Thescelosaurus

Thescelosaurus

Thescelosaurus or "marvelous lizard" was a mid-size dinosaur from the late Cretaceous that roamed the northwest US. They were bipedal and reached a length of 13 feet. Fossil remains include well preserved teeth, bones, and claws, and are highly valued by collectors. These top quality specimens were all legally collected from private lands in the northwestern US. Late Cretaceous, Hell Creek Fm. (or equivalent), 68-66 MYA.

Thescelosaurus fossils are less abundant than the large theropods and herbiovores in the Hell Creek Fm. A dinosaur census conducted by the Hell Creek Project calculated relative abundance of the Thescelosaurus was 8% of the population. Today, we find fossilized teeth, unguals (claws), spikes, and non-associated bones. Authenticity guaranteed.

Thescelosaurus tooth identification. Thescelosaurus teeth are routinely identified and sold as Pachycephalosaurus teeth since they maxillary teeth have similar shape and size. There has been some good work done presented in the Fossil Forum. The Fossil Forum author concludes that Pachycephalosaurus maxillary teeth can be differentiated from Thescelosaurus teeth since the Pachy teeth exhibit “vertical ridges are more pounced, fewer and a more prominent center ridge may exist. There is also no symmetry with the crowns.” Several good photographic references are provided. Link to the Fossil Forum discussion. A dominant center ridge appears to be consistent and lack of symmetry on the crown appeared in most of the Pachycepholsaur reference teeth.  That said, rooted teeth from both species are scarce and are highly collectable.

Thescelosaurus ungual (claw) identification. Thescelosaurus unguals (claws) are routinely identified and sold as Pachycephalosaurus unguals as they have a similar shape and size. Unfortunately there is little reference data for Pachycephalosaurus unguals with only one Pachy specimen with partial legs found. Per my discussion with the primary Fossil Forum Hell Creek dinosaurs author, he suggested “to differentiate between the two is Thescelosaurus claws are flat and triangular and the ones with a twist are Pachy”. That said, unguals  (claws) from both species are rare and are highly collectable.


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  1. Thescelosaurus
    $95.00

    A Top Quality Thescelosaurus neglectus caudal (tail) vertebra from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. This bone quality is excellent with excellent color and patina. No repair or restoration. Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. An excellent collector's quality Thescelosaurus vertebra. Authenticity guaranteed.

    DI46       SIZE: 1-3/8"  x  1" x  1-5/8" height

    Note - Adding 23 new Thescelosarus fossils in March 2022.   Link to Thesc fossils catalog

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  2. Thescelosaurus
    $95.00

    A Top Quality Quality Thescelosaurus neglectus maxillary tooth from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. The enamel is excellent quality with excellent color / patina. Note - Thescelosaurus maxillary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An excellent Thescelosaurus tooth crown! Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. An excellent collector's quality Thescelosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DI06       SIZE: 3/16"    

    Note - Adding 16 new Thescelosarus fossils in March 2021.       Link to Thescelosaurus fossils catalog

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  3. Thescelosaurus
    $85.00

    A Top Quality Thescelosaurus neglectus premaxillary tooth from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. The enamel is excellent quality with excellent color / patina. Note - Thescelosaurus premaxillary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An excellent Thescelosaurus tooth crown! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. Excellent collector's quality Thescelosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DI09       SIZE: 5/16"    

    Note - Adding 10 new Thescelosarus teeth in July 2022.       Link to Thescelosaurus fossils catalog

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  4. Thescelosaurus
    $75.00

    A Top Quality Thescelosaurus neglectus toe bone from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. This bone has excellent quality with excellent color / patina. No repair or restoration. Legally collected on private land in the Hell Creek Fm., Garfield Co., Montana. Excellent collector's quality Thescelosaurus toe bones. Authenticity guaranteed.

    DI35       SIZE: 1-3/16"  

    Note - Adding 23 new Thescelosarus fossils in March 2022.   Link to Thesc fossils catalog

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  5. Thescelosaurus
    $75.00

    A Top Quality Thescelosaurus neglectus premaxillary tooth from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. The enamel is excellent quality with excellent color / patina. Note - Thescelosaurus premaxillary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An excellent Thescelosaurus tooth crown! Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. Excellent collector's quality Thescelosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DI11       SIZE: 3/8"    

    Note - Adding 10 new Thescelosarus teeth in July 2022.       Link to Thescelosaurus fossils catalog

    Learn More
  6. Thescelosaurus
    $75.00

    A Top Quality Quality Thescelosaurus neglectus maxillary tooth from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. The enamel is excellent quality with excellent color / patina. Note - Thescelosaurus maxillary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. An excellent collector's quality Thescelosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed. 

    DI14        SIZE: 5/16"    

    Note - Adding 10 new Thescelosarus teeth in July 2022.   Link to Thescelosaurus fossils catalog

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  7. Thescelosaurus
    $75.00

    Two Top Quality Thescelosaurus neglectus teeth (a premaxillary and a maxillary tooth) from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. The enamel is excellent quality with excellent color / patina. Note - Thescelosaurus premaxillary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. Two nice Thescelosaurus teeth crowns! Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. Excellent collector's quality Thescelosaurus teeth. Note - teeth come with the gem case pictured. Authenticity guaranteed.

    DI15       SIZE: 1/4"    

    Note - Adding 16 new Thescelosarus fossils in March 2021.       Link to Thescelosaurus fossils catalog

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  8. Thescelosaurus
    $75.00

    Two Top Quality Thescelosaurus neglectus teeth (2 premaxillary teeth) from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. The enamel is excellent quality with excellent color / patina. Note - Thescelosaurus premaxillary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. Two nice Thescelosaurus teeth crowns! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. Excellent collector's quality Thescelosaurus teeth. Note - teeth come with the gem case pictured. Authenticity guaranteed.

    DI12       SIZE: 5/16"    

    Note - Adding 16 new Thescelosarus fossils in March 2021.       Link to Thescelosaurus fossils catalog

    Learn More
  9. Thescelosaurus
    $70.00

    A Top Quality Thescelosaurus neglectus premaxillary tooth from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. The enamel is excellent quality with excellent color / patina. Note - Thescelosaurus premaxillary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. There is a small natural wear facet on the tip. An excellent Thescelosaurus tooth crown! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. Excellent collector's quality Thescelosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DI08       SIZE: 3/8"    

    Note - Adding 10 new Thescelosarus teeth in July 2022.       Link to Thescelosaurus fossils catalog

    Learn More
  10. Thescelosaurus
    $65.00

    A Top Quality Thescelosaurus neglectus premaxillary tooth from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. The enamel is excellent quality with excellent color / patina. Note - Thescelosaurus premaxillary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An excellent Thescelosaurus tooth crown! Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. Excellent collector's quality Thescelosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DI13        SIZE: 3/8"    

    Note - Adding 10 new Thescelosarus teeth in July 2022.       Link to Thescelosaurus fossils catalog

    Learn More
  11. Thescelosaurus
    $65.00

    A Top Quality Quality Thescelosaurus neglectus maxillary tooth from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. The enamel is excellent quality with excellent color / patina. Note - Thescelosaurus maxillary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. The tip has a natural wear facet. Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. An excellent collector's quality Thescelosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed. 

    DI05        SIZE: 1/4"    

    Note - Adding 10 new Thescelosarus teeth in July 2022.   Link to Thescelosaurus fossils catalog

    Learn More
  12. Thescelosaurus
    $65.00

    A Top Quality Thescelosaurus neglectus toe bone from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. This bone has excellent quality with excellent color / patina. No repair or restoration. Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. Excellent collector's quality Thescelosaurus toe bones. Authenticity guaranteed.

    DI38       SIZE: 1-1/8"  

    Note - Adding 23 new Thescelosarus fossils in March 2022.   Link to Thesc fossils catalog

    Learn More

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