Genus

Valid Extinct

Haplocanthosaurus

Hatcher 1903

Etymology Reptile à colonne

Haplocanthosaurus is a genus of diplodocoid sauropod dinosaur. Two species, H. delfsi and H. priscus, are known from incomplete fossil skeletons. They lived during the Late Jurassic, 155 to 152 million years ago in North America. The type species is H. priscus, named in 1903 John Bell Hatcher , and the referred species H. delfsi was discovered by a young college student named Edwin Delfs in Colorado, United States and described by Jack McIntosh and Michael Williams in 1988. Haplocanthosaurus specimens have been found in the lowermost layer of the Morrison Formation, along with Hesperosaurus mjosi, Brontosaurus yahnahpin, and Allosaurus jimmadseni.

Temporal range

Triassic

Jurassic

Cretaceous

Paleogene

Neogene

252 201 145 66 0 Ma

PBDB occurrences

Group

Dinosaures

Herbivore Ground dwelling, gregarious Terrestrial

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Wikimedia

PBDB ↗ Wikipedia ↗

Classification

Dinosauria Unranked clade

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Saurischia Unranked clade

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Sauropodomorpha Unranked clade

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Massopoda Unranked clade

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Sauropodiformes Unranked clade

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Sauropoda Unranked clade

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Gravisauria Unranked clade

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Eusauropoda Unranked clade

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Neosauropoda Unranked clade

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Diplodocoidea Unranked clade

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Haplocanthosaurus Genus

Measurements

Length

10,5 m ⓘ

Haplocanthosaurus priscus — min connu

14,5 m ⓘ

Haplocanthosaurus delfsi — max connu

21,5 m ⓘ

Mass

5 000 kg ⓘ

Haplocanthosaurus priscus — min connu

13 000 kg ⓘ

Haplocanthosaurus delfsi — max connu

Fossil sites 11 geolocated sites

Distribution

Top countries

🇺🇸 United States

Geological formations

Morrison

Temporal distribution

Tithonian (149.2–143.1 Ma)

Kimmeridgian (154.8–149.2 Ma)

Species (3)

Haplocanthosaurus delfsi 152 Ma

Haplocanthosaurus priscus 152 Ma

Haplocanthosaurus utterbacki subjective synonym of Haplocanthosaurus priscus 152 Ma

Synonyms (1)

Haplocanthus subjective synonym of Haplocanthosaurus

Images 4

Bibliography

Original description

J. B. Hatcher. 1903. A new name for the dinosaur Haplocanthus Hatcher. Proceedings of the Biological Society of Washington 16:100

Bibliography (8)

C. D. Boisvert, B. Curtice, and D. R. Wilhite, M. Wedel. 2024. Eleven specimens from ten locales in eight collections across three states, the diversity of known Haplocanthosaurus specimens in the Morrison Formation. 12th North American Paleontological Convention, Program with Abstracts, edited by J. A. Mantilla Wilson & M. Friedman. University of Michigan Papers on Paleontology 39:126

B. Curtice, M. Wedel, and D. R. Wilhite, C. Boisvert. 2023. New material of Haplocanthosaurus (Hatcher 1903) from the Dry Mesa Dinosaur Quarry and a comment on sauropod diversity. 14th Symposium on Mesozoic Terrestrial Ecosystems and Biota. The Anatomical Record 306 (S1)

D. Richmond. 2023. Stratigraphy, sedimentology, and paleoclimatic proxies of the Upper Jurassic Morrison Formation of central Montana. Geology of the Intermountain West 10(16867):223–276 DOI ↗

J. R. Foster. 2003. Paleoecological analysis of the vertebrate fauna of the Morrison Formation (Upper Jurassic), Rocky Mountain region, U.S.A. New Mexico Museum of Natural History and Science Bulletin 23:1-95

J. S. McIntosh and M. E. Williams. 1988. A new species of sauropod dinosaur, Haplocanthosaurus delfsi sp. nov., from the Upper Jurassic Morrison Fm. of Colorado. Kirtlandia 43:3-26

J. S. McIntosh. 1981. Annotated catalogue of the dinosaurs (Reptilia, Archosauria) in the collections of the Carnegie Museum of Natural History. Bulletin of Carnegie Museum of Natural History 18:1-67 DOI ↗

J. B. Hatcher. 1903. A new sauropod dinosaur from the Jurassic of Colorado. Proceedings of the Biological Society of Washington 16:1-2

J. B. Hatcher. 1903. Osteology of Haplocanthosaurus, with description of a new species, and remarks on the probable habits of the Sauropoda and the age and origin of the Atlantosaurus Beds. Memoirs of the Carnegie Museum 2(1):1-72 DOI ↗

Haplocanthosaurus

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