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Found 22 results

  1. Hello everyone, it's been a while since I last posted on the forum In the last year my collection has reached 33 specimens, so I guess that "road to 35" is extremely close! Today I wanted to show you a specimen I acquired very recently, specifically last March! Species: Cretalamna maroccana (Arambourg, 1935) Size: 2.5 tall, ~3.0 cm long Age: 72-66 mya (Late Cretaceous, Maastrichtian) Origin: Ouled Abdoun basin (Morocco) About this fossil: a nicely preserverd shark tooth, with only a small hole on the front part of the tooth's root; I especially appreciate the two lateral cusplets, which are extremely nice to admire. Definitely one of my favorites!
  2. I am really excited about a project we have been working on. We decided to switch our shark displays from the ones based on Geological era to a taxonomic display style. We had been considering this since we made a similar switch with our dinosaurs. It has made those programs flow more easily and i think allowed the kids to get a better understanding of the animals. We originally set our displays up as they were because we simply did not have enough material to do taxonomic displays. There were a few orders of sharks for which we had only one or two fossils and one extinct order for which we had zero fossils. Doing the displays along a timeline allowed us to cover up the holes in the collection. We have made a lot of improvements to our shark collection in the last year and were strongly considering changing things. A conversation with @siteseer really sealed the deal. Jess nudged me over the ledge lol So work has begun on this project and I am loving it but it is a lot of work. Each order of shark, extant and extinct, will eventually have it's own display. Within the the display, each family or in some cases genus, will be set up by temporal range. I think these displays will not only allow more efficient presentations but will also show temporal range and distribution as best we can. Step 1 was identifying which orders, families, and genera we need to add to the collection in order to round out what we already had. Some orders needed little attention but there were some that needed a bit of a boost. Heterodontiformes was an example of one that needed to a boost. We had Jurassic teeth (Paracestracion and Heterodontus) but little else. Having the Jurassic teeth is awesome because it shows how far back they go in the fossils record but that would be an underwhelming display visually and not give the kids a great sense of the sharks. We had to find fossils to place them at various points in their temporal range and widen their distribution to the best of our ability. Pristiophoriformes was another that we needed to upgrade as we only had one small rostal tooth. We had a good variety of material for most extinct orders but wanted a Carboniferous Xencanthid tooth to better tell the whole story of the Eel sharks as all of ours were Permian. We picked through micro fossils to add Devonian Ctenacanthiformes teeth to expand the temporal range and add diversity in the form of Phoebodus. Step 2 is on going and is probably the hardest part, acquiring the fossils we need. It is quite easy to find some of the things we needed. Others have been extremely difficult and a few are pretty much impossible. We are unlikely to knock Hemiscyllium or Oxynotus off the list. It proved very difficult, but not impossible, to locate a Cenozoic Chiloscyllium tooth. We had Cretaceous teeth but nothing beyond that and Bamboo Sharks are one that we do talk about quite a bit. After a lengthy search, we finally tracked one down and it was quite inexpensive. Cost is always a factor for us so early on we understood we were not going to be adding some collector type teeth like a 2" Chilean White Shark or the transitional White Shark teeth. We focused instead in smaller teeth and anything that added a new shark, contributed to showing distribution or temporal range. For us a STH Scyliorhinus is a significant fossils because it adds to both distribution and temporal range of a shark we talk about. I am very proud of some of the inexpensive teeth we have found including a Chilean Angelshark, a Miocene Mitsukurina, the Paleocene Chiloscyllium, and a Heterodontus fin spine from STH. We have also been greatly aided in our quest by a couple of donations, including one from @Troodon that included very important Eocene Orectolobiformes teeth and a super Megachasma from Chile. I want to credit @siteseer too though I am not sure what he is sending but I know it help tremendously lol Step 3 was figuring out how many display cases we would need and what sizes we would need. We knew that in addition to the displays by order, some sharks would get their own displays. For example, we have a lot of Lamniformes that we cover during our presentations but Goblin Sharks get special attention because kids really love them so they would get a separate display. The displays will not be of uniform size as some orders will be better represented. There will be more Carcharhiniformes than other orders for example. Size of the shark and size of the fossils also contribute to the need for a variation in display size. Step 4 is dismantling the old displays and putting together the new ones. This is on going and will not be finished until mid March probably. We need new labels which is taking a bit of time as there is a lot of shark fossils going into these displays. Step 5 will be displays of shark relatives. I think we will have one small one that will feature the three Stethacanthids we have, one small display for the two Eugenodontids and then another larger one to house the Batoids. We do cover shark relatives and they are quite popular with the students so these are important to the programs too. Kids love these wierdo creatues lol One of the really cool parts of this project is it allows me to think as an educator but also very much as a collector. I am an educator first and these fossils are for educational purposes but I consider myself a collector of shark fossils too. Doing this does allow me to add things that have educational value but also cross things off the personal list of sharks I want in the collection, like Megachasma and Mitsukurina. I can also view the collection and see areas where we can improve the quality of teeth at some point down the road. White Sharks and Cow sharks in particular will get an upgrade at some point. We can hunt for some of the rare Squaliformes teeth. Maybe we will track down a Ctenacanthus fin spine. Our goal is not just to tell the story of sharks but to show the story of sharks through the fossils. The people who invite us to present our fossils not only get to handle Megalodon teeth but they get close up examinations of a 300 million year old egg case, a Hybodus fin spine, shark vertebra and can compare the difference between Sawshark rostal teeth and Sawfish rostal teeth in their hands. I am quite proud of the hands-on education we give people and I think this project improves the overall impact. This project has also given us far more scientific knowledge and a far better understanding of shark classification. The learning has been invaluable really. Carter and I are both very passionate about sharks as we are with all of our programs but sharks have a special place. When he was a little guy, we would watch shark documentaries and this is an extension of that father son time for us. We knew this would require spending more money and take some time to do but we know it will be worth it. This will be a shark education program that will educate elementary students, museum patrons, college students and senior citizens. That is pretty darn cool I think. We also want to thank all of the forum members who contributed shark fossils and knowledge over the last year. This, like our other programs, would not be possible without the support, encouragement and generosity of TFF members. I apologize for the length of this post lol I have been really busy and have not been able to take the time to post about this and am pretty excited hence the rambling nature. I will post some pictures as we go through this and complete these. Pic 1 one of the boxes of shark fossils currently laying around our house lol It is a small box but there is quite a lot stored in there, just waiting for their permanent home.
  3. Mikrogeophagus

    Striatolamia macrota

    From the album: Eocene

    Striatolamia macrota, Burleson Co. Lutetian, Eocene May, 2023 Took one last trip to the bridge on the way to help my brother move out of his dorm. It was raining hard the whole way there, but the rain stopped as I got to the spot. Super muddy, but worthwhile to find some shark teeth freshly eroding out for this quick visit. This is my best example of Striatolamia macrota.
  4. siteseer

    Parotodus?

    Here's an odd one. I think it's a Parotodus that might be the species, P. oligocaenus, which I have read is valid - something to talk to David Ward about. I bought this around the mid-90's as part of a small lot of teeth from the Suwannee River, Florida. I wasn't sure what it was at the time and Parotodus wasn't an in-demand genus like it is now. The dealer thought this and the other teeth washed out of the Ocala Limestone (Late Eocene). I lost track of this tooth and thought I might've traded it somewhere down the line but found it with another tooth from the same site in a zip-lock in a different box. It measures just over 1 1/8 inches. It looks like some Oligocene Parotodus I've seen. @fossilselachian @MarcoSr @isurus90064 @sixgill pete @Al Dente @sagacious @Northern Sharks
  5. siteseer

    Squalicorax review

    This thread was inspired by Sander's excellent review of his collection of Squalicorax teeth. I have started getting some of my Squalicorax specimens together and a few have been photographed already to provide additional visual references for collectors. I will try to show teeth chronologically (Albian teeth first, then Cenomanian...) from early in the evolution of the genus and on to the time of its last representatives. I start with the two oldest Squalicorax teeth in my collection - a pair of specimens from the Upper Albian-age Pawpaw Formation, Motorola site, Tarrant County, Texas. The first tooth is S. pawpawensis (10mm along the mesial edge) and the second is S. priscoserratus (just over 10mm along the mesial edge).
  6. Marco90

    Cretalamna

    From the album: My collection in progress

    Cretalamna biauriculata Wanner 1902 Location: Morocco Age: 72-66 Mya (Maastrichtian, Upper Cretaceous) Measurements: 1,8x2,8 cm Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Class: Chondrichthyes Subclass: Elasmobranchi Superorder: Selachimorpha Order: Lamniformes Family: Otodontidae
  7. Marco90

    Striatolamia macrota

    From the album: My collection in progress

    Striatolamia macrota Agassiz 1843 Location: Morocco Age: 56-48 Mya (Ypresian, Eocene, Paleogene) Measurements: 1,8x2,8 cm Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Class: Chondrichthyes Subclass: Elasmobranchi Superorder: Selachimorpha Order: Lamniformes Family: Odontaspididae
  8. Marco90

    Squalicorax pristodontus

    From the album: My collection in progress

    Squalicorax pristodontus Agassiz 1843 Location: Morocco Age: 72-66 Mya (Maastrichtian, Upper Cretaceous) Measurements: 2,5x1,5 cm Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Class: Chondrichthyes Subclass: Elasmobranchi Superorder: Selachimorpha Order: Lamniformes Family: Anacoracidae
  9. I could use a little help identifying a few teeth from the Lake Waco Formation. That’s the geological info I was given at least. I’m not familiar with the formation so I’m not sure of the age. First up, 2 small Ptychodus teeth. Both around 7mm. Very low crown. I’m not great with Ptychodus ID’s so I could be way off but I think these could be P. rhombodus based on some pictures I’ve seen. I don’t have any other Ptychodus teeth that look quite like this.
  10. readinghiker

    Unknown lamniform

    Hello all! I have around a dozen of these teeth. (Found in New Mexico. Coniacian.) The very prominent lingual protuberance should be diagnostic, but I can't find a match. Eostriatolamia tenuiplicatus looks good, but the crown has striations, and these don't. Archaeolamna kopingensis also looked good, but the secondary cusps of this species are oriented away from the main cusp. Leptostyrax macrorhiza also has labial striations. The narrowness of the cusps and crown also has me baffled. Any ideas?
  11. fossilsonwheels

    STH Micros in need of ID help

    I am fairly comfortable with the STH micros as far as identification goes but I found a few things that I need some help with. First up is one that I am 90% sure on the ID but I want to be sure. I believe I found a couple of Raja teeth. The first one I found looks to be complete and tiny, a little over 1mm. I know skate teeth are somewhat uncommon in this fauna and this would be my first one.
  12. I have a few unknowns from the Cenomanian of Russia that I am starting to get around to photographing and identifying. I am practicing with my actual camera instead of my phone so the pics are just ok but will get better lol The first one is from near Fedoravka Tambov Region of Russia. This one is about 13 mm or so. I think the ID when purchased was Cretoxyrhina but I do not know how accurate that is. I thought perhaps Cretalamna or maybe Dwardius or something completely different. I just do not know. It is a really striking tooth though and I would like to get some idea of what it is.
  13. This tooth was originally labelled as an Cardabiodon sp., but both dimensions and general crown's features led me to buy it due to curiosity (also was really cheap). The crown is higher than the root. The cutting edges bear no serrations. There're traces of secondary lateral cusplets. The lingual face of the root seems to have a rounded lingual foramen on the enlarged torus. The tooth, probably a lamniform, was collected near Fedorovka village, Tambov region, Russia and goes back to the Cenonian epoch (Cretaceous). Any guess?
  14. fossilsonwheels

    Cardabiodontid or something else ?

    I saw this Cretaceous Lamniformes tooth pop up on the auction site that shall not be named and grabbed it. It was inexpensive so it is not really much of a gamble. It was sold as Cardabiodon sp. It comes from the Cenomanian of Russia, Fedorovka Village, Tambov region. That is all the geological information i could get. I have not really studied up on Cardabiodontid teeth very much as I planned on getting one down the road. I did take a look at some papers on Cardabiodon and Dwardius yesterday, I also looked around for photos to compare with the pictures we were given of the tooth. The scale in the photos is cm. These are the only photos I have until the tooth arrives. I am far from an expert, closer to novice lol I think it MIGHT be a Dwardius tooth but that is really an uneducated guess based on limited research. I thought I would post it here and get some opinions from the knowledgeable folks here.
  15. Just thought I'd share this post from our Facebook Group. Had a blast sharing some of my shark fossils with visitors this last Saturday. If you can contribute and give back to your community and society in general I promise that you'll find the experience rewarding and enriching. Pass on your knowledge to the next generation and get them exited about the sciences and paleontology.
  16. After the Hybodontids, our program starts to transition toward the modern sharks. We introduce lamniform sharks and the cow sharks. We will not be able to spend much time at all on the Cow and Crow Sharks. They only get a brief introduction and a look at the teeth. Squalicorax is an important species for us even though we do not spend a lot of time on it. The students in first few classes we do presentations for will be going home with Squalicorax teeth from Morocco. We would like to spend more time on the Cow sharks eventually but we only have one tooth to show them and we will have to edit content to free up space for them but I will work on that down the road. The primary focus in this section is Scapanorhynchus. The first shark art Carter did was a Goblin and we do give them a lot of time in the presentaton. They look cool and have been around for a long time. We present the kids with a nice assortment of teeth and some cool science. The teeth were important adaptations for catching fish and the snout had the ampullae of Lorenzini for sensing changes in the electro magnetic fields around them. We compare this to the modern hammerhead which we do not cover in the program but gives the kids a sense of how the adaptations of hammerheads work. We also talk about fin structure and being able to tell they were slow swimmers. The extend-o-matic jaw is another adaptation we cover with this species. I am happy with the fossil representations for now though I really want to add more Cow Shark fossils at some point and Anomotodon would also be a good addition. The fossils for the presentation.. Pic 1 Hexanchus andersoni from STH. I know H. andersoni should chronologically fit later but Cow Sharks fit here and this is the only one we have for now. Pic 2- Squalicorax pristodontus from Morocco. This is our largest Squalicorax tooth. The kids will get these teeth to take home so while we do not spend a lot of time on them, the teeth are very important to the program. Pic 3- Scapnorhynchus texanus and Scapanorhynchus puercoensis. Our nice little Goblin Shark display with some of our best teeth. Two of the texanus teeth are over 1.5 inches and the puercoenisis teeth are uncommon I believe and pretty super cool.
  17. I am not sure what species this Cretaceous shark tooth belonged to. It comes from Kansas but I really do not have much more information. It is 2 cm on the slant. It is really a nice tooth and it was a bargain. My best guess is Archeolamna which I believe is found in the chalk in Kansas. I do not think it is robust enough to be Cardabiodon and I do not know what other species it would match from the area. Any help would be appreciated.
  18. Fossil-Hound

    Otodus obliquus

    Three specimens acquired from a trade with @gavialboy Specimens are from an undisclosed location within the Aquia Formation linked to Purse State Park.
  19. From Wikipedia: "Members of the order are distinguished by possessing two dorsal fins, an anal fin, five gill slits, eyes without nicititating membranes, and a mouth extending behind the eyes. Also, unlike other sharks, they maintain a higher body temperature than the surrounding water". References: DETLEV THIES & ARMIN LEIDNER (2011) Sharks and guitarfishes (Elasmobranchii) from the Late Jurassic of Europe. Palaeodiversity 4: 63–184; Stuttgart, 30 December 2011. (version with low resolution, but still 16MB to download)
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