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Page 7: Sea Monsters at the Smithsonian

Tylosaurus
proriger
Cretaceous
Kansas


Basilosaurus cetoides
Eocene
Louisiana

Tylosaurus was a large mosasaur, a sea-going relative of the monitor lizards, were fairly common in the Cretaceous interior seaway that ran from the Gulf of Mexico to Montana. Basilosaurus is an early whale relative.
 

Megalodon
jaw reconstruction
with
fossil teeth
Miocene

 
Heptornus regalus
Late Cretaceous
Kansas
         
         
         
 

Protostega gigas
Kansas
Cretaceous

Dolichorhynchops
osborni
Late Cretaceous
Montana
Protostega was a medium to large sized sea turtle from the Cretaceous of Kansas. Dolinchorhynchops is small late cretaceous short necked pliosaur.
 
Ichthyosaurus sp.
Early Jurassic
Germany

Stenopterygius
quadricatus
Early Jurassic
Germany

Ichthyosaurs, two examples of which are shown above, are reptiles that evolved a form and a lifestyle similar to todays dolphins.
 

Xiphactinus audax
Cretaceous
Texas

Xiphactinus audax
Cretaceous
Texas
 
A famous fossil of Xiphactinus, a very large fish that grew up to 17 feet or larger. The fossil contains the remains of another fish which it must have eaten just before dying itself.
 
Ichthyodectes
anaides
Cretaceous
Kansas
 
Isotelus maximus
Late Ordovician
Ohio
         
 
 

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