Alamosaurus

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Alamosaurus
Temporal range: Late Cretaceous, 70–66 Ma
↓
Perot Museum Alamosaurus and Tyrannosaurus.jpg
Restored skeletons of Alamosaurus and Tyrannosaurus at Perot Museum
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: †Sauropodomorpha
Clade: †Neosauropoda
Clade: †Titanosauria
Clade: †Lithostrotia
Family: †Saltasauridae
Subfamily: †Opisthocoelicaudiinae
Genus: †Alamosaurus
Gilmore, 1922
Type species
<templatestyles src="Noitalic/styles.css"/>†Alamosaurus sanjuanensis
Gilmore, 1922

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Alamosaurus (/ˌæləmoʊˈsɔːrəs/; meaning "Ojo Alamo lizard") is a genus of titanosaurian sauropod dinosaurs, containing a single known species, Alamosaurus sanjuanensis, from the late Cretaceous Period of what is now southern North America. Isolated vertebrae and limb bones indicate that it reached sizes comparable to Argentinosaurus and Puertasaurus, which would make it the largest dinosaur known from North America.[1] Its fossils have been recovered from a variety of rock formations spanning the Maastrichtian age of the late Cretaceous period. Specimens of a juvenile Alamosaurus sanjuanensis have been recovered from only a few meters below the Cretaceous-Paleogene boundary in Texas, making it among the last surviving non-avian dinosaur species.[2]

Description

Size comparison, showing the scale of one of the more complete Alamosaurus specimens. Fragmentary remains suggest it could grow much larger.

Alamosaurus was a gigantic quadrupedal herbivore with a long neck and tail and relatively long limbs.[2] Its body was at least partly covered in bony armor.[3] Though most of the complete remains come from juvenile or small adult specimens, three fragmentary specimens, SMP VP−1625, SMP VP−1850 and SMP VP−2104, suggest that adult Alamosaurus could have grown to enormous sizes comparable to the largest known dinosaurs like Argentinosaurs, which has been estimated to weigh 73 tonnes (72 long tons; 80 short tons).[1] The total estimate length of Alamosaurus ranges between 79 to 100 feet (24 to 30 meters) long;[4] the shoulder height is estimated between 19.5 to 24.7 feet (5.9 to 7.5 meters) tall.[5]

Though no skull has ever been found, rod-shaped teeth have been found with Alamosaurus skeletons and probably belonged to this dinosaur.[2] The vertebrae from the middle part of its tail had elongated centra.[6] Alamosaurus had vertebral lateral fossae that resembled shallow depressions.[6] Fossae that similarly resemble shallow depressions are known from Saltasaurus, Malawisaurus, Aeolosaurus, and Gondwanatitan.[6] Venenosaurus also had depression-like fossae, but its "depressions" penetrated deeper into the vertebrae, were divided into two chambers, and extend farther into the vertebral columns.[6] Alamosaurus had more robust radii than Venenosaurus.[6]

History

Holotype scapula and paratype ischium

Alamosaurus remains have been discovered throughout the southwestern United States. The holotype was discovered in June 1921 by Charles Whitney Gilmore, John Bernard Reeside and Charles Hazelius Sternberg at the Barrel Springs Arroyo in the Naashoibito Member of the Ojo Alamo Formation (or Kirtland Formation under a different definition) of New Mexico which was deposited during the Maastrichtian stage of the Late Cretaceous Period.[7] Bones have also been recovered from other Maastrichtian formations, like the North Horn Formation of Utah and the Black Peaks, El Picacho and Javelina Formations of Texas.[8]

Smithsonian paleontologist Gilmore originally described the holotype, USNM 10486, a left scapula (shoulder bone), and the paratype USNM 10487, a right ischium (pelvic bone) in 1922, naming the type species Alamosaurus sunjuanensis. Contrary to popular assertions, the dinosaur is not named after the Alamo in San Antonio, Texas, or the battle that was fought there.[9] The holotype, the specimen the name was based on, was discovered in New Mexico and, at the time of its naming, Alamosaurus had not yet been found in Texas. Instead, the name Alamosaurus comes from Ojo Alamo, the geologic formation in which it was found and which was, in turn, named after the nearby Ojo Alamo trading post (since this time there has been some debate as to whether to reclassify the Alamosaurus-bearing rocks as belonging to the Kirtland Formation or whether they should remain in the Ojo Alamo Formation). The term alamo itself is a Spanish word meaning "poplar" and is used for the local subspecies of cottonwood tree. The term saurus is derived from saura (σαυρα), Greek for "lizard" and is the most common suffix used in dinosaur names. There is only one species in the genus, Alamosaurus sanjuanensis, which is named after San Juan County, New Mexico, where the first remains were found.[7]

In 1946, Gilmore posthumously described a more complete specimen, USNM 15660 found on 15 June 1937 on the North Horn Mountain of Utah by George B. Pearce. It consists of a complete tail, a right forelimb complete except for the fingers — which later research showed do not ossify with the Titanosauridae — and both ischia.[10] Since then, hundreds of other bits and pieces from Texas, New Mexico, and Utah have been referred to Alamosaurus, often without much description. Despite being fragmentary, until the second half of the twentieth century they represented much of the globally known titanosaurid material. The most completely known specimen, TMM 43621-1, is a recently discovered juvenile skeleton from Texas, which allowed educated estimates of length and mass.[2]

Some blocks catalogued under the same accession number as the relatively complete and well-known Alamosaurus specimen USNM 15660, and found in very close proximity to it based on bone impressions, were first investigated by Michael Brett-Surman in 2009. In 2015, he reported that the blocks contained osteoderms, the first confirmation of their existence on Alamosaurus.[11]

Reconstructed skeleton

No skull material is known, except for a few slender teeth.[8]

Classification

Gilmore in 1922 was uncertain about the precise affinities of Alamosaurus and did not determine it any further than a general Sauropoda.[7] In 1927 Friedrich von Huene placed it in the Titanosauridae.[12]

Alamosaurus was in any case an advanced, or derived, member of the group Titanosauria, but its relationships within that group are far from certain. The issue is further complicated by some researchers rejecting the name Titanosauridae and replacing it with Saltasauridae. One major analysis unites Alamosaurus with Opisthocoelicaudia in a subgroup Opisthocoelicaudinae of the Saltasauridae.[13] A major competing analysis finds Alamosaurus as a sister taxon to Pellegrinisaurus, with both genera located just outside Saltasauridae.[14] Other scientists have also noted particular similarities with the saltasaurid Neuquensaurus and the Brazilian Trigonosaurus (the "Peiropolis titanosaur") which is used in many cladistic and morphologic analyses of titanosaurians.[2]

Age

Alamosaurus fossils are most notably found in the Naashoibito member of the Ojo Alamo Formation (dated to between about 69-68 million years old) and in the Javelina Formation, though the exact age range of the later has been difficult to determine.[15] A juvenile specimen of Alamosaurus has been reported to come from the Black Peaks Formation, which overlies the Javelina in Big Bend, Texas, and which straddles the Cretaceous-Paleogene boundary. The Alamosaurus specimen was reported to come from a few meters below the boundary, dated to 66 Ma ago, though the position of the boundary in this region is uncertain.[2] Only one geological site in the Javelina Formation has thus far yielded the correct rock types for radiometric dating. The outcrop, situated in the middle strata of the formation about 90 meters below the K-Pg boundary and within the local range of Alamosaurus fossils, was dated to 69.0 plus or minus 0.9 million years old in 2010.[16] Using this date, in correlation with a measured age from the underlying Aguja Formation and the likely location of the K-Pg boundary in the overlying Black Peaks Formation, the Alamosaurus fauna seems to have lasted from about 70-66 million years ago, with the earliest records of Alamosaurus near the base of the Javelina formation, and the latest just below the K-Pg boundary in the Black Peaks Formation.[16]

Habitat and geographic origin

Reconstruction

Skeletal elements of Alamosaurus are among the most common Late Cretaceous dinosaur fossils found in the United States Southwest and are now used to define the fauna of that time and place, known as the "Alamosaurus fauna". In the south of Late Cretaceous North America, the transition from the Edmontonian to the Lancian faunal stages is even more dramatic than it was in the north. Thomas M. Lehman describes it as "the abrupt reemergence of a fauna with a superficially 'Jurassic' aspect."[17] These faunas are dominated by Alamosaurus and feature abundant Quetzalcoatlus in Texas.[17] The Alamosaurus-Quetzalcoatlus association probably represent semi-arid inland plains.[17]

The appearance of Alamosaurus may have represented an immigration event from South America.[17] Some taxa may have co-occurred on both continents, including Kritosaurus and Avisaurus.[17] Alamosaurus appears and achieves dominance in its environment very abruptly, which might support the idea that it originated following an immigration event.[17] Other scientists speculated that Alamosaurus was an immigrant from Asia.[17] However, critics of the immigration hypothesis note that inhabitants of an upland environment like Alamosaurus are more likely to be endemic than coastal species, and tend to have less of an ability to cross bodies of water.[17] Further, Early Cretaceous titanosaurs are already known, so North American potential ancestors for Alamosaurus already existed.[17]

Other contemporary dinosaurs from that part of the world include tyrannosaurs, smaller theropods, the hadrosaurs Edmontosaurus sp. and Kritosaurus sp., the ankylosaur Glyptodontopelta mimus, and the ceratopsids Torosaurus utahensis, Bravoceratops polyphemus, and Ojoceratops fowleri.[8]

Titanosaur fossils associated with Alamosaurus have been found in the Evanston Formation in Wyoming. Three articulated caudal vertebrae were collected above Hams Fork, and are housed at the Museum of Paleontology, University of California, Berkeley. These specimens have not been described[18]

References

  1. ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Lehman, T.M. & Coulson, A.B. 2002. A juvenile specimen of the sauropod Alamosaurus sanjuanensis from the Upper Cretaceous of Big Bend National Park, Texas. Journal of Palaeontology. 76(1): 156-172.
  3. ↑ Carrano, M.T. and D’Emic, M.D. in review. Osteoderms of the titanosaur sauropod dinosaur Alamosaurus sanjuanensis Gilmore, 1922. Journal of Vertebrate Paleontology.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Tidwell, V., Carpenter, K. & Meyer, S. 2001. New Titanosauriform (Sauropoda) from the Poison Strip Member of the Cedar Mountain Formation (Lower Cretaceous), Utah. In: Mesozoic Vertebrate Life. D. H. Tanke & K. Carpenter (eds.). Indiana University Press, Eds. D.H. Tanke & K. Carpenter. Indiana University Press. 139-165.
  7. ↑ 7.0 7.1 7.2 Gilmore, C.W. 1922. A new sauropod dinosaur from the Ojo Alamo Formation of New Mexico. Smithsonian Miscellaneous Collections. 72(14): 1-9.
  8. ↑ 8.0 8.1 8.2 Weishampel, D.B. et al.. (2004). "Dinosaur Distribution (Late Cretaceous, North America)". In Weishampel, D.B., Dodson, P., Oslmolska, H. (eds.). "The Dinosauria (Second ed.)". University of California Press.
  9. ↑ Anthony D. Fredericks, 2012, Desert Dinosaurs: Discovering Prehistoric Sites in the American Southwest, The Countryman Press, p. 102-103
  10. ↑ Gilmore, C.W. 1946. Reptilian fauna of the North Horn Formation of central Utah. U.S. Geological Survey Professional Paper. 210-C:29-51.
  11. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  12. ↑ F. v. Huene, 1927, "Sichtung der Grundlagen der jetzigen Kenntnis der Sauropoden", Eclogae Geologicae Helveticae 20: 444-470
  13. ↑ Wilson, J.A. 2002. Sauropod dinosaur phylogeny: critique and cladistic analysis. Zoological Journal of the Linnean Society. 136: 217-276.
  14. ↑ Upchurch, P., Barrett, P.M. & Dodson, P. 2004. Sauropoda. In: Weishampel, D.B., Dodson, P., & Osmolska, H. (Eds.) The Dinosauria (2nd Edition). Berkeley: University of California Press. Pp. 259–322.
  15. ↑ Sullivan, R.M., and Lucas, S.G. 2006. "The Kirtlandian land-vertebrate "age" – faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America." New Mexico Museum of Natural History and Science, Bulletin 35:7-29.
  16. ↑ 16.0 16.1 Lehman, T. M., Mcdowell, F. W., & Connelly, J. N. (2006). First isotopic (U-Pb) age for the Late Cretaceous Alamosaurus vertebrate fauna of West Texas, and its significance as a link between two faunal provinces. Journal of Vertebrate Paleontology, 26(4), 922-928.
  17. ↑ 17.0 17.1 17.2 17.3 17.4 17.5 17.6 17.7 17.8 Lehman, T. M., 2001, Late Cretaceous dinosaur provinciality: In: Mesozoic Vertebrate Life, edited by Tanke, D. H., and Carpenter, K., Indiana University Press, pp. 310–328.
  18. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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