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Bactrosaurus johnsoni
Taxonomy
Bactrosaurus johnsoni was named by Gilmore (1933). Its type specimen is AMNH 6553, a partial skeleton, and it is a 3D body fossil. Its type locality is Johnson Quarry, Iren Dabasu, which is in a Campanian/Campanian fluvial-lacustrine horizon in the Iren Dabasu Formation of China.
It was considered a nomen dubium by Dalla Vecchia (2014).
It was considered a nomen dubium by Dalla Vecchia (2014).
Synonymy list
Year | Name and author |
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1933 | Bactrosaurus johnsoni Gilmore p. 50 figs. 21-40 |
1935 | Bactrosaurus johnsoni Young |
1939 | Bactrosaurus johnsoni Riabinin p. 15 |
1944 | Bactrosaurus johsoni Young p. 201 |
1951 | Bactrosaurus johnsoni Chow p. 93 |
1958 | Bactrosaurus johnsoni Young pp. 110-111 |
1960 | Bactrosaurus johnsoni Langston p. 351 |
1964 | Bactrosaurus johnsoni Kuhn p. 15 |
1964 | Bactrosaurus johnsoni Tatarinov p. 561 |
1965 | Bactrosaurus johnsoni Rozhdestvensky |
1967 | Bactrosaurus johnsoni Charig p. 716 |
1974 | Bactrosaurus johnsoni Rozhdestvensky p. 147 |
1975 | Bactrosaurus johnsoni Taquet p. 507 |
1977 | Bactrosaurus johnsoni Rozhdestvensky p. 113 |
1979 | Bactrosaurus johnsoni Brett-Surman p. 561 |
1980 | Bactrosaurus johnsoni Chao |
1981 | Bactrosaurus johnsoni Maryanska and Osmólska p. 8 |
1983 | Bactrosaurus johnsoni Weishampel and Weishampel p. 44 |
1984 | Bactrosaurus johnsoni Brinkmann p. 302 fig. 4 |
1984 | Bactrosaurus johnsoni Cheng p. 212 |
1986 | Bactrosaurus johnsoni Li et al. p. 134 |
1986 | Bactrosaurus johnsoni Yu and Qi p. 164 |
1986 | Bactrosaurus johnsoni Zhao p. 71 |
1990 | Bactrosaurus johnsoni Weishampel and Horner p. 557 |
1991 | Bactrosaurus johnsoni Weishampel et al. p. 204 |
1992 | Bactrosaurus johnsoni Dong p. 166 |
1993 | Bactrosaurus johnsoni Currie and Eberth p. 138 |
1994 | Bactrosaurus johnsoni Matsukawa and Obata p. 113 |
1998 | Bactrosaurus johnsoni Godefroit et al. p. 8 |
1999 | Bactrosaurus johnsoni Casanovas et al. p. 352 |
2004 | Bactrosaurus johnsoni Godefroit et al. p. 147 |
2004 | Bactrosaurus johnsoni Horner et al. p. 439 |
2006 | Bactrosaurus johnsoni Lund and Gates p. 270 |
2006 | Bactrosaurus johnsoni Prieto-Márquez et al. p. 938 |
2007 | Bactrosaurus johnsoni Gilpin et al. p. 80 |
2007 | Bactrosaurus johnsoni Paul p. 72 fig. 4.2 |
2008 | Bactrosaurus johnsoni Godefroit et al. p. 65 |
2009 | Bactrosaurus johnsoni Kim et al. p. 1394 |
2009 | Bactrosaurus johnsoni Pereda-Suberbiola et al. p. 568 |
2010 | Bactrosaurus johnsoni Godefroit and Motchurova-Dekova p. 165 |
2010 | Bactrosaurus johnsoni Juárez Valieri et al. p. 221 |
2010 | Bactrosaurus johnsoni McDonald et al. p. 33 fig. 39 |
2010 | Bactrosaurus johnsoni McDonald et al. p. 808 fig. 10 |
2010 | Bactrosaurus johnsoni Prieto-Marquez p. 853 |
2010 | Bactrosaurus johnsoni Prieto-Marquez and Salinas p. 816 |
2010 | Bactrosaurus johnsoni Prieto-Márquez p. 3 |
2010 | Bactrosaurus johnsoni Prieto-Márquez and Norell p. 6 |
2010 | Bactrosaurus johnsoni Prieto-Márquez and Wagner p. 1241 |
2011 | Bactrosaurus johnsoni Godefroit et al. p. 181 |
2011 | Bactrosaurus johnsoni Prieto-Márquez p. 62 |
2011 | Bactrosaurus johnsoni Wang et al. p. 137 |
2012 | Bactrosaurus johnsoni Averianov and Alifanov p. 518 |
2012 | Bactrosaurus johnsoni Godefroit et al. p. 15 |
2012 | Bactrosaurus johnsoni Prieto-Márquez p. 526 |
2012 | Bactrosaurus johnsoni Ramírez-Velasco et al. p. 389 |
2013 | Bactrosaurus johnsoni Cruzado-Caballero et al. |
2013 | Bactrosaurus johnsoni Gasca et al. p. 72 |
2013 | Bactrosaurus johnsoni Zheng et al. |
2014 | Bactrosaurus johnsoni Prieto-Márquez p. 299 |
2014 | Bactrosaurus johnsoni Tsogtbaatar et al. p. 115 |
2014 | Bactrosaurus johnsoni Xing et al. p. 1818 |
2015 | Bactrosaurus johnsoni Ohashi et al. p. 4 |
2015 | Bactrosaurus johnsoni Tan et al. p. 249 |
2016 | Bactrosaurus johnsoni Prieto-Márquez et al. p. 10 |
2016 | Bactrosaurus johnsoni Prieto-Márquez and Gutarra p. 144 |
2017 | Bactrosaurus johnsoni Bertozzo et al. p. 20 |
2017 | Bactrosaurus johnsoni Cruzado-Caballero and Powell p. 3 |
2018 | Bactrosaurus johnsoni Fondevilla et al. p. 9 |
2018 | Bactrosaurus johnsoni Gates et al. p. 5 |
2019 | Bactrosaurus johnsoni Takasaki et al. p. 3 |
2020 | Bactrosaurus johnsoni Dalla Vecchia p. 611 |
2021 | Bactrosaurus johnsoni Kobayashi et al. p. 9 |
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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.
†Bactrosaurus johnsoni Gilmore 1933
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Diagnosis
Reference | Diagnosis | |
---|---|---|
C. W. Gilmore 1933 | GENERIC AND SPECIFIC CHARACTERS.—Dentition reduced, twenty-three vertical rows of teeth in dentary, twenty-eight in maxillary. Posterior dorsal vertebra with tall spines, club-shaped. Sacrum with seven coössified vertebrae. Ilium strongly arched, preacetabular process decurved; ischium stout with expanded foot-like end. Pubis short with greatly expanded blade. Terminal phalanges of pes with thickened truncate anterior borders. | |
P. Godefroit et al. 1998 | Non-hadrosaurid Hadrosauroidea characterized by the long and rounded rostral processes of its jugal, bearing a very elongated and excavated maxillary facet (1); caudal process of the jugal rather narrow (2); postcotyloid process of squamosal markedly curved backwards (3); club-shaped neural spines of the last dorsal vertebrae, in fully ossified adult specimens (4); distal blade of the scapula very regularly widening towards its end, ratio "length of the scapula / maximal width of the distal blade" < 3.5 (5); promiment and angular deltopectoral crest of the humerus (6); ulnar condyle of the humerus distinctly more developed than radial condyle (7); preacetabular process of the ilium very deflected ventrally (8); ischial shaft very thick and ischial foot greatly expanded (9); femur perfectly straight in lateral view (10); ungual phalanges thick and truncated in adults (11).
The following characters are considered to be plesiomorphic in Bactrosaurus johnsoni: maxilla markedly asymmetrical in lateral view (12); about 20 maxillary and dentary tooth positions in adults (13); laterally positioned antorbital fenestra (14); paraquadrate foramen developed (15); massive supraorbitals (16); dentary rostrally downturned (17); dentary teeth bearing one caudal secondary ridge (18); large pubic peduncle (19) and simple ischial peduncle of ilium (20). |