Hesperosaurus

Hesperosaurus
Fossil range: Late Jurassic
Enlarge picture
Hesperosaurus mjosi - artist Ken Carpenter, 2006

Hesperosaurus mjosi - artist Ken Carpenter, 2006
Conservation status
Extinct (fossil)
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Sauropsida
Superorder:Dinosauria
Order:Ornithischia
Suborder:Thyreophora
Infraorder:Stegosauria
Family:Stegosauridae
Genus:Hesperosaurus
Carpenter, Miles & Cloward, 2001
Species


H. mjosi
Hesperosaurus (meaning "western lizard", from Classical Greek, έσπερο-/hespero- "western" and σαυρος/saurus "lizard") was an herbivorous dinosaur from the Kimmeridgian to Tithonian epochs of the Jurassic period (approximately 150 million years ago), whose fossils are found in the state of Wyoming in the United States of America. It is from an older part of the Morrison Formation, and so a little older than other Morrison Stegosaurs.

Hesperosaurus was a type of stegosaurid, having alternating plates on its back and four spikes on its tail. The plates on its back were not as tall, but were longer, than in its cousin Stegosaurus. It had a shorter, broader skull than Stegosaurus and appears most closely related to Dacentrurus.

Discovery and Species

It was described by Kenneth Carpenter in 2001. He gave it its name for its location in the western United States. A nearly complete skull and much of the skeleton was found.

Hesperosaurus Species
  • H. mjosi

References

  • Carpenter K, Miles CA, Cloward K (2001). "New Primitive Stegosaur from the Morrison Formation, Wyoming", in Carpenter, Kenneth(ed): The Armored Dinosaurs. Indiana University Press, 55–75. ISBN 0-253-33964-2. 

External links

Late Jurassic (or Malm) Epoch of the Jurassic Period is the unit of geologic time from 161.2 ± 4.0 to 145.5 ± 4.0 million years ago, which is preserved in Upper Jurassic strata.
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Kenneth Carpenter (born September 21, 1949 in Tokyo, Japan) is a Paleontologist at the Denver Museum of Natural History and author or co-author of a number of books on dinosaurs and Mesozoic life.
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conservation status of a species is an indicator of the likelihood of that species continuing to survive either in the present day or the future. Many factors are taken into account when assessing the conservation status of a species: not simply the number remaining, but the
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For other uses of the term, see Fossil (disambiguation)


FOSSIL is a standard for allowing serial communication for telecommunications programs under the DOS operating system.
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Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. Scientific classification also can be called scientific taxonomy, but should be distinguished from folk taxonomy, which lacks scientific basis.
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Chordata
Bateson, 1885

Typical Classes

See below

Chordates (phylum Chordata) are a group of animals that includes the vertebrates, together with several closely related invertebrates.
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Sauropsida*
Goodrich, 1916

Subclasses
  • Anapsida
  • Diapsida
Synonyms
  • Reptilia Laurenti, 1768
Reptiles are tetrapods and amniotes, animals whose embryos are surrounded by an amniotic membrane, and members of the class
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Dinosauria *
Owen, 1842

Orders & Suborders
  • Ornithischia
  • Cerapoda
  • Thyreophora
  • Saurischia

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Ornithischia
Seeley, 1888

Suborders
  • Cerapoda
  • Thyreophora


Ornithischia or Predentata is an order of beaked, herbivorous dinosaurs.
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Thyreophora
Nopcsa, 1915

Infraorders
  • Ankylosauria
  • Stegosauria


The Thyreophora ("shield bearers", often known simply as "armored dinosaurs" - Greek: θυρεος
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Stegosauria
Marsh, 1877

Families

Huayangosauridae
Stegosauridae

Known colloquially as stegosaurs, the Stegosauria are a group of herbivorous dinosaurs of the Jurassic and Early Cretaceous Periods, being found mostly in the Northern
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Stegosauria
Marsh, 1877

Families

Huayangosauridae
Stegosauridae

Known colloquially as stegosaurs, the Stegosauria are a group of herbivorous dinosaurs of the Jurassic and Early Cretaceous Periods, being found mostly in the Northern
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Kenneth Carpenter (born September 21, 1949 in Tokyo, Japan) is a Paleontologist at the Denver Museum of Natural History and author or co-author of a number of books on dinosaurs and Mesozoic life.
..... Click the link for more information.
21st century - 22nd century
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species is one of the basic units of biological classification. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring.
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Ancient Greek refers to the second stage in the history of the Greek language[1] as it existed during the Archaic (9th–6th centuries BC) and Classical (5th–4th centuries BC) periods in Greece.
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Dinosauria *
Owen, 1842

Orders & Suborders
  • Ornithischia
  • Cerapoda
  • Thyreophora
  • Saurischia

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The Kimmeridgian is a stage of the Late Jurassic Epoch. It spans the time between 155.7 ± 4 Ma and 150.8 ± 4 Ma (million years ago).

The stage takes its name from the village of Kimmeridge on the Dorset coast, England where the exposure is at its greatest extent.
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The Tithonian is the final stage of the Late Jurassic Epoch. It spans the time between 150.8 ± 4 Ma and 145.5 ± 4 Ma (million years ago). It is followed by the Berriasian stage of the Early Cretaceous Epoch.
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The Jurassic Period is a major unit of the geologic timescale that extends from about 199.6 ± 0.6 Ma (million years ago) to 145.4 ± 4.0 Ma, the end of the Triassic to the beginning of the Cretaceous.
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State of Wyoming

Flag of Wyoming Seal of Wyoming
Nickname(s): Equality State, Cowboy State,
Motto(s): Equal rights

Official language(s) English

Capital Cheyenne
Largest city
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Motto
"In God We Trust"   (since 1956)
"E Pluribus Unum"   ("From Many, One"; Latin, traditional)
Anthem
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Morrison Formation is a distinctive sequence of Late Jurassic sedimentary rock that is found in the western United States and Canada, which has been the most fertile source of dinosaur fossils in North America.
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Stegosauria
Marsh, 1877

Families

Huayangosauridae
Stegosauridae

Known colloquially as stegosaurs, the Stegosauria are a group of herbivorous dinosaurs of the Jurassic and Early Cretaceous Periods, being found mostly in the Northern
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Stegosaurus
Marsh, 1877

Species
  • S. armatus Marsh, 1877 (type)
  • S. stenops Marsh, 1887
  • S. longispinus Gilmore, 1914


Stegosaurus (IPA:
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Dacentrurus
Lucas, 1902

Species

D. armatus

Dacentrurus ("very sharp tail"), originally known as Omosaurus, was a large stegosaur of the late Jurassic Period (154 - 150 mya).
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Kenneth Carpenter (born September 21, 1949 in Tokyo, Japan) is a Paleontologist at the Denver Museum of Natural History and author or co-author of a number of books on dinosaurs and Mesozoic life.
..... Click the link for more information.
21st century - 22nd century
1970s  1980s  1990s  - 2000s -  2010s  2020s  2030s
1998 1999 2000 - 2001 - 2002 2003 2004

2001 by topic:
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Jan - Feb - Mar - Apr - May - Jun
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