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Diplodocidae

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Diplodocids, or members of the family Diplodocidae ("double beams"), are a group of sauropod dinosaurs. The family includes some of the longest creatures ever to walk the Earth, including Diplodocus and Supersaurus, some of which may have reached lengths of up to 42 metres (138 ft).[3][2]

Diplodocids
Temporal range: Middle Jurassic-Early Cretaceous, 170–136.4 Ma
Mounted A. louisae (specimen CM 3018), Carnegie Museum of Natural History
Mounted D. carnegii type specimen, Carnegie Museum of Natural History
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: †Sauropodomorpha
Clade: †Sauropoda
Superfamily: †Diplodocoidea
Clade: †Flagellicaudata
Family: †Diplodocidae
Marsh, 1884
Type genus
†Diplodocus
Marsh, 1878
Subgroups[2]
Synonyms
  • Atlantosauridae
    Marsh, 1877
  • Amphicoeliidae
    Cope, 1878
  • Apatosauridae
    Huene, 1927
  • Brontosauridae
    Jaekel, 1911

Description

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Diplodocus, depicted with spines limited to the mid-line of the back

Diplodocids were generally large animals, even by sauropod standards. Thanks to their long necks and tails, diplodocids were among the longest sauropods, with some species such as Supersaurus vivianae and Diplodocus hallorum estimated to have reached lengths of 30 meters (100 ft) or more.[3] The heaviest diplodocids, such as Supersaurus and Apatosaurus, may have weighed close to 40 tonnes.[3][4][5] However, not all diplodocids were so large; the South American species Leinkupal laticauda was one of the smallest diplodocids, with an estimated length of only 9 meters (30 ft).[6]

Their heads, like those of other sauropods, were tiny with the nasal openings on the top of the head (though in life the nostrils themselves would have been close to the tip of the snout[7]).

The heads of diplodocids have been widely depicted with the nostrils on top due to the position of the nasal openings at the apex of the skull. There has been speculation over whether such a configuration meant that diplodocids may have had a trunk.[8] A 2006 study surmised there was no paleoneuroanatomical evidence for a trunk.[9] It noted that the facial nerve in an animal with a trunk, such as an elephant, is large as it innervates the trunk. The evidence suggests that the facial nerve is very small in diplodocids. Studies by Lawrence Witmer (2001) indicated that, while the nasal openings were high on the head, the actual, fleshy nostrils were situated much lower down on the snout.[7]

Diplodocids had long necks, which could reach an estimated length of 15 metres (50 ft) in the largest, longest-necked species.[10] The neck was typically composed of 15 vertebrae, though in Barosaurus, the neck probably had 16 vertebrae as the result of the incorporation of an additional vertebra from the dorsal series.[11] The habitual neck posture of diplodocids is controversial; studies have proposed postures ranging from nearly straight and below horizontal[12] to an S-curve that reaches vertical.[13]

Distinguishing anatomical features

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Diplodocid heads have historically been restored in various ways: a) skull, b) classic rendering of the head with nostrils on top, c) with speculative trunk, d) modern depiction with nostrils low on the snout and a possible resonating chamber

A diagnosis is a statement of the anatomical features of an organism (or group) that collectively distinguish it from all other organisms. Some, but not all, of the features in a diagnosis are also autapomorphies - distinctive anatomical features that are unique to a given organism or group.

The clade Diplodocidae is distinguished based on the following characteristics:[14]

  • nares: the external nares face dorsally; and the internarial bar is absent
  • jugal: the jugal forms a substantial part of the caudoventral margin of the antorbital fenestra
  • quadratojugal processes: the angle between the rostral quadratojugal process and the dorsal quadratojugal process is approximately 130°
  • paroccipital process: the distal end of the paroccipital process is rounded and tongue-like in shape
  • parasphenoid: the parasphenoid rostrum is a laterally compressed, thin spike and is lacking the longitudinal dorsal groove
  • pterygoid: the ectopterygoid process of the pterygoid is located below the antorbital fenestra, and is reduced, such that it is not visible below the ventral margin of the skull when examined in lateral view; also the breadth of the main body of the pterygoid at least 33% of the length of the pterygoid
  • teeth: at least 5-6 replacement teeth occur per alveolus (as observed in Nigersaurus)
  • dorsal vertebrae: no more than 10 dorsal vertebrae are present
  • caudal vertebrae: 70-80 caudal vertebrae are present
  • pedal phalanges: pedal phalanx I-1 has a proximoventral margin drawn out into a thin plate or heel that underlies the distal end of metatarsal I; also pedal phalanx II-2 is reduced in craniocaudal length and has an irregular shape

Skin

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Skin impression of a diplodocid, specimen CMC VP 10659

Few skin impressions of diplodocids have been found. However, at least one significant find was reported by Stephen Czerkas in 1992. Fossils from the Howe Quarry in Shell, Wyoming preserved portions of the skin from around the tip of the tail, or "whiplash".[15] Czerkas noted that the skin preserved a sequence of conical spines, and that other, larger spines were found scattered around larger tail vertebrae. The spines appeared to be oriented in a single row along the mid-line of the tail, and Czerkas speculated that this midline row may have continued over the animal's entire back and neck.[16]

Skin fossils have been discovered at the Mother's Day Quarry that have been assigned to Diplodocus sp. These skin fossils exhibit a vast amount of scale diversity, the scales of which vary in shape, size, orientation, and 3-dimensional relief depending on their location on the integument. Some of the scale orientations may indicate where the skin originated on the body. For instance, a scale orientation consisting of arching rows of square scales is noted to look similar to scale orientations seen around crocodilian limbs, so it is hypothesized that this area may have come from around a limb in life. Due to the high diversity of scales seen on a relatively small area of skin, the small size of the scales, and the presence of small and juvenile individuals at the Mother's Day Quarry, it is hypothesized that the skin originated from a small or juvenile individual.[17]

Paleobiology

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Diet and feeding

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Their teeth were only present in the front of the mouth, and looked like pencils or pegs. They probably used their teeth to crop off food, without chewing, and relied on gastroliths (gizzard stones) to break down tough plant fibers (similar to modern birds). Diplodocines have highly unusual teeth compared to other sauropods. The crowns are long and slender, and elliptical in cross-section, while the apex forms a blunt, triangular point.[18] The most prominent wear facet is on the apex, though unlike all other wear patterns observed within sauropods, diplodocine wear patterns are on the labial (cheek) side of both the upper and lower teeth.[18]

 
Seismosaurus (=Diplodocus)

This implies that the feeding mechanism of Diplodocus and other diplodocids was radically different from that of other sauropods. Unilateral branch stripping is the most likely feeding behavior of Diplodocus,[19][20][21] as it explains the unusual wear patterns of the teeth (coming from tooth–food contact). In unilateral branch stripping, one tooth row would have been used to strip foliage from the stem, while the other would act as a guide and stabilizer. With the elongated preorbital (in front of the eyes) region of the skull, longer portions of stems could be stripped in a single action.[18] Also, the palinal (backwards) motion of the lower jaws could have contributed two significant roles to feeding behaviour: 1) an increased gape, and 2) allowed fine adjustments of the relative positions of the tooth rows, creating a smooth stripping action.[18]

Young et al. (2012) used biomechanical modelling to examine the performance of the diplodocine skull. It was concluded that the proposal that its dentition was used for bark-stripping was not supported by the data, which showed that under that scenario, the skull and teeth would undergo extreme stresses. The hypotheses of branch-stripping and/or precision biting were both shown to be biomechanically plausible feeding behaviors.[22] Diplodocine teeth were also continually replaced throughout their lives, usually in less than 35 days, as was discovered by Michael D'Emic et al. Within each tooth socket, as many as five replacement teeth were developing to replace the next one. Studies of the teeth also reveal that it preferred different vegetation from the other sauropods of the Morrison, such as Camarasaurus. This may have better allowed the various species of sauropods to exist without competition.[23]

Growth

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Long-bone histology enables researchers to estimate the age that a specific individual reached. A study by Griebeler et al. (2013) examined long bone histological data and concluded that the diplodocid MfN.R.2625 weighed 4,753 kilograms (5.2 short tons), reached sexual maturity at 23 years and died at age 24. The same growth model indicated that the diplodocid MfN.R.NW4 weighed 18,463 kilograms (20.4 short tons), and died at age 23, before reaching sexual maturity.[24]

Paleopathology

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An unnamed diplodocid specimen from the Morrison Formation nicknamed "Dolly" shows evidence of a throat infection that created cauliflowered bone in the vertebral air sacs. The infection is theorized to have been similar to aspergillosis, though research is ongoing. Whether or not the infection contributed to the dinosaur's death remains unknown.[25][26]

Tail function

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Diplodocids also had long, whip-like tails, which were thick at the base and tapered off to be very thin at the end. Computer simulations have shown that the diplodocids could have easily snapped their tails, like a bullwhip. This could generate a sonic boom in excess of 200 decibels, and may have been used in mating displays, or to drive off predators. There is some circumstantial evidence supporting this as well: a number of diplodocids have been found with fused or damaged tail vertebrae, which may be a symptom of cracking their tails: these are particularly common between the 18th and the 25th caudal vertebra, a region the authors consider a transitional zone between the stiff muscular base and the flexible whiplike section.[27] However, Rega (2012) notes that Camarasaurus, while lacking a tailwhip, displays a similar level of caudal co-ossification, and that Mamenchisaurus, while having the same pattern of vertebral metrics, lacks a tailwhip and doesn't display fusion in any "transitional region". Also, the crush fractures which would be expected if the tail was used as a whip have never been found in diplodocids.[28] More recently, Baron (2020) considers the use of the tail as a bullwhip unlikely because of the potentially catastrophic muscle and skeletal damage such speeds could cause on the large and heavy tail. Instead, he proposes that the tails might have been used as a tactile organ to keep in touch with the individuals behind and on the sides in a group while migrating, which could have augmented cohesion and allowed communication among individuals while limiting more energetically demanding activities like stopping to search for dispersed individuals, turning to visually check on individuals behind, or communicating vocally.[29]

Classification

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Holotype specimens of Diplodocus carnegii and Apatosaurus louisae at Carnegie Museum of Natural History

Diplodocidae was the third name given to what is now recognized as the single family of long-necked, whip-tailed sauropods. Edward Drinker Cope named the family Amphicoeliidae in 1878 for his genus Amphicoelias, sometimes considered a diplodocid.[30] However, the name Amphicoeliidae did not come into wider use and was not used in the scientific literature after 1899, making it a nomen oblitum ("forgotten name") according to the ICZN, preventing it from displacing the name Diplodocidae as a senior synonym.[31] More recent studies have also shown that Amphicoelias itself does not belong to this family, but is instead a more primitive diplodocoid.[32] A similar situation occurred for the family name Atlantosauridae, named by Othniel Charles Marsh in 1877, and which Hay argued had priority over Amphicoelidae.[33] George Olshevsky declared Atlantosauridae a nomen oblitum in 1991, though scientists such as Steel and Nowinski had treated Atlantosauridae as a valid name as late as 1971, and the former even added a subfamily, Atlantosaurinae.[31][34]

Some dinosaurs have been considered diplodocids in the past but have not been found to be members of that group in later, larger analyses of the family's relationships. Australodocus, for example, was initially described as a diplodocid, but may actually have been a Macronarian.[32][35] Amphicoelias was traditionally considered a diplodocid due to its similar anatomy, but phylogenetic studies showed it to be a more basal member of the Diplodocoidea.[32]

The relationships of species within Diplodocidae has also been subject to frequent revision. A study by Lovelace, Hartman and Wahl in 2008 found that Suuwassea and Supersaurus were relatives of Apatosaurus, within the subfamily Apatosaurinae. However, a subsequent analysis by Whitlock in 2011 showed that Supersaurus is slightly closer to Diplodocus than to Apatosaurus, and that Suuwassea is actually a primitive dicraeosaurid.[32]

 
Cast skeleton of Brontosaurus parvus based on the University of Wyoming specimen produced by Triebold Paleontology Incorporated

The subfamily Diplodocinae, was erected to include Diplodocus and its closest relatives, including Barosaurus.[36][37] The Portuguese Dinheirosaurus and the African Tornieria have also been identified as close relatives of Diplodocus by some authors.[38][39]

Cladogram of the Diplodocidae after Tschopp, Mateus, and Benson (2015).[2]

Diplodocidae

Evolution and biogeography

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Diplodocids probably evolved in North America, where most diplodocid fossils are found.[40] However, diplodocids have been found on most continents, including South America, Europe, and Africa. Diplodocids and their close relatives, dicraeosaurids, must have diverged from each other by the time the earliest known dicraeosaurid, Lingwulong, appears in the fossil record.[41] Lingwulong was originally thought to be possibly as old as Early Jurassic, but is now considered to date to the late Middle Jurassic.[42]

Most diplodocids lived during the Jurassic period, but they survived into the Early Cretaceous, at least in Africa and South America. An unnamed diplodocid is known from the Kirkwood Formation of South Africa.[43] Leinkupal laticauda is from the Bajada Colorada Formation of Argentina,[44] and indeterminate diplodocid material is known from the nearby Mulichinco Formation of similar age.[45]

References

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  1. ^ Danison, Andrew; Wedel, Mathew; Barta, Daniel; Woodward, Holly; Flora, Holley; Lee, Andrew; Snively, Eric (2024-12-21). "Chimerism in specimens referred to Saurophaganax maximus reveals a new species of Allosaurus (Dinosauria, Theropoda)". Vertebrate Anatomy Morphology Palaeontology. 12. doi:10.18435/vamp29404. ISSN 2292-1389.
  2. ^ a b c Tschopp, E.; Mateus, O.; Benson, R. B. J. (2015). "A specimen-level phylogenetic analysis and taxonomic revision of Diplodocidae (Dinosauria, Sauropoda)". PeerJ. 3: e857. doi:10.7717/peerj.857. PMC 4393826. PMID 25870766.
  3. ^ a b c Lovelace, David M.; Hartman, Scott A.; Wahl, William R. (2007). "Morphology of a specimen of Supersaurus (Dinosauria, Sauropoda) from the Morrison Formation of Wyoming, and a re-evaluation of diplodocid phylogeny". Arquivos do Museu Nacional. 65 (4): 527–544.
  4. ^ Bates, Karl T.; Falkingham, Peter L.; Macaulay, Sophie; Brassey, Charlotte; Maidment, Susannah C. R. (2015). "Downsizing a giant: re-evaluating Dreadnoughtus body mass". Biology Letters. 11 (6): 20150215. doi:10.1098/rsbl.2015.0215. eISSN 1744-957X. ISSN 1744-9561. PMC 4528471. PMID 26063751.
  5. ^ Campione, Nicolás E. (2017). "Extrapolating body masses in large terrestrial vertebrates". Paleobiology. 43 (4): 693–699. doi:10.1017/pab.2017.9. eISSN 1938-5331. ISSN 0094-8373. S2CID 90635399.
  6. ^ Gallina, Pablo A.; Apesteguía, Sebastián; Carballido, José L.; Garderes, Juan P. (2022). "Southernmost spiny backs and whiplash tails: flagellicaudatans from South America". In Otero, Alejandro; Carballido, José L.; Pol, Diego (eds.). South American Sauropodomorph Dinosaurs. Cham: Springer International Publishing. pp. 209–236. ISBN 978-3-030-95958-6.
  7. ^ a b Witmer, L. M. (2001-08-03). "Nostril position in dinosaurs and other vertebrates and its significance for nasal function". Science. 293 (5531): 850–853. CiteSeerX 10.1.1.629.1744. doi:10.1126/science.1062681. PMID 11486085. S2CID 7328047.
  8. ^ Bakker, R. T. (1986). The Dinosaur Heresies: New Theories Unlocking the Mystery of the Dinosaurs and their Extinction. New York: Morrow.
  9. ^ Knoll, F.; Galton, P.M.; López-Antoñanzas, R. (2006). "Paleoneurological evidence against a proboscis in the sauropod dinosaur Diplodocus". Geobios. 39 (2): 215–221. doi:10.1016/j.geobios.2004.11.005.
  10. ^ Taylor, Michael P.; Wedel, Mathew J. (2013-02-12). "Why sauropods had long necks; and why giraffes have short necks". PeerJ. 1: e36. doi:10.7717/peerj.36. ISSN 2167-8359. PMC 3628838. PMID 23638372.
  11. ^ McIntosh, John S. (2005). "The genus Barosaurus Marsh (Sauropoda, Diplodocidae)". In Tidwell, Virginia; Carpenter, Kenneth (eds.). Thunder-lizards: the sauropodomorph dinosaurs. Life of the past. Bloomington: Indiana University Press. pp. 38–77. ISBN 0-253-34542-1.
  12. ^ Stevens, Kent A.; Parrish, J. Michael (1999-04-30). "Neck Posture and Feeding Habits of Two Jurassic Sauropod Dinosaurs". Science. 284 (5415): 798–800. doi:10.1126/science.284.5415.798. eISSN 1095-9203. ISSN 0036-8075. PMID 10221910.
  13. ^ Taylor, Michael P. (2014-12-23). "Quantifying the effect of intervertebral cartilage on neutral posture in the necks of sauropod dinosaurs". PeerJ. 2: e712. doi:10.7717/peerj.712. ISSN 2167-8359. PMC 4277489. PMID 25551027.
  14. ^ Upchurch, P.; Barrett, P. M.; Dodson, P. (2004). "Sauropoda". In Weishampel, D. B.; Dodson, P.; Osmólska, H. (eds.). The Dinosauria (2nd ed.). University of California Press.
  15. ^ Czerkas, S.A. (1993). "The new look of sauropods". Journal of Vertebrate Paleontology. 13: 26A. doi:10.1080/02724634.1993.10011533.
  16. ^ Czerkas, S.A. (1993). "Discovery of dermal spines reveals a new look for sauropod dinosaurs". Geology. 20 (12): 1068–1070. Bibcode:1992Geo....20.1068C. doi:10.1130/0091-7613(1992)020<1068:dodsra>2.3.co;2.
  17. ^ Gallagher, T; Poole, J; Schein, J (2021). "Evidence of integumentary scale diversity in the late Jurassic Sauropod Diplodocus sp. from the Mother's Day Quarry, Montana". PeerJ. 9: e11202. doi:10.7717/peerj.11202. PMC 8098675. PMID 33986987.
  18. ^ a b c d Upchurch, P.; Barrett, P.M. (2000). "The evolution of sauropod feeding mechanism". In Sues, Hans Dieter (ed.). Evolution of Herbivory in Terrestrial Vertebrates. Cambridge University Press. ISBN 978-0-521-86349-3.
  19. ^ Norman, D.B. (1985). The illustrated Encyclopedia of Dinosaurs. London: Salamander Books.
  20. ^ Dodson, P. (1990). "Sauropod paleoecology". In Weishampel, D.B.; Dodson, P.; Osmólska, H. (eds.). The Dinosauria" 1st Edition. University of California Press. ASIN B008UBRHZM.
  21. ^ Barrett, P.M.; Upchurch, P. (1994). "Feeding mechanisms of Diplodocus". Gaia. 10: 195–204.
  22. ^ Young, Mark T.; Rayfield, Emily J.; Holliday, Casey M.; Witmer, Lawrence M.; Button, David J.; Upchurch, Paul; Barrett, Paul M. (August 2012). "Cranial biomechanics of Diplodocus (Dinosauria, Sauropoda): testing hypotheses of feeding behaviour in an extinct megaherbivore". Naturwissenschaften. 99 (8): 637–643. Bibcode:2012NW.....99..637Y. doi:10.1007/s00114-012-0944-y. ISSN 1432-1904. PMID 22790834. S2CID 15109500.
  23. ^ D’Emic, M. D.; Whitlock, J. A.; Smith, K. M.; Fisher, D. C.; Wilson, J. A. (2013). Evans, A. R. (ed.). "Evolution of high tooth replacement rates in sauropod dinosaurs". PLOS ONE. 8 (7): e69235. Bibcode:2013PLoSO...869235D. doi:10.1371/journal.pone.0069235. PMC 3714237. PMID 23874921.
  24. ^ Griebeler, EM; Klein, N; Sander, PM (2013). "Aging, Maturation and Growth of Sauropodomorph Dinosaurs as Deduced from Growth Curves Using Long Bone Histological Data: An Assessment of Methodological Constraints and Solutions". PLOS ONE. 8 (6): e67012. Bibcode:2013PLoSO...867012G. doi:10.1371/journal.pone.0067012. PMC 3686781. PMID 23840575.
  25. ^ "Achoo! Respiratory illness gave young 'Dolly' the dinosaur flu-like symptoms". Live Science. 10 February 2022.
  26. ^ "Discovery of what ailed Dolly the dinosaur is a first, researchers say". CNN. 10 February 2022.
  27. ^ Myhrvold, N. P.; Currie, P. J. (1997). "Supersonic sauropods? Tail dynamics in the diplodocids" (PDF). Paleobiology. 23 (4): 393–409. doi:10.1017/S0094837300019801. S2CID 83696153.
  28. ^ Rega, E. (2012). "Disease in dinosaurs". In Brett-Surman, M.; Holtz, T.; Farlow, J. (eds.). The Complete Dinosaur (2 ed.). Bloomington and Indianapolis: Indiana University Press.
  29. ^ Baron, Matthew G. (2021-10-03). "Tactile tails: a new hypothesis for the function of the elongate tails of diplodocid sauropods". Historical Biology. 33 (10): 2057–2066. doi:10.1080/08912963.2020.1769092. ISSN 0891-2963. S2CID 219762797.
  30. ^ Carpenter, K., K. (2006). "Biggest of the big: a critical re-evaluation of the mega-sauropod Amphicoelias fragillimus". New Mexico Museum of Natural History and Science Bulletin. 36: 131–138.
  31. ^ a b Olshevsky, G. (1991). "A revision of the Parainfraclass Archosauria Cope, 1869, excluding the advanced Crocodylia". Mesozoic Meanderings. 2.
  32. ^ a b c d Whitlock, J.A. (2011). "A phylogenetic analysis of Diplodocoidea (Saurischia: Sauropoda)". Zoological Journal of the Linnean Society. 161 (4): 872–915. doi:10.1111/j.1096-3642.2010.00665.x.
  33. ^ Hay, O.P. (1902). "Bibliography and Catalogue of the Fossil Vertebrata of North America". Bulletin of the United States Geological Survey. 179: 1–868.
  34. ^ Nowinski, A (1971). "Nemegtosaurus mongoliensis n. gen., n. sp. (Sauropoda) from the uppermost Cretaceous of Mongolia". Palaeontologia Polonica. 25: 57–81.
  35. ^ Remes, Kristian (2007). "A second Gondwanan diplodocid dinosaur from the Upper Jurassic Tendaguru Beds of Tanzania, East Africa" (PDF). Palaeontology. 50 (3): 653–667. doi:10.1111/j.1475-4983.2007.00652.x. S2CID 129739733.
  36. ^ Taylor, M.P.; Naish, D. (2005). "The phylogenetic taxonomy of Diplodocoidea (Dinosauria: Sauropoda)". PaleoBios. 25 (2): 1–7. ISSN 0031-0298.
  37. ^ Harris, J.D. (2006). "The significance of Suuwassea emiliae (Dinosauria: Sauropoda) for flagellicaudatan intrarelationships and evolution" (PDF). Journal of Systematic Palaeontology. 4 (2): 185–198. doi:10.1017/S1477201906001805. S2CID 9646734. Archived from the original (PDF) on 2019-12-29.
  38. ^ Bonaparte, J.F.; Mateus, O. (1999). "A new diplodocid, Dinheirosaurus lourinhanensis gen. et sp. nov., from the Late Jurassic beds of Portugal". Revista del Museo Argentino de Ciencias Naturales. 5 (2): 13–29. Archived from the original on 2012-02-19. Retrieved 2013-06-13.
  39. ^ Rauhut, O.W.M.; Remes, K.; Fechner, R.; Cladera, G. & Puerta, P. (2005). "Discovery of a short-necked sauropod dinosaur from the Late Jurassic period of Patagonia". Nature. 435 (7042): 670–672. Bibcode:2005Natur.435..670R. doi:10.1038/nature03623. PMID 15931221. S2CID 4385136.
  40. ^ Whitlock, John A.; Wilson Mantilla, Jeffrey A. (2020-12-23). "The Late Jurassic sauropod dinosaur 'Morosaurus' agilis Marsh, 1889 reexamined and reinterpreted as a dicraeosaurid". Journal of Vertebrate Paleontology. 40 (6): –1780600. doi:10.1080/02724634.2020.1780600. ISSN 0272-4634. S2CID 234424022.
  41. ^ Xu, Xing; Upchurch, Paul; Mannion, Philip D.; Barrett, Paul M.; Regalado-Fernandez, Omar R.; Mo, Jinyou; Ma, Jinfu; Liu, Hongan (2018). "A new Middle Jurassic diplodocoid suggests an earlier dispersal and diversification of sauropod dinosaurs". Nature Communications. 9 (1): 2700. doi:10.1038/s41467-018-05128-1. ISSN 2041-1723. PMC 6057878. PMID 30042444.
  42. ^ Dai, Hui; Tan, Chao; Xiong, Can; Ma, Qingyu; Li, Ning; Yu, Haidong; Wei, Zhaoying; Wang, Ping; Yi, Jian; Wei, Guangbiao; You, Hailu; Ren, Xinxin (2022-11-02). "New macronarian from the Middle Jurassic of Chongqing, China: phylogenetic and biogeographic implications for neosauropod dinosaur evolution". Royal Society Open Science. 9 (11): 220794. doi:10.1098/rsos.220794. ISSN 2054-5703. PMC 9627447. PMID 36340515.
  43. ^ McPhee, Blair W.; Mannion, Philip D.; de Klerk, William J.; Choiniere, Jonah N. (2016). "High diversity in the sauropod dinosaur fauna of the Lower Cretaceous Kirkwood Formation of South Africa: Implications for the Jurassic–Cretaceous transition". Cretaceous Research. 59: 228–248. doi:10.1016/j.cretres.2015.11.006. hdl:10044/1/27470. ISSN 0195-6671.
  44. ^ Gallina, Pablo A.; Apesteguía, Sebastián; Haluza, Alejandro; Canale, Juan I. (2014-05-14). "A diplodocid sauropod survivor from the Early Cretaceous of South America". PLOS ONE. 9 (5): –97128. doi:10.1371/journal.pone.0097128. ISSN 1932-6203. PMC 4020797. PMID 24828328.
  45. ^ Gnaedinger, Silvia; Coria, Rodolfo A.; Koppelhus, Eva; Casadío, Silvio; Tunik, Maisa; Currie, Philip (2017). "First Lower Cretaceous record of Podocarpaceae wood associated with dinosaur remains from Patagonia, Neuquén Province, Argentina". Cretaceous Research. 78: 228–239. doi:10.1016/j.cretres.2017.06.014. hdl:11336/30408. ISSN 0195-6671. S2CID 134854078.
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