What are Ichthyosaurs?
What caused the ichthyosaurs to go back to the sea, caused them to flourish for so long, and what caused them to die out, are all still mysteries, but what we do know is fascinating none the less.
Smithsonian Ichthyosaur
In the National Museum of Natural History: Hall of Fossils

Picture via Creative Commons from Ryan Somma
Table of Contents
- What Are Ichthyosaurs?
- Installing an Ichthyosaur in a Museum
- Pregnant Ichthyosaur Fossil
- Blogs Mentioning Ichthyosaurs
- Sea Monsters 3D: A Prehistoric Adventure
- Berlin-Ichtyosaur State Park
- Their Eyes
- Sea Monsters 2 - Nothosaurs and Cymbospondylus
- Chased By Sea Monsters
- Books About Ichthyosaurs
- Purchase Prints of Ichthyosaurs Skeletons
- More Information on Ichthyosaurs
- Ichthyosaur Mentions on Twitter
- Cool Ichthyosaur Stuff
- What Do You Think of Ichthyosaurs?
- More About Me
What Are Ichthyosaurs?
Ichthyosaurs (Greek for "fish lizard" - ?????/ichthys meaning "fish" and ??????/sauros meaning "lizard") were giant marine reptiles that resembled fish and dolphins. Ichthyosaurs thrived during much of the Mesozoic era; based on fossil evidence, they first appeared approximately 245 million years ago (mya) and disappeared about 90 million years ago, about 25 million years before the dinosaurs became extinct. During the middle Triassic Period, ichthyosaurs evolved from as-yet unidentified land reptiles that moved back into the water, in a development parallel to that of the ancestors of modern-day dolphins and whales. They were particularly abundant in the Jurassic Period, until they were replaced as the top aquatic predators by plesiosaurs in the Cretaceous Period. They belong to the order known as Ichthyosauria or Ichthyopterygia ('fish flippers' - a designation introduced by Sir Richard Owen in 1840, although the term is now used more for the parent clade of the Ichthyosauria).
An Ichthyosaur Smile

Picture via Creative Commons from Kevan
Installing an Ichthyosaur in a Museum
Pregnant Ichthyosaur Fossil
An Ichthyosaur Specimen

Picture via Creative Commons from Ryan Somma
Blogs Mentioning Ichthyosaurs
- Classically reptillian traits of ichthyosaur - Talk Rational!
- Classically reptillian traits of ichthyosaur Evolution and Origins.
- A Plesiosaur That Ate Ichthyosaurs for Lunch | Dinosaur Tracking
- among the preserved stomach contents of the partially-complete plesiosaur skeleton there were a series of small, ring-shaped bones.
- Ichthyosaur! on Flickr - Photo Sharing!
- Ichthyosaur! Ichthyosaur! by LadyCrafthole. View On Black. To take full advantage of Flickr, you should use a JavaScript-enabled browser and install the latest version of the Macromedia Flash Player. ...
Sea Monsters 3D: A Prehistoric Adventure
by pacsci
Check out the link below for purchasing information or check with your local IMAX theater to see if they're going to play it again. It's a bit short, but very intense and interesting.
Sea Monsters
Sea Monsters: A Prehistoric Adventure (National Geographic) [Blu-ray]
Amazon Price: $17.99 (as of 01/07/2010)![]()
The movie in its entirety from which the trailer above was taken. It is really very attractively done and fairly accurate. Perhaps a bit scary for kids below seven or so since everyone wants to eat everyone else in the movie, but it really captures the imagination of older kids and even adults.
Berlin-Ichtyosaur State Park
In Central Nevada
No one is quite sure of the entire story, it's difficult to discern clues from ages-old fossils, but the story of what might have happened to cause the ichthyosaurs to be at Berlin-Ichthyosaur State Park is:
Millions and millions of years ago, the west coast of what is now the United States was not where it is today. It was in the middle of Nevada, so the sea lapped over all of what is now California, and quite a bit of Nevada. These seas were rich in life, much as our seas are today. There were fish and predators and lots of small creatures. One of the predators of the time was the ichthyosaur, filling the niche that is now occupied by the whales and dolphins. They cruised the seas, looking for food, and possibly migrating as whales do today. There was a group of composed of 37 individuals of the largest type of ichthyosaur known to us, the Shonisaurus popularis. They came into the sea above what is now Nevada, why we don't know. Could they have been following food? Coming in the birth their young? On a migration route? We don't know, but for some reason, they were there.
This group of Shonisaurus came to a sudden demise though. All of a sudden, they died and were buried, likely by an underwater landslide dropping tons of dirt upon them in a rapid burial of a massive degree. The Shonisaurus bodies buried under the pile were all overlapped, one carcass lying atop another. As time passed, more dirt built up over top of the Shonisaurus, and their bodies were fossilized. Millions of years later, the seas receded, the land rose, mountains formed, and eventually the coast came to be where it is now. Somewhere along the line, the burial location of the Shonisaurus was became home to numerous small faults and the covering landscape started to be eroded away.
In 1928, Dr. Siemon Muller, discovered, in an exposed portion, the first fossils of what we now call Shonisaurus popularis. Berlin-Ichthyosaur State Park is quite in the boonies today, imagine it over eighty years ago. Excavations finally commenced in 1954 with Dr. Charles Camp directing them. Over 40 ichthyosaurs have been discovered in the area since.
For more information about Shonisaurus popularis at Berlin-Ichthyosaur State Park, check out this site: The Oceans of Kansas
Visiting Berlin-Ichthyosaur Park
Many of the ichthyosaur fossils are housed on site, in situ, in the fossil house, tours are limited to the mid-spring, summer, and early-fall, so if you want to see the fossils, you have to come at the right time. The tour schedule varies, so contact the park to know when you should go, by calling (775) 964-2440. Also visiting Berlin-Ichthyosaur State Park website will give you more information.
Location of Berlin-Ichthyosaur State Park
In 1984, Shonisaurus popularis became the State Fossil of Nevada
Shonisaurus popularis Painting
Berlin-Ichthyosaur State Park

A life-sized painting done of Shonisaurus popularis, the type of ichthyosaur found at the Berlin-Ichthyosaur State Park in Nevada.
Picture via Creative Commons from Me
Shonisaurus popularis
Shonisaurus is the largest ichthyosaur and marine reptile that has yet been found.Hilton, Richard P., Dinosaurs and Other Mesozoic Animals of California, University of California Press, Berkeley 2003 ISBN 0-520-23315-8, at pages 90-91. Fossils of Shonisaurus were first found in a large deposit in Nevada in 1920. Thirty years later, they were excavated, uncovering the remains of 37 very large ichthyosaurs. These were named Shonisaurus, which means "Lizard from the Shoshone Mountains", after the formation where the fossils were found.
Shonisaurus lived during the Norian stage of the late Triassic period. The better known S. popularis species was around long, but a more recently discovered species, S. sikkanniensis, was longer still, at .
Shonisaurus had a long pointed mouth that contained teeth only at the front end. It had a whale-like body, and its flippers were much longer, and narrower than in other ichthyosaurs. All of these features suggest that Shonisaurus may be a relatively specialised offshoot of the main ichthyosaur evolutionary line.
Inside the Fossil House
Berlin-Ichthyosaur State Park

Though it didn't show up well in this picture, the fossil bed at Berlin-Ichthyosaur State Park is full of ichthyosaurs. Somehow, ichthyosaur bodies were piled up in this spot, perhaps buried by an underwater landslide, and the area was then buried even more and the bodies were fossilized. It's almost like a puzzle now, trying to figure out which parts go to which ichthyosaurs, since they are all overlaying each other and then the area was faulted, so the pieces aren't always next to where the other parts are.
Picture via Creative Commons from Me
Ichthyosaur Skull
Berlin-Ichthyosaur State Park

More ichthyosaur fossils inside the fossil house at Berlin-Ichthyosaur State Park.
Picture via Creative Commons from Me
Their Eyes
Ichthyosaurs are considered to have the biggest eyes ever known proportionally. Their eyes were enormous and even if we were the size of one of the ichthyosaurs our eyes wouldn't even be as big as their pupils.
Sea Monsters 2 - Nothosaurs and Cymbospondylus
From Chased By Sea Monsters
Chased By Sea Monsters
Chased by Sea Monsters
Amazon Price: (as of 01/07/2010)![]()
This movie looks very real and seems like an actual wildlife documentary. It includes the segment shown above, as well as many more encounters with prehistoric marine creatures. I really love how realistic most of this movie looks. There are a few fakey moments, but overall the movie really gives one the impression of being in a prehistoric ocean with dangerous sea creatures all around.
An Ichthyosaur in the the Smithsonian

Picture via Creative Commons from Ryan Somma
Ichthyosaurs

Picture via Creative Commons from tigerhawkvok
Books About Ichthyosaurs
Purchase Prints of Ichthyosaurs Skeletons
Ichthyosaur at Boston Museum of Science

This picture looks a lot like a dolphin doesn't it? If there wasn't a tag, you might actually think it was one, except there's something off. Though their bodies were really similar, dolphins and ichthyosaurs deviated on one important thing especially, their tails. Dolphins, like most mammals, have tails that move up-and-down and that are wide. Ichthyosaurs, like fish and reptiles, have tails that move side-to-side and that are tall. Ichthyosaurs lived in the same place and filled the same biological niche as dolphins though, so it makes sense that they would seem similar, they lived parallel lives.
Picture via Creative Commons from Pathfinder Linden
More Information on Ichthyosaurs
- Locomotion and Respiration in Marine Air-Breathing Vertebrates
- An interesting scientific account of how marine vertebrates moved and breathed. The ichthyosaur section is about 2/3rds down.
- The Ichthyosaur Page
- An in depth, but easy to understand page about ichthyosaurs. This is a very good page.
Ichthyosaur Mentions on Twitter
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- talkrational
- New Thread: Classically reptillian traits of ichthyosaur: Ok, this is a post to actually understand the ichthyosaur... http://bit.ly/70VwrX
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- BiologyImageLib
- Image of the Day: Fossil of Ichthyosaur vertebra by Dr. Tim Arnett @UCLResearch (University College London) http://bit.ly/7zi6Hq #biologypix
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- trpfontaine
- RT @EatMyHalo Bono created his name using the "bon" of bon voyage & the "o" of ichthyosaur. In sanskrit it is pronounced "Geldof" #bonofacts
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- EatMyHalo
- Bono created his name using the "bon" of bon voyage, and the "o" of ichthyosaur. In sanskrit, it is pronounced "Geldof" #bonofacts
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- JMOKC
- RT @Yo_Squirrely "Ichthyosaur became a state symbol in 1977 as the Nevada state fossil." //Thought Crypt Keeper Reid was NV State Fossil
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Cool Ichthyosaur Stuff
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What Do You Think of Ichthyosaurs?
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