Skull and atlas-axis complex of the Upper Jurassic sauropod Camarasaurus Cope (Reptilia: Saurischia)

Madsen, James H.; McIntosh, John S.; Berman, David S.

doi:10.5962/p.240778

Cited by 98 publications

(36 citation statements)

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“…This foramen is slightly medially divided, as occurred in Suuwassea and Europasaurus [44,55,56]. Note that cranial nerve II foramen is not medially divided but instead forms a single anterior foramen, as described for Shunosaurus [57], and Mamenchisaurus [58], but the division is much-limited compared with other later diverged sauropods such as Amargasaurus , Camarasaurus and Giraffatitan [50,52,59].…”

Section: Description and Comparisonmentioning

confidence: 93%

“…Open Sci. 9: 220794 that cranial nerve II foramen is not medially divided but instead forms a single anterior foramen, as described for Shunosaurus [57], and Mamenchisaurus [58], but the division is much-limited compared with other later diverged sauropods such as Amargasaurus, Camarasaurus and Giraffatitan [50,52,59]. The preserved right dentary is incomplete with the posterior-most portion missing, but all alveoli are completely preserved.…”

Section: Skull and Mandiblementioning

confidence: 98%

“…The suture of the exoccipital–opisthotic complex with the underlying basioccipital is invisible in occipital and lateral views. The paroccipital process (figure 3, pop) is ventrolaterally directed, at an angle that is higher than in Camarasaurus [50]. The hypoglossal nerve shares two foramina at the basal portion of the exoccipital–opisthotic complex that connects to the basipterygoid.…”

Section: Description and Comparisonmentioning

confidence: 99%

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New macronarian from the Middle Jurassic of Chongqing, China: phylogenetic and biogeographic implications for neosauropod dinosaur evolution

et al. 2022

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Macronaria is a clade of gigantic body-sized sauropod dinosaurs widely distributed from the Late Jurassic to the Late Cretaceous globally. However, its origin, early diversification, and dispersal are still controversial. Here, we report a new macronarian Yuzhoulong qurenensis gen. et sp. nov. excavated from the Middle Jurassic (Bathonian) Lower Shaximiao Formation. Yuzhoulong qurenensis bears a unique combination of features, such as two accessory fossae that exist on the posterior surface of dorsal diapophyses of anterior dorsal vertebrae. Results of phylogenetic analyses demonstrate it is one of the earliest-diverging macronarians. This new material represents a Middle Jurassic fossil record of macronarian sauropod worldwide and improves the understanding of the early diversity and dispersal of the Neosauropoda. This discovery further supports that sauropods achieved a more rapid and varied morphological diversity and palaeogeographical dispersal in the Middle Jurassic.

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Section: Description and Comparisonmentioning

confidence: 93%

Section: Skull and Mandiblementioning

confidence: 98%

Section: Description and Comparisonmentioning

confidence: 99%

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New macronarian from the Middle Jurassic of Chongqing, China: phylogenetic and biogeographic implications for neosauropod dinosaur evolution

et al. 2022

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“…It becomes rapidly thin and sharp anteroposteriorly as it extends ventrally. The crista prootica is weaker than the crista antotica and lacks a rugose surface, which is seen in Camarasaurus [Madsen et al 1995]), or a tablike (leaf-like) process, which is well developed in dicraeosaurids (Salgado and Calvo 1992;Upchurch 1998;Wilson 2002;Upchurch et al 2004a;Harris and Dodson 2004).…”

Section: Description and Comparisonsmentioning

confidence: 99%

“…These processes have been interpreted as articular facts for a single-headed cervical rib (Marsh 1896;Hatcher 1901;Holland 1905;Gilmore 1936). A distinct facet for a single-headed rib is present at the comparable location of the atlas as a pit or rugosity in Camarasaurus (Madsen et al 1995;McIntosh et al 1996a, Ikejiri et al 2005, and a presumable atlantal rib is closely associated with an atlas in GMNH-PV 101 (McIntosh et al 1996a). Gilmore (1933) and Mannion (2011) figured a similar flat surface on the posteroventral corner of the intercentrum of Mongolosaurus and the former author interpreted it as an articular facet for a cervical rib.…”

Section: Description and Comparisonsmentioning

confidence: 99%

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2014

Zootaxa

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A new genus and species of titanosauriform sauropod is erected based on a partial skeleton found in the Lower Cretaceous Sasayama Group of Hyogo Prefecture, SW Japan. The new taxon is here named as Tambatitanis amicitiae gen. et sp. nov., which is diagnosed by the following features of the caudal vertebrae, chevrons and braincase: the postzygapophysis and the summit of the neural spine of the anterior caudal vertebrae are located beyond the posterior border of the centrum, the spine of the anterior caudal vertebrae is curved strongly anteriorly and bow-shaped in lateral view, the summit of the neural spine is expanded and hemispherical with its anterior face excavated by the posterodorsal extension of a deep and narrow SPRF, the transverse process of the anterior caudal vertebrae are short and L shaped, the anterior chevron is the longest among sauropods in proportion to body size, the distal ends of the anterior chevrons are rod-shaped, the distal ends of the mid chevrons are transversely thin and anteroposteriorly long without cranial processes, and the dorsal border of the shaft of the paroccipital process that forms the ventral margin of the posttemporal fenestra is short mediolaterally and V-shaped in posterior view. A phylogenetic analysis suggests that T. amicitiae is a basal titanosauriform, possibly belonging to the East Asian endemic clade Euhelopodidae. The caudals and chevrons are described in detail in order to document highly autapomorphic features of the new taxon as well as potentially phylogenetically informative characters. The discovery of T. amicitiae suggests that East Asian basal titanosauriforms were diverse not only in the number of the taxa but also in the morphological variation of the caudal elements.

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Redescription of Brachiosaurid Sauropod Dinosaur Material From the Upper Jurassic Morrison Formation, Colorado, USA

D’Emic

Carrano

2019

The Anatomical Record

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Like many long‐standing dinosaur taxa, Brachiosaurus altithorax from the Upper Jurassic Morrison Formation of North America suffers from taxonomic issues stemming from a relatively incomplete holotype. Lack of anatomical overlap has precluded definitive referral of important specimens, including a mostly complete skull discovered in 1883. We redescribe this skull and some other significant brachiosaurid specimens based on new preparation and computed tomographic (CT) data. We argue that these elements are most parsimoniously referred to B. altithorax. Including these tentatively referred elements in a phylogenetic analysis does not alter the hypothesized relationships of B. altithorax, congruent with the presence of a single brachiosaurid taxon across western North America in the Late Jurassic. Based on CT data, we estimate that B. altithorax had a slower tooth replacement rate than Camarasaurus or the diplodocoids it shared Morrison Formation landscapes with, which suggests a difference in diet and/or feeding strategy. Anat Rec, 303:732–758, 2020. © 2019 Wiley Periodicals, Inc.

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Skull and atlas-axis complex of the Upper Jurassic sauropod Camarasaurus Cope (Reptilia: Saurischia)

Abstract: Cover illustration; Skull of Camarasaurus lentus CM 11338 with left mandibular ramus removed.

Cited by 98 publications

References 4 publications

New macronarian from the Middle Jurassic of Chongqing, China: phylogenetic and biogeographic implications for neosauropod dinosaur evolution

New macronarian from the Middle Jurassic of Chongqing, China: phylogenetic and biogeographic implications for neosauropod dinosaur evolution

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Redescription of Brachiosaurid Sauropod Dinosaur Material From the Upper Jurassic Morrison Formation, Colorado, USA

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