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  • 'Heterodontus' upnikensis


    Images:

    Anomotodon

    Taxonomy

    Kingdom: Animalia
    Phylum: Chordata
    Class: Chondrichthyes
    Order: Heterodontiformes
    Family: Heterodontidae
    Genus: 'Heterodontus'
    Species: 'H.' upnikensis
    Author Citation Dalinkevicius, 1935

    Geological Time Scale

    Eon: Phanerozoic
    Era: Mesozoic
    Period: Cretaceous
    Epoch: Early
    Age: Albian

    Stratigraphy

    Albian sediments of Kanev region, Ukraine

    Provenance

    Collector: Tim Sokolskyi
    Acquired by: Field Collection

    Location

    Melanchyn potik ravine, Kanev national reserve
    Kanev region
    Cherkasskaya oblast
    Ukraine

    Comments

    A - lateral;

    B, C, D - anteriors.

    Anterior teeth have typical of Heterodontus V-shaped root and marked cutting edge. Unlike H. canaliculatus anteriors, anteriors of ‘H.’ upnikensis have more convex labial side (so that cutting edge is situated in the middle of the lateral surface) and no lateral cusplets. Crown generally widens near the base, so most teeth have regular triangle shape of a labial face. Teeth located closer to symphysis display more mesiodistally compressed crowns. Enamel is smooth on both faces. Lateral teeth are also different from H. canaliculatus: they have lower and shorter central occlusal ridge and lateral ridges are highly anostomosed on both sides, so that complete tooth ornamentation has a net-like appearance.

     

    Heterodontusupnikensis is an enigmatic species. No associated tooth set has been found yet, consequently it is impossible to tell that a given set of laterals actually belong to ‘H.’ upnikensis. There is a possibility that lateral teeth described here as ‘H.’ upnikensis here belong to another Heterodontus species not represented by anteriors in Kanev collection. They were assigned to this species because there is generally some degree of tooth plan similarity between anteriors and laterals of the same species. Laterals described here have: 1) relatively weak and short central occlusal ridge; this trait is similar to ‘H.’ upnikensis shorter cutting edge because of lateral cusplet absence; 2) more bilateraly symmetrical crown shape and ornamentation across the central occlusal ridge than in H. canaliculatus; this feature is analogous to relatively equal thickness of labial and lingual face on ‘H.’ upnikensis anterior teeth. Also, anteriors of ‘H.’ upnikensis are a lot more common in studied locations than H. canaliculatus, and the same trend applies to two found Heterodontus lateral teeth morphotypes with H. canaliculatus teeth being a lot scarcer.



    User Feedback


    FossilDAWG

    Posted · Report

    Great photos and tons of great information.  Thanks for this impressive contribution.

     

    Don

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    Tidgy's Dad

    Posted · Report

    I'm a little confused here. 

    I recently posted a fossil and it was disqualified from collections, obliterated, presumably by the moderators. 

    I assumed it was because, when I studied the rules more carefully it was because only one specimen was permitted , though multiple shots were okay. Could someone please clarify the rules?

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    Anomotodon

    Posted · Report

    1 hour ago, Tidgy's Dad said:

    I'm a little confused here. 

    I recently posted a fossil and it was disqualified from collections, obliterated, presumably by the moderators. 

    I assumed it was because, when I studied the rules more carefully it was because only one specimen was permitted , though multiple shots were okay. Could someone please clarify the rules?

    I actually missed that part of the rules... I feel like it makes more sense to have all of these specimens on one picture rather than different ones, because of the analysis in the description section. So, I will wait for the moderators, if they say that is necessary, I will change the photo.

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    Tidgy's Dad

    Posted · Report

    I am not tying to get your super examples removed, I think they're excellent and should remain. I just wondered what had happened to mine. I have now been informed why mine was removed and fully understand.:)

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    On 10/13/2017 at 3:09 AM, Anomotodon said:

    I actually missed that part of the rules... I feel like it makes more sense to have all of these specimens on one picture rather than different ones, because of the analysis in the description section. So, I will wait for the moderators, if they say that is necessary, I will change the photo.

     

    Your photos are excellent and the admin team for Collections agrees that this sort of post is fine. :)

    Some photos of multiple specimens don't add to the reference quality of this section - the member's Gallery or Members Collections are the best places for these.

     

    The guidelines will be updated but there's a software issue at the moment... 

     

    Guideline no. 3, currently allowing only one specimen, will be extended to include something like:

    "Photos showing up to 4 specimens together may sometimes be appropriate in order to show significant variation within the species. The photos must be clear and well lit."

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    Fossildude19

    Posted · Report

    On 10/12/2017 at 8:27 PM, Tidgy's Dad said:

    I assumed it was because, when I studied the rules more carefully it was because only one specimen was permitted , and thought multiple shots were okay. 

    Multiple angles of the same specimen, or if on a mass mortality plate, (of the same species)  are fine. In fact, we encourage this.


    Multiple specimen shots are limited to 4. And as Tarquin stated, it is fine if the photos are clear well lit and cropped, and show variation in the species.

    Anyone can feel free to PM a mod or admin if there are questions about the Collections area. :) 

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    5 hours ago, TqB said:

     

    Your photos are excellent and the admin team for Collections agrees that this sort of post is fine. :)

    Some photos of multiple specimens don't add to the reference quality of this section - the member's Gallery or Members Collections are the best places for these.

     

    The guidelines will be updated but there's a software issue at the moment... 

     

    Guideline no. 3, currently allowing only one specimen, will be extended to include something like:

    "Photos showing up to 4 specimens together may sometimes be appropriate in order to show significant variation within the species. The photos must be clear and well lit."

    Thanks!

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