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Tylosaurus
proriger
Cretaceous
Kansas
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Basilosaurus cetoides
Eocene
Louisiana
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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.
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Megalodon
jaw reconstruction
with
fossil teeth
Miocene
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Heptornus regalus
Late Cretaceous
Kansas
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Protostega gigas
Kansas
Cretaceous
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Dolichorhynchops
osborni
Late Cretaceous
Montana
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| Protostega was a medium to large sized sea turtle from the Cretaceous of Kansas. Dolinchorhynchops is small late cretaceous short necked pliosaur. |
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Ichthyosaurus sp.
Early Jurassic
Germany
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Stenopterygius
quadricatus
Early Jurassic
Germany
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Ichthyosaurs, two examples of which are shown above, are reptiles that evolved a form and a lifestyle similar to todays dolphins.
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Xiphactinus audax
Cretaceous
Texas
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Xiphactinus audax
Cretaceous
Texas
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| 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. |
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Ichthyodectes
anaides
Cretaceous
Kansas
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Isotelus maximus
Late Ordovician
Ohio
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