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Lower limits of ornithischian dinosaur body size inferred from a new Upper Jurassic heterodontosaurid from North America.
Proc Biol Sci. 2010 Feb 07; 277(1680):375-81.PB

Abstract

The extremes of dinosaur body size have long fascinated scientists. The smallest (<1 m length) known dinosaurs are carnivorous saurischian theropods, and similarly diminutive herbivorous or omnivorous ornithischians (the other major group of dinosaurs) are unknown. We report a new ornithischian dinosaur, Fruitadens haagarorum, from the Late Jurassic of western North America that rivals the smallest theropods in size. The largest specimens of Fruitadens represent young adults in their fifth year of development and are estimated at just 65-75 cm in total body length and 0.5-0.75 kg body mass. They are thus the smallest known ornithischians. Fruitadens is a late-surviving member of the basal dinosaur clade Heterodontosauridae, and is the first member of this clade to be described from North America. The craniodental anatomy and diminutive body size of Fruitadens suggest that this taxon was an ecological generalist with an omnivorous diet, thus providing new insights into morphological and palaeoecological diversity within Dinosauria. Late-surviving (Late Jurassic and Early Cretaceous) heterodontosaurids are smaller and less ecologically specialized than Early (Late Triassic and Early Jurassic) heterodontosaurids, and this ecological generalization may account in part for the remarkable 100-million-year-long longevity of the clade.

Authors+Show Affiliations

Bayerische Staatssammlung für Paläontologie und Geologie, Richard-Wagner-Strasse 10, 80333 Munich, Germany. butler.richard.j@gmail.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Historical Article
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

19846460

Citation

Butler, Richard J., et al. "Lower Limits of Ornithischian Dinosaur Body Size Inferred From a New Upper Jurassic Heterodontosaurid From North America." Proceedings. Biological Sciences, vol. 277, no. 1680, 2010, pp. 375-81.
Butler RJ, Galton PM, Porro LB, et al. Lower limits of ornithischian dinosaur body size inferred from a new Upper Jurassic heterodontosaurid from North America. Proc Biol Sci. 2010;277(1680):375-81.
Butler, R. J., Galton, P. M., Porro, L. B., Chiappe, L. M., Henderson, D. M., & Erickson, G. M. (2010). Lower limits of ornithischian dinosaur body size inferred from a new Upper Jurassic heterodontosaurid from North America. Proceedings. Biological Sciences, 277(1680), 375-81. https://doi.org/10.1098/rspb.2009.1494
Butler RJ, et al. Lower Limits of Ornithischian Dinosaur Body Size Inferred From a New Upper Jurassic Heterodontosaurid From North America. Proc Biol Sci. 2010 Feb 7;277(1680):375-81. PubMed PMID: 19846460.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Lower limits of ornithischian dinosaur body size inferred from a new Upper Jurassic heterodontosaurid from North America. AU - Butler,Richard J, AU - Galton,Peter M, AU - Porro,Laura B, AU - Chiappe,Luis M, AU - Henderson,Donald M, AU - Erickson,Gregory M, Y1 - 2009/10/21/ PY - 2009/10/23/entrez PY - 2009/10/23/pubmed PY - 2010/3/13/medline SP - 375 EP - 81 JF - Proceedings. Biological sciences JO - Proc Biol Sci VL - 277 IS - 1680 N2 - The extremes of dinosaur body size have long fascinated scientists. The smallest (<1 m length) known dinosaurs are carnivorous saurischian theropods, and similarly diminutive herbivorous or omnivorous ornithischians (the other major group of dinosaurs) are unknown. We report a new ornithischian dinosaur, Fruitadens haagarorum, from the Late Jurassic of western North America that rivals the smallest theropods in size. The largest specimens of Fruitadens represent young adults in their fifth year of development and are estimated at just 65-75 cm in total body length and 0.5-0.75 kg body mass. They are thus the smallest known ornithischians. Fruitadens is a late-surviving member of the basal dinosaur clade Heterodontosauridae, and is the first member of this clade to be described from North America. The craniodental anatomy and diminutive body size of Fruitadens suggest that this taxon was an ecological generalist with an omnivorous diet, thus providing new insights into morphological and palaeoecological diversity within Dinosauria. Late-surviving (Late Jurassic and Early Cretaceous) heterodontosaurids are smaller and less ecologically specialized than Early (Late Triassic and Early Jurassic) heterodontosaurids, and this ecological generalization may account in part for the remarkable 100-million-year-long longevity of the clade. SN - 1471-2954 UR - https://www.unboundmedicine.com/medline/citation/19846460/Lower_limits_of_ornithischian_dinosaur_body_size_inferred_from_a_new_Upper_Jurassic_heterodontosaurid_from_North_America_ L2 - https://royalsocietypublishing.org/doi/10.1098/rspb.2009.1494?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -