Nanosaurus: Difference between revisions

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Marsh named three species of his new [[genus]] in 1877, two of which are today known to be dinosaurian:
Marsh named three species of his new [[genus]] in 1877, two of which are today known to be dinosaurian:
*''N. agilis'', based on [[Peabody Museum of Natural History|YPM 1913]], with remains including impressions of a [[dentary]], and [[postcrania]]l bits including an [[ilium (bone)|ilium]], [[femur|thigh bones]], [[tibia|shin bones]], and a [[fibula]];<ref name=OCM77a>Marsh, O.C. (1877a). Notice of some new vertebrate fossils. ''American Journal of Science'' (Series 3) 14:249-256.</ref>
*''N. agilis'', based on [[Peabody Museum of Natural History|YPM 1913]], with remains including impressions of a [[dentary]], and [[postcrania]]l bits including an [[ilium (bone)|ilium]], [[femur|thigh bones]], [[tibia|shin bones]], and a [[fibula]];<ref name=OCM77a>Marsh, O.C. (1877a). Notice of some new vertebrate fossils. ''American Journal of Science'' (Series 3) 14:249-256.</ref>
*''[[Othnielia|N. rex]]'', based on YPM 1915 (also called 1925 in Galton, 2006), a complete thigh bone;<ref name=OCM77b>Marsh, O.C. (1877b). Notice of new dinosaurian reptiles from the Jurassic formations. ''American Journal of Science'' (Series 3) 14:514-516.</ref>
*''[[Othnielia|N. rex]]'', based on YPM 1915 (also called 1925 in Galton, 2007), a complete thigh bone;<ref name=OCM77b>Marsh, O.C. (1877b). Notice of new dinosaurian reptiles from the Jurassic formations. ''American Journal of Science'' (Series 3) 14:514-516.</ref>
*and ''[[Hallopus|N. victor]]'',<ref name=OCM77a/> which he soon recognized to be something completely different, and is now known as the small, bipedal [[crocodylian]] relative ''[[Hallopus]]''.<ref name=OCM81>Marsh, O.C. (1881). Principle characters of American Jurassic dinosaurs. Part V. ''American Journal of Science'' 21:418-423.</ref>
*and ''[[Hallopus|N. victor]]'',<ref name=OCM77a/> which he soon recognized to be something completely different, and is now known as the small, bipedal [[crocodylian]] relative ''[[Hallopus]]''.<ref name=OCM81>Marsh, O.C. (1881). Principle characters of American Jurassic dinosaurs. Part V. ''American Journal of Science'' 21:418-423.</ref>
He regarded both dinosaur species as small ("cat sized"<ref name=OCM77a/> or "fox-sized"<ref name=OCM77b/>) animals.<ref name=GODML>{{cite web | author = [[George Olshevsky]] | title = Re: Nanosaurus rex | url= http://dml.cmnh.org/1995Aug/msg00194.html | accessdate = 2007-01-25 }}</ref>
He regarded both dinosaur species as small ("cat sized"<ref name=OCM77a/> or "fox-sized"<ref name=OCM77b/>) animals.<ref name=GODML>{{cite web | author = [[George Olshevsky]] | title = Re: Nanosaurus rex | url= http://dml.cmnh.org/1995Aug/msg00194.html | accessdate = 2007-01-25 }}</ref>
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With the 1881 reassignment of ''N. victor'', matters stood static for most of the next century. Marsh had originally set up Nanosauridae for this genus, but it generally was included in [[Hypsilophodontidae]] after his death.
With the 1881 reassignment of ''N. victor'', matters stood static for most of the next century. Marsh had originally set up Nanosauridae for this genus, but it generally was included in [[Hypsilophodontidae]] after his death.


In 1973, [[Peter Galton]] and [[James A. Jensen|Jim Jenson]] described a partial skeleton ([[Brigham Young University|BYU ESM 163]] as of Galton, 2006<ref name=PMG06>Galton, P.M. (2006). Teeth of ornithischian dinosaurs (mostly Ornithopoda) from the Morrison Formation (Upper Jurassic) of the western United States. In: K. Carpenter (ed.). ''Horns and Beaks: Ceratopsian and Ornithopod Dinosaurs''. Indiana University Press:Bloomington and Indianapolis, 17-47. ISBN 0-253-34817-X</ref>) missing the head, hands, and tail as ''Nanosaurus (?) rex''.<ref name=GJ73>Galton, P.M., and Jensen, J.A. (1973). Skeleton of a hypsilophodontid dinosaur (''Nanosaurus (?) rex'') from the Upper Jurassic of Utah. ''Brigham Young University Geology Series'' 20:137-157.</ref> By 1977, he had determined that ''Nanosaurus agilis'' was quite different from ''N. rex'' and the new skeleton, and coined ''[[Othnielia]]'' for ''N. rex''.<ref name=PMG77>Galton, P.M. (1977). The ornithopod dinosaur ''Dryosaurus'' and a [[Laurasia]]-[[Gondwanaland]] connection in the Upper Jurassic. ''Nature'' 268:230-232.</ref> He referred ''Nanosaurus'' proper to the nebulous [[Fabrosauridae|"Fabrosauridae"]],<ref name=PMG78>Galton, P.M. (1978). Fabrosauridae, the basal family of ornithischian dinosaurs (Reptilia: Ornithischia). ''Palaeontologische Zeitschrift'' 52(1/2):138-159.</ref> but other authors, including [[Paul Sereno]], regarded it as a [[nomen dubium|dubious]] basal ornithischian of unknown affinities,<ref name=PCS91>Sereno, P.C. (1991). ''Lesothosaurus'', "fabrosaurids," and the early evolution of Ornithischia. ''Journal of Vertebrate Paleontology'' 11(2):168-197.</ref> or as a dubious hypsilophodontid.<ref name=NSWC04>Norman, D.B., Sues, H.-D., Witmer, L.M., and Coria, R.A. (2004). Basal Ornithopoda. In: Weishampel, D.B., Dodson, P., and Osmólska, H. (eds.). ''The Dinosauria'' (second edition). University of California Press:Berkeley, 392-412. ISBN 0-520-24209-2</ref> Most recently, Galton (2006) considered it as a possibly valid basal [[Ornithopoda|ornithopod]], and pointed out similarities with [[Heterodontosauridae|heterodontosaurids]] in the thigh bone. He also tentatively assigned to it some teeth that had been referred to ''[[Drinker]]''.<ref name=PMG06/>
In 1973, [[Peter Galton]] and [[James A. Jensen|Jim Jenson]] described a partial skeleton ([[Brigham Young University|BYU ESM 163]] as of Galton, 2007<ref name=PMG07>Galton, P.M. (2007). Teeth of ornithischian dinosaurs (mostly Ornithopoda) from the Morrison Formation (Upper Jurassic) of the western United States. In: K. Carpenter (ed.). ''Horns and Beaks: Ceratopsian and Ornithopod Dinosaurs''. Indiana University Press:Bloomington and Indianapolis, 17-47. ISBN 0-253-34817-X</ref>) missing the head, hands, and tail as ''Nanosaurus (?) rex''.<ref name=GJ73>Galton, P.M., and Jensen, J.A. (1973). Skeleton of a hypsilophodontid dinosaur (''Nanosaurus (?) rex'') from the Upper Jurassic of Utah. ''Brigham Young University Geology Series'' 20:137-157.</ref> By 1977, he had determined that ''Nanosaurus agilis'' was quite different from ''N. rex'' and the new skeleton, and coined ''[[Othnielia]]'' for ''N. rex''.<ref name=PMG77>Galton, P.M. (1977). The ornithopod dinosaur ''Dryosaurus'' and a [[Laurasia]]-[[Gondwanaland]] connection in the Upper Jurassic. ''Nature'' 268:230-232.</ref> He referred ''Nanosaurus'' proper to the nebulous [[Fabrosauridae|"Fabrosauridae"]],<ref name=PMG78>Galton, P.M. (1978). Fabrosauridae, the basal family of ornithischian dinosaurs (Reptilia: Ornithischia). ''Palaeontologische Zeitschrift'' 52(1/2):138-159.</ref> but other authors, including [[Paul Sereno]], regarded it as a [[nomen dubium|dubious]] basal ornithischian of unknown affinities,<ref name=PCS91>Sereno, P.C. (1991). ''Lesothosaurus'', "fabrosaurids," and the early evolution of Ornithischia. ''Journal of Vertebrate Paleontology'' 11(2):168-197.</ref> or as a dubious hypsilophodontid.<ref name=NSWC04>Norman, D.B., Sues, H.-D., Witmer, L.M., and Coria, R.A. (2004). Basal Ornithopoda. In: Weishampel, D.B., Dodson, P., and Osmólska, H. (eds.). ''The Dinosauria'' (second edition). University of California Press:Berkeley, 392-412. ISBN 0-520-24209-2</ref> Most recently, Galton (2007) considered it as a possibly valid basal [[Ornithopoda|ornithopod]], and pointed out similarities with [[Heterodontosauridae|heterodontosaurids]] in the thigh bone. He also tentatively assigned to it some teeth that had been referred to ''[[Drinker]]''.<ref name=PMG07/>


==Paleobiology==
==Paleobiology==

Revision as of 23:45, 2 October 2008

Nanosaurus
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Sauropsida
Superorder:
Dinosauria
Order:
Ornithischia
Suborder:
Cerapoda
Infraorder:
Ornithopoda
Family:
Hypsilophodontidae?
Genus:
Nanosaurus

Marsh, 1877
Binomial name
Nanosaurus agilis

Nanosaurus ("small or dwarf lizard") is the name given to a genus of dinosaur from the Late Jurassic. Described by Othniel Charles Marsh in 1877, it is a poorly-known ornithischian of uncertain affinities. Its fossils are known from the Morrison Formation of Colorado and possibly Wyoming. It has often been illustrated in the popular literature (as a "tiny dinosaur"), leaving the impression that more is known about it than actually is. Most representations are actually of what is now called Othnielosaurus or Othnielia.

History and taxonomy

Marsh named three species of his new genus in 1877, two of which are today known to be dinosaurian:

He regarded both dinosaur species as small ("cat sized"[1] or "fox-sized"[2]) animals.[4]

With the 1881 reassignment of N. victor, matters stood static for most of the next century. Marsh had originally set up Nanosauridae for this genus, but it generally was included in Hypsilophodontidae after his death.

In 1973, Peter Galton and Jim Jenson described a partial skeleton (BYU ESM 163 as of Galton, 2007[5]) missing the head, hands, and tail as Nanosaurus (?) rex.[6] By 1977, he had determined that Nanosaurus agilis was quite different from N. rex and the new skeleton, and coined Othnielia for N. rex.[7] He referred Nanosaurus proper to the nebulous "Fabrosauridae",[8] but other authors, including Paul Sereno, regarded it as a dubious basal ornithischian of unknown affinities,[9] or as a dubious hypsilophodontid.[10] Most recently, Galton (2007) considered it as a possibly valid basal ornithopod, and pointed out similarities with heterodontosaurids in the thigh bone. He also tentatively assigned to it some teeth that had been referred to Drinker.[5]

Paleobiology

Because of the few remains, about all that can be said about Nanosaurus in life with any accuracy is that it was a small, bipedal, cursorial animal, probably an herbivore.[10]

References

  1. ^ a b c Marsh, O.C. (1877a). Notice of some new vertebrate fossils. American Journal of Science (Series 3) 14:249-256.
  2. ^ a b Marsh, O.C. (1877b). Notice of new dinosaurian reptiles from the Jurassic formations. American Journal of Science (Series 3) 14:514-516.
  3. ^ Marsh, O.C. (1881). Principle characters of American Jurassic dinosaurs. Part V. American Journal of Science 21:418-423.
  4. ^ George Olshevsky. "Re: Nanosaurus rex". Retrieved 2007-01-25.
  5. ^ a b Galton, P.M. (2007). Teeth of ornithischian dinosaurs (mostly Ornithopoda) from the Morrison Formation (Upper Jurassic) of the western United States. In: K. Carpenter (ed.). Horns and Beaks: Ceratopsian and Ornithopod Dinosaurs. Indiana University Press:Bloomington and Indianapolis, 17-47. ISBN 0-253-34817-X
  6. ^ Galton, P.M., and Jensen, J.A. (1973). Skeleton of a hypsilophodontid dinosaur (Nanosaurus (?) rex) from the Upper Jurassic of Utah. Brigham Young University Geology Series 20:137-157.
  7. ^ Galton, P.M. (1977). The ornithopod dinosaur Dryosaurus and a Laurasia-Gondwanaland connection in the Upper Jurassic. Nature 268:230-232.
  8. ^ Galton, P.M. (1978). Fabrosauridae, the basal family of ornithischian dinosaurs (Reptilia: Ornithischia). Palaeontologische Zeitschrift 52(1/2):138-159.
  9. ^ Sereno, P.C. (1991). Lesothosaurus, "fabrosaurids," and the early evolution of Ornithischia. Journal of Vertebrate Paleontology 11(2):168-197.
  10. ^ a b Norman, D.B., Sues, H.-D., Witmer, L.M., and Coria, R.A. (2004). Basal Ornithopoda. In: Weishampel, D.B., Dodson, P., and Osmólska, H. (eds.). The Dinosauria (second edition). University of California Press:Berkeley, 392-412. ISBN 0-520-24209-2
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