Mongol) | Magnirostris dodsoni (94372) | |
| Middle Campanian - Late/Upper Campanian | Mongolia (Omnogov) | Bagaceratops rozhdestvenskyi (204919) Gobiceratops minutus, Breviceratops kozlowskii, Bagaceratops rozhdestvenskyi (11582) Lamaceratops tereschenkoi (118256) Protoceratops sp. (type locality: 13777 181414) |