Ankylosaurs

Ankylosaurs

Ankylosaurs and the Nodosaurs, their cousins, are the familiar armored dinosaurs from the late Cretaceous period. They were covered with osteoderms or boney plates of protective armor, and the Ankylosaurs had a clubbed tail for added defense.  The Ankylosaurs and the Nodosaurs were large. Ankylosaurus, the largest Ankylosaur, reached lengths up to 30 feet and weight to 17000 lbs. Edmontonia, a Nodosaur, reached lengths of 22 feet and weighed up to 7000 lbs.  These dinosaurs were built close to the ground, wide barrel-chested, and quadrupedal. You can see them referred as the “tanks” of the dinosaur world, and would be quite challenging for a Tyrannosaur or raptor to attack; especially, the Ankylosaurs with their club tails. Many Tyrannosaurs including Tyrannosaurus rex have been found with broken and healed leg fractures. Those dinosaurs may have survived an encounter with an Ankylosaur. 

Ankylosaurs and the Nodosaurs were herbivores. They had good sized teeth for cutting or nipping low lying vegetation. Today, we find their fossilized teeth, osteoderms (armor plates), and bones. We have a great assortment of Ankylosaurus fossils for sale. Note – Ankylosaurus was a rare species composing of only 1% of the dinosaurs species found in the Hell Creek Formation. Authenticity guaranteed.

Species include the following –

Ankylosaurus magniventris – the largest Ankylosaur, Hell Creek Formation; 67-66 mya

Denversaurus schlessmani - a nodosaurid ankylosaurian dinosaur, Hell Creek Formation; 67-66 mya

Euplocephalus tutus – an Ankylosaur, Judith River / Two Medicine / Horseshoe Canyon Fm.; 76-75 mya

Edmontia rugosidens – a Nodosaur,  Judith River / Two Medicine / Horseshoe Canyon Fm.; 77-69 mya


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  1. Ankylosaurus scute
    $925.00

    An ultra rare, LARGE Top Quality Ankylosaurus osteoderm (bony armor plate) from the late Cretaceous of northern North America. A January Fossil of the Month. Ankylosaurus magniventris was the largest Ankylosaur which grew to 30 feet and 17000 pounds, and a body covered with this bony armor. A complete body osteoderm plate from an adult Ankylosaurus with exceptional surface articulation. The bone is the best quality with excellent color and patina. A nice high ridge across the top shown in the first photo. Incredible perservation. No cracks or restoration. Legally collected on private land in the Lance Creek Fm., Niobrara Co., Wyoming. Authenticity guaranteed. A special collector's quality Ankylosaur osteoderm. I do not see large top quality ostederms very often.

    DK22         SIZE: 3-3/4"  x  2-5/8"

    Note - Adding 16 new Ankylosaur - Nodosaur fossils in January 2023.       Link to Ankylosaur fossils catalog.

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  2. Denversaurus scute
    $850.00

    An EXTRA LARGE, High Quality Denversaurus schlessmani osteoderm (bony armor plate) from the late Cretaceous of northern North AmericaAn August Fossil of the Month. Denversaurus schlessmani was the Nodosaur which grew to 20 feet and 6000 pounds, and a body covered with this heavy bony armor. Nodosaur armor plates are thicker than the Ankylosaur plates. A complete body osteoderm plate from an adult Denversaurus. The bone is excellent quality with excellent color / patina. No cracks or restoration. Legally collected on private land in the Lance Creek Fm., Niobrara Co., Wyoming. Authenticity guaranteed. A collector's quality Nodosaur osteoderm. I do not see large ostederms very often.

    DK24         SIZE: 5-1/2"  x  4-1/2" 

    Note - Adding 10 new Ankylosaur - Nodosaur fossils in Auugust 2021.       Link to Ankylosaur fossils catalog.

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  3. Ankylosaurus scute
    $795.00

    A LARGE, High Quality Ankylosaurus osteoderm (bony armor plate) from the late Cretaceous of northern North AmericaAnkylosaurus magniventris was the largest Ankylosaur which grew to 30 feet and 17000 pounds, and a body covered with this bony armor. A complete body osteoderm plate from an adult Ankylosaurus. The bone is excellent quality with excellent color / patina. No cracks or restoration. Legally collected on private land in the Lance Creek Fm., Niobrara Co., Wyoming. Authenticity guaranteed. A collector's quality Ankylosaur osteoderm.  I do not see large ostederms very often.

    DK23         SIZE: 4-3/4"  x  3-5/8" 

    Note - Adding 10 new Ankylosaur - Nodosaur fossils in Auugust 2021.       Link to Ankylosaur fossils catalog.

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  4. Denversaurus scute
    $695.00

    A LARGE, Top Quality Denversaurus schlessmani osteoderm (bony armor plate) from the late Cretaceous of northern North America. Denversaurus schlessmani was the Nodosaur which grew to 20 feet and 6000 pounds, and a body covered with this heavy bony armor. Nodosaur armor plates are thicker than the Ankylosaur plates. A near complete body osteoderm plate from an adult Denversaurus with excellent surface articulation. The bone is excellent quality with excellent color / patina. No cracks or restoration. Legally collected on private land in the Lance Creek Fm., Niobrara Co., Wyoming. Authenticity guaranteed. An excellent collector's quality Nodosaur osteoderm. I do not see large top quality ostederms very often.

    DK24         SIZE: 4-1/8"  x  3-1/4" 

    Note - Adding 10 new Ankylosaur - Nodosaur fossils in Auugust 2021.       Link to Ankylosaur fossils catalog.

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  5. Ankylosaurus
    $495.00

    A rare, Top Quality Ankylosaurus magniventris tooth (rooted) from the late Cretaceous of North America.  Ankylosaurus magniventris was the largest Ankylosaur which grew to 30 feet and 17000 pounds. An ultra rare rooted tooth! Note - These incredibly sized dinosaurs had small teeth. The enamel is very good quality with excellent color / patina. The crown has one natural wear facet. No cracks or restoration. Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. Authenticity guaranteed. An excellent collector's quality rooted Ankylosaur tooth. Note - tooth comes with the gem case pictured.

    DK09      SIZE: 9/16"    (1/4" wide)

    Note - Adding 16 new Ankylosaur / Nodosaur fossils in January 2023.       Link to Ankylosaur fossils catalog.

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  6. Ankylosaurus
    $450.00

    A rare, Top Quality Ankylosaurus magniventris tooth from the late Cretaceous of North America.  Ankylosaurus magniventris was the largest Ankylosaur which grew to 30 feet and 17000 pounds. Note - These incredibly sized dinosaurs had small teeth. The enamel is very good quality with excellent color / patina. The crown has little wear. No cracks or restoration. Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. Authenticity guaranteed. An excellent collector's quality Ankylosaur tooth. Note - tooth comes with the gem case pictured.

    DK08      SIZE: 3/8"    (1/4" wide)

    Note - Adding 16 new Ankylosaur / Nodosaur fossils in January 2023.       Link to Ankylosaur fossils catalog.

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  7. Ankylosaur scute - Zuul
    $395.00

    A Top Quality Zuul crurivastator, Ankylosaur, osteoderm or scute (bony armor plate) from the late Cretaceous of North America. The Campanian age Ankylosaurs grew to 20 feet and 6000 pounds, and a body covered with this bony armor. The bone is exceptional quality with excellent color and patina. A complete scute from a juvenile Zuul Ankylosaur. Great osteoderm height - a extra hight ridge. ~76 MYA. Legally collected on private land in the Judith River Fm., Havre, Montana. Authenticity guaranteed. A collector's quality Ankylosaur osteoderm. 

    DK27         SIZE: 2-1/8"  (1-1/4" Height)

    Note - Adding 14 new Ankylosaur - Nodosaur fossils in December 2021.       Link to Ankylosaur fossils catalog.

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  8. Denversaurus - Nodosaur
    $375.00

    A LARGE, Top Quality Denversaurus schlessmani  tooth from the late Cretaceous of North AmericaDenversaurus schlessmani was the large Nodosaur which grew to 20 feet and 6000 pounds. The enamel is excellent quality with excellent color / patina. Crown has normal feeding wear. No cracks or restoration. Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. Authenticity guaranteed. An excellent collector quality large Denversaurus tooth. Note - tooth comes with the gem case pictured.

    DK01        SIZE: 9/16"   (7/16" Wide)

    Note - Adding 16 new Ankylosaur - Nodosaur fossils in January 2023.       Link to Ankylosaur fossils catalog.

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  9. Denversaurus - Nodosaur
    $350.00

    A LARGE, Top Quality Denversaurus schlessmani  tooth from the late Cretaceous of North AmericaDenversaurus schlessmani was the large Nodosaur which grew to 20 feet and 6000 pounds. The enamel is excellent quality with excellent color / patina. Crown has normal feeding wear. No cracks or restoration. Legally collected on private land in the Hell Creek Fm., Garfield Co., Montana. Authenticity guaranteed. An excellent collector quality large Denversaurus tooth. Note - tooth comes with the gem case pictured.

    DK03        SIZE: 9/16"   (7/16" Wide)

    Note - Adding 16 new Ankylosaur - Nodosaur fossils in January 2023.       Link to Ankylosaur fossils catalog.

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  10. Edmontonia - Nodosaur
    $325.00

    A Large, Top Qaulity Edmontonia rugosidens tooth from the late Cretaceous of northern North America. Edmontonia rugosidens was a large Nodosaur which grew to 20 feet and 6000 pounds. The enamel is very good quality with good color / patina. Very little natural wear. No cracks or restoration. ~76 MYA. Legally collected on private land in the Judith River Fm., Wheatfield Co., Montana. Authenticity guaranteed. A collector's quality Nodosaur tooth. Note - tooth comes with the gem case pictured.

    DK20       SIZE: 7/16"  (3/8" Wide)   

    Note - Adding 16 new Ankylosaur - Nodosaur fossils in January 2023.       Link to Ankylosaur fossils catalog.

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  11. Denversaurus - Nodosaur
    $295.00

    An Extra Large, Top Quality Denversaurus schlessmani  tooth from the late Cretaceous of North AmericaDenversaurus schlessmani was the large Nodosaur which grew to 20 feet and 6000 pounds. The enamel is very good quality with excellent color and patina. Crown has some feeding wear. No cracks or restoration. Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. Authenticity guaranteed. An excellent collector quality large Denversaurus tooth. Note - tooth comes with the gem case pictured.

    DK02        SIZE: 1/2"   (1/2" W)

    Note - Adding 15 new Ankylosaur / Nodosaur fossils in December 2020.       Link to Ankylosaur fossils catalog.

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  12. Denversaurus - Nodosaur
    $275.00

    A Top Quality Denversaurus schlessmani  tooth from the late Cretaceous of North AmericaDenversaurus schlessmani was the large Nodosaur which grew to 20 feet and 6000 pounds. The enamel is very good quality with excellent color / patina. Crown has normal feeding wear. No cracks or restoration. Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. Authenticity guaranteed. An excellent collector quality large Denversaurus tooth. Note - tooth comes with the gem case pictured.

    DK04        SIZE: 7/16"   (7/16" Wide)

    Note - Adding 16 new Ankylosaur - Nodosaur fossils in January 2023.       Link to Ankylosaur fossils catalog.

    Learn More

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