My Collection

[Runner64]

3 hours ago, Jaimin013 said:

@Troodon @Runner64 I have heard back from Christophe and he has said that he is quite confident that the tooth I acquired as well as the isolated teeth tentatively ascribed to abelisaurid theropods by Maganuco et al. (2005) do belong to Abelisauridae. In fact, their morphology is exactly the same as that of the teeth of Late Cretaceous abelisaurids such as Majungasaurus. It actually leads him to think that those isolated abelisaurid teeth may not come from Middle Jurassic deposits but were washed out from Late Cretaceous ones that used to cover them. Otherwise, this means that the dentition of Malagasy abelisaurids did not evolve at all for almost 100 million of years, which he finds totally anomalous. Another explanation would be that they belong to non-abelisaurid theropods which convergently evolved the exact same teeth 100 millions of years before, which he would also find unlikely.

If the seller didn’t have an exact location, I believe a much more likely situation may be they were unaware of the formation they were in or it was washed downstream. 

If it does have the EXACT same dental features of the late Cretaceous Majungasaurus, I doubt a species would remain unchanged for tens of millions of years. While convergent evolution is possible I suppose, I think there's a higher probability of it coming from a different location than the seller stated.  Also, has the light brown preservation been observed in the Isalo? The one in your possession and the Neoabelisaurid highlighted in the paper are the only ones I’ve seen before.

[Jaimin013]

@Troodon @Runner64

 

So an update from C Hendrickx is that the CBR of my tooth is in the range of the CBR for abelisaurid teeth from the distal part of the mesial dentition. Based on the photos I sent him, he would classify this tooth as an Abelisaurid indet., believing that it may have just been found in Cretaceous deposits instead of Middle Jurassic ones. Because he would remain cautious in assigning the tooth to a Middle Jurassic abelisaurid. And if the tooth does come from Middle Jurassic deposits, then it may possibly belong to another theropod like a basal ceratosaur, in which the teeth are surprisingly similar to those of abelisaurids from the Late Cretaceous of Madagascar.

[Troodon]

Ha ha verifies my call its an Abelisaurid.  But more important thats been my point all along that the provenance of all material from Madagascar is very problematic and its even more so depending on the seller.   The morphology sometimes can give us clues like your tooth.  Thanks for the update

[Jaimin013]

On 04/05/2020 at 2:47 AM, Troodon said:

Ha ha verifies my call its an Abelisaurid.  But more important thats been my point all along that the provenance of all material from Madagascar is very problematic and its even more so depending on the seller.   The morphology sometimes can give us clues like your tooth.  Thanks for the update

For sure and no problem!

[Jaimin013]

Sauropod tooth from Big Horn Basin

Morrison Formation, Wyoming

 

A well known paleontologist potentially thinks that tooth morphology doesn't match Diplodocus or Apatosaurus as was advertised by the seller and that it could belong to Kaatedocus. They have compared it to a cast of a Kaatedocus skull they have. I have also compared the tooth to pics of the skull described in a publication and against a skull cast of a juvenile Diplodocus.

 

Kaatedocus is a genus of diplodocine flagellicaudatan sauropod known from the middle Late Jurassic of northern Wyoming, United States. It's known from well-preserved skull and cervical vertebrae which were collected in the lower part of the Morrison Formation. The type and only species is Kaatedocus siberi and it's estimated to be about 46 feet (14 metres) long and lived earlier than Diplodocus and was smaller too. The original specimen was found further North than other diplodocids from the Morrison Formation so it's possible that they moved South over time. There are subtle differences in the skull and vertebrae like it had a U shape notch between the frontal bones. The skull looks like a juvenile diplodocid. It had large eye openings and a rounded snout.

 

Kaate means small in the language of one of the tribes in Wyoming and docus eludes to Diplodocus and the greek word beam as Diplodocus is double beam but this is a small one so a small beam that's sort of cute. Other dinosaurs that lived around the same time and place as Kaatedocus include Barosaurus, Stegosaurus and Allosaurus. You can see the Kaatedocus in the sauropod exhibit on the fourth floor of the American Museum of Natural History and its fossil casts that are part of the juvenile sauropod in the Theodore Roosevelt Rotunda.

 

I have sent pictures to the palaeontologist who described Kaatedocus to get their opinion but here it is!

 

 

Kaatedocus Skull SMA 0004

 

Juvenile Diplodocus cast

 

 

 

[musicnfossils]

Wow, you have some insanely beautiful Dino teeth. Hope to add things like that to my collection someday. 

[Jaimin013]

12 hours ago, musicnfossils said:

Wow, you have some insanely beautiful Dino teeth. Hope to add things like that to my collection someday. 

Thank you! Just keep at it and ask around, build contacts etc and eventually you will!

[Tidgy's Dad]

Very nice tooth. 

Would be doubly great if it is Kaatedocus.

[Jaimin013]

12 hours ago, Tidgy's Dad said:

Very nice tooth. 

Would be doubly great if it is Kaatedocus.

Thanks a lot Adam!

[Jaimin013]

Received this Nodosauridae indet. herbivore dinosaur tooth today. The tooth is about 18.5 mm in length.

 

Unfortunately no location attached to it as it was obtained from an old collection and can't ask the original finder as they passed away - the person rarely kept location info on dinosaur fossil finds as it wasn't their main focus on collecting. @Troodon says either Edmontania or cf. Edmontania but without location info impossible to say. I don't mind though as I don't think I'll see a rooted tooth anytime soon like this. The crown of the tooth is far from perfect but it's overall a nice tooth! Edmontania would have looked something like the pic below.

 

 

 

Under magnification:

 

 

[FF7_Yuffie]

That sauropod tooth is fab.  Hope you get it confirmed as Kaatedocus , that will be a heck of a rare one. I'd never even heard of Kaatedocus

[Praefectus]

Nice nodosaurid tooth! Rooted teeth are always a treat. 

[Jaimin013]

On 05/06/2020 at 3:37 PM, FF7_Yuffie said:

That sauropod tooth is fab.  Hope you get it confirmed as Kaatedocus , that will be a heck of a rare one. I'd never even heard of Kaatedocus

Thanks Hopefully!

 

2 hours ago, Praefectus said:

Nice nodosaurid tooth! Rooted teeth are always a treat. 

Thanks very much haven't seen one in quite some time!

[Jaimin013]

Hadrosaurid tooth

Judith River Formation

Montana, USA

 

Size: 60 mm - 2 3/8"

 

The tooth was advertised as a Lambeosaurus sp. but doesn't look like one. Regardless, it's an incredible tooth which has really nice preservation. It also came with a really nice stand that looks very professional. The base is solid and really heavy to keep the fossil upright and weighted down.

 

 

 

[Jaimin013]

Theropod indet.

Portugal

Lourinhã Formation

 

I received this theropod tooth from Portugal today. It's the first tooth that I have in my collection from this country. I think the condition of the enamel and serrations are really well preserved. Hopefully from the photos you can see how smooth and well preserved the surface of the tooth is. I'm not too sure about the ID but would be cool to be able to know one day. There's just not much known from this location. It doesn't match Torvosaurus, maybe Allosaurid (but the serrations don't look like those that you typically see on Allosaurus) but if not then maybe from a Coelurosaurian theropod or from something not described.

 

You can see all of the dinosaurs from this formation by following the link here: https://en.wikipedia.org/wiki/Lourinhã_Formation

 

Length: 20 mm; Base: 9 mm length x 5 mm width

Distal serration count: 4 in 2 mm

Mesial serration count: 5 in 2 mm (Mesial serrations end about 11 mm from tip of the tooth around the curve)

 

Tooth shape

 

Closer look at serrations

 

Distal serrations

 

Mesial serrations

 

 

[fossilsonwheels]

Very nice tooth. Excellent addition 

[Jaimin013]

33 minutes ago, fossilsonwheels said:

Very nice tooth. Excellent addition 

Thanks so much!! 

[PaleoNoel]

Awesome tooth! Given the number of large carnivores in the formation (with the addition of Lusovenator), it gives you a wide variety of possibilities. But if you see coelurosaur affinities, it could be Lourinhanosaurus as it has sometimes been classified as such (with uncertain relationships).

[Jaimin013]

(Saurornitholestes?) Tooth

Pondera County, Montana

Two Medicine Formation

Size: .67" long tooth on 6.5 x 5.9" rock

 

Unfortunately there are so many potential candidates for the ID so i'll probably be changing this but have labelled it right now as the seller had it and premaxillary teeth are super difficult since most are very similar.  The only Dromaeosaurid described from the TMF is Bambiraptor but others are present.  It could also be a juvie Tyrannosaurid given how robust the face is.  I will try to take some additional closeup photos of the denticles and get a serration count of both carinae soon. The serrations look pretty well preserved on both sides so that's awesome.

 

It came with a really nice display stand.

 

[Praefectus]

31 minutes ago, Jaimin013 said:

(Saurornitholestes?) Tooth

Pondera County, Montana

Two Medicine Formation

Size: .67" long tooth on 6.5 x 5.9" rock

 

Unfortunately there are so many potential candidates for the ID so i'll probably be changing this but have labelled it right now as the seller had it and premaxillary teeth are super difficult since most are very similar.  The only Dromaeosaurid described from the TMF is Bambiraptor but others are present.  It could also be a juvie Tyrannosaurid given how robust the face is.  I will try to take some additional closeup photos of the denticles and get a serration count of both carinae soon. The serrations look pretty well preserved on both sides so that's awesome.

 

It came with a really nice display stand.

Regardless of whatever the final ID is, I think it is a nice tooth. Great addition to your collection!

[Jaimin013]

31 minutes ago, Praefectus said:

Regardless of whatever the final ID is, I think it is a nice tooth. Great addition to your collection!

Thanks alot! I'm glad that you like it!

[Troodon]

Nice tooth from Portugal. On the Premax tooth the more I look at the serrations density on your second photo they look the same.  Can you verify because if they are its a Tyrannosaurid tooth.

[Jaimin013]

Hi @Troodonregarding the premax had a quick look and over 1mm the serrations on both mesial and distal are 4. When I get proper equipment I'll take more accurate measurements but the tooth is incredibly small! Doesnt help being on the matrix but think 4 is good to go with.

[Troodon]

On the Port tooth I did a density count from your closeups and came away with 17/5mm distal and 18/4mm on mesial.  Please verify.  Can you take a photo of the base 

[Jaimin013]

18 minutes ago, Troodon said:

On the Port tooth I did a density count from your closeups and came away with 17/5mm distal and 18/4mm on mesial.  Please verify.  Can you take a photo of the base 

I'll take a count as well and will let you know.