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
    $60.00

    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 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.

    DI10       SIZE: 5/16"    

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

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  2. Thescelosaurus
    $45.00

    A Thescelosaurus neglectus toe bone section from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. No repair or restoration. Legally collected on private land in the Hell Creek Fm., Garfield Co., Montana. Collector's quality Thescelosaurus toe bone. Authenticity guaranteed.

    DI37       SIZE: 1-3/16"  

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

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  3. Thescelosaurus
    $0.00

    A Top 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. No wear faucet from grinding on opposing teeth. Note - no strong center ridge and good crown symmetry (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. A rare rooted Thesc maxillaryAuthenticity guaranteed. An excellent collector's quality Thescelosaurus tooth. My best rooted Thesc maxillary tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DI01 BoP      SIZE: 11/16"    

    Note - Adding 17 new Thescelosarus fossils in July 2018.       Link to Thesc fossils catalog

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  4. Thescelosaurus
    $0.00

    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. Minor wear faucet from grinding on opposing teeth. Note - Thesc premaxillary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. A rare rooted Thesc premaxillary tooth! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Thescelosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DI07 BoP      SIZE: 11/16"    

    Note - Adding 17 new Thescelosarus fossils in July 2018.       Link to Thesc fossils catalog

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  5. Thescelosaurus
    $0.00

    An EXTRA LARGE, Top Quality Thescelosaurus neglectus pes ungual (foot claw) from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. This claw is excellent quality with excellent color and patinaOne stress crack which was stabilized stabilized - no repair or no restoration. A super rare, extra large Thescelosaurus pes ungual! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An exceptional collector's quality Thescelosaurus claw. Maximum size. Note - claw comes with a Riker type frame. Authenticity guaranteed. Note - Thesc unguals are described as flat triangles.(see Thesc-Pachy claw differentiation discussion below). 

    DI21 BoP       SIZE: 2-1/2"    (1-1/4" W)

    Note - Adding 4 new Thescelosarus claws in July 2018.       Link to Thesc fossils catalog

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  6. Thescelosaurus
    $0.00

    A Top Quality Thescelosaurus neglectus pes ungual (foot claw) from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. This claw is excellent quality with excellent color / patina. A little erosion at the tip, but otherwise a perfect claw. Note - Thesc unguals are described as flat triangles.(see Thesc-Pachy claw differentiation discussion below). No repair and no restoration. A rare Thescelosaurus pes ungual! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. Excellent collector's quality Thescelosaurus claw. Note - claw comes with a Riker type frame. Authenticity guaranteed.

    DI22 BoP        SIZE: 1-15/16"  

    Note - Adding 4 new Thescelosarus claws in July 2018.       Link to Thesc fossils catalog

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  7. Thescelosaurus
    $0.00

    A High Quality Thescelosaurus neglectus pes ungual (foot claw) from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. This claw is excellent quality with excellent color / patina. One crack is stabilized and the very end of the "wings" (the flat ledge below the blood groove) were filled for aesthetics - about a 1/16". Note - Thesc unguals are described as flat triangles.(see Thesc-Pachy claw differentiation discussion below). No restoration. A rare Thescelosaurus pes ungual! Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. Excellent collector's quality Thescelosaurus claw. Note - claw comes with a Riker type frame. Authenticity guaranteed.

    DI24        SIZE: 1-11/16"  

    Note - Adding 4 new Thescelosarus claws in July 2018.       Link to Thesc fossils catalog

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  8. Thescelosaurus
    $0.00

    A rare, Top Quality Thescelosaurus neglectus rooted 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 - Thesc maxillary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An exceptional Thescelosaurus rooted tooth! 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. 

    DI01 BoP2      SIZE: 9/16"  

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

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