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Found 12 results

  1. max pijpelink

    Chimaerid tooth from antwerp

    Hey there, I found this chimaerid tooth a couple of Months ago in sand deposits from antwerp. It is nothing like the common chimaera tooth you find there usual. It is pliocene in age and after some research it looked similar to Chimaera gosseleti, Winkler, 1880 (now Harriotta gosseleti) . But This species is found in oligocene deposits. The only recent publications about this species I could find was from this site:https://bioone.org/journals/journal-of-vertebrate-paleontology/volume-40/issue-1/02724634.2020.1772275/A-New-Genus-of-Chimaerid-Fish-Holocephali-Chimaeridae-from-the/10.1080/02724634.2020.1772275.short but I dont have the permision to enter this article, the last photo is one of this article I could enter with Google. i hope you can help me identifying this tooth! the squares are 1x1 cm gr max Pijpelink
  2. Jared C

    Ratfish (chimaera) tooth

    From the album: Texas Cenomanian (Cretaceous)

    Chimaera (Ratfish) tooth - perhaps Ischyodus sp. Cenomanian Texas
  3. Mikrogeophagus

    Ischyodus sp. Spine

    From the album: Ozan Formation

    Ischyodus sp., NSR Campanian, Cretaceous Mar, 2023 Not a common find for the NSR.
  4. Anyone know anything about Californian Helicoprion fossils? I know they’ve been found in Eastern California, but that’s about it and I’d like to learn more.
  5. Von Mayer originally described this chimaera under the name Ischyodus avitus. Elasmodectes avitus, a cartilaginous fish, is conspicuous for its sparsely ossified skeleton. There is a nuchal spine behind the head; the dorsal fin begins just behind the nuchal spine and extends to the tail. Elasmodectes seems to have possessed a skin or only very thin scales, which seems to be almost impossible to preserve. The Skull is presenting its dosal view. Reverence: WOODWARD, A.S. (1891) Catalogue of the fossil fishes in the British Museum (Natural History). Part II. containing the Elasmobranchii (Acanthodii). Holocephali, Ichthyodorulites, Ostracodermi, Dipnoi, and Teleostomi (Crossopterygii and chondrostean Actinopterygii). XLIV + 567 pp. (Taylor & Francis), London. SCHWEIZER, R. (1964) Die Elasmobranchier und Holocephalen aus den Nusplinger Plattenkalken. Palaeontographica, Abt. A, 123 (123): 58–110, 15 fig., pl. 7–12. POPOV, E.V. & DUFFIN, C. & TISCHLINGER, H. & ATUCHIN, A. (2013) Reconstructions of the German Plattenkalk (Late Jurassic) chimaeroid fishes (Holocephali, Chimaeroidei). Abstract. In: SCHWARZ, C. & KRIWET, J. (editors): 6th International Meeting on Mesozoic Fishes – Diversification and Diversity Patterns, Vienna, Austria August 4th–10th, 2013: 56 E. Popov (2014): A revision of the Late Mesozoic chimaeroid genus Elasmodectes (Holocephali, Chimaeroidei) [Poster] Conference: 74th Annual Meeting, Society of Vertebrate Paleontology, November 5-8, 2014, Berlin, Germany At: Estrel Berlin, Germany
  6. I recently found this 9mm by 7mm specimen in matrix from the Eocene Nanjemoy Formatiion of Virginia. I think it is a piece of a Chimaera tooth plate. However, in collecting the Nanjemoy Formation in Virginia for over twenty years I have never found a Chimaera tooth plate or a fragment of one. For that reason I don't want to rule out a coral fragment. However, I haven't found a piece of coral in this formation before either. For comparison, a Chimaera tooth plate (25mm by 16mm) from the Paleocene Aquia Formation of Maryland: What do you think (especially the invertebrate/coral experts)? Marco Sr.
  7. Hello there fossil forum! This post will actually contain some of my finds from 2 trips to the same location, namely the island of Bornholm in Denmark. I went there this summer, and made quite an interesting discovery, which I will get back to, and then went on yet another trip, which I got home from less than a week ago. I doubt many of you know about it, unless you're Danish or have an interest in the geology of Denmark, but most of Denmark was underwater for pretty much all of the Mesozoic era. That is, of course, with the exception of Bornholm, which is a geologist's/paleontologist's/amateur fossil collector's dream. Denmark is not well known for any dinosaur fossils whatsoever, except from a few teeth found in the Robbedale Formation, and a bunch of foot-prints scattered along the west and south-coast of Bornholm. As recent as last year in April though, someone discovered the very first dinosaur bone in Denmark, at Hasle Beach, Bornholm. It's supposedly from a young sauropod, and is still being studied at this very moment. After I heard of the discovery, I desperately wanted to go to Bornholm. So I went there for 5 days in July, and 7 days in October, where the second time, I brought some of my friends from my heavy metal band along with me. On the first trip, the very first day at Hasle Beach, I searched for about 5 hours along the beach, with not a single fossil in sight. Just as I was about to leave the beach to get something to eat, I stumbled upon a very odd looking rock. Which obviously wasn't a rock, it was a bone: It measured about 6x5x6 (LxWxH) cm. I brought this into the museum located at the island, called "Naturbornholm", which is where a lot of the fossils found on the island are showcased. I had some of the people from the museum take a look at it, and they agreed on that this was definitely bone. What was very unlikely about this bone however, is that it looks like the end of a limb-bone, meaning it probably wasn't a plesiosaur, but something that was able to walk on land. In Denmark there's a law concerning fossils, saying that if the fossil could be valuable to science, it is obliged to deliver it to the Geological Institute of Copenhagen for research. The bone is currently being examined and studied. I still haven't received any new information regarding the bone. However they have said, that there's a good chance it's probably from either a crocodile, turtle or dinosaur. Whatever the species might be, it is most likely also a new species, as most of the bone material found at Hasle are plesiosaur bones. I went digging in the exact same area for the rest of the days, in hope of finding other bone-pieces. The picture below shows other pieces I found, which according to the museum, are bone fragments. Some of them are very worn though, and covered with conglomerate and iron. They are in no way as well preserved as the slightly worn bone piece I found on the first day: Other than those, I found another piece of bone, however it is very hard to tell what it is from. I'm considering trying to open up the lump of sandstone, however the black layer of bone material is fragile. The picture quality might be bad on this one, but I can assure you, it is not coal or mineral: So after the first trip to the island of Bornholm, I was invited over there by some of the people from the museum in the autumn holiday. I brought some of my bandmates with me as well, in an attempt to up the amount of fossils we'd find. And we did find a lot of stuff. On the first day we started out slow. The guitarist from my band was the first person to find a fossil. He found a small tooth, which might be from a type of bony fish. We're currently talking with one of the paleontologists of the Geological Institute, who wants to have a look at it in person. It measures about 5 mm, and was cracked in half when found, but afterwards repaired. The second day, we went out digging up on the more northern side of Hasle Beach, where the cliff is a bit taller. We didn't find much though. The other guys went back to the hut after a few hours, and I worked my way back to the spot where I had been digging during the summer. Shortly after, I found a small fragment of bone, most likely a rib-fragment. It's probably not from a plesiosaur though, as all the plesiosaur ribs found on the beach are usually very round, and not flat. The next day, we all went to the museum, showing a few of the fossils we had found to the people we knew there. Other than that we took a look at all the awesome finds exhibited at the museum. Including 2 of the dromaeosauroides bornholmensis teeth found in the Robbedale Formation (1 of them was a replica though). Most of the dinosaur fossils found, as showcased by the museum, are trace-fossils. Dinosaur-tracks and coprolites, with the exception of the dromaeosaur teeth. However those are from the early cretaceous period (140 million years ago), while the place where we were digging, Hasle Beach (The Hasle Formation), is about 170-180 million years old. Later I went digging again the same day. Some of the others didn't feel like digging, so I went out alone. I searched in about the same area where I had found the bones last year, and got really lucky once again. First I found a nice jet-black hybodont shark tooth, measuring about 9 mm in length. Then a piece of fossil wood/branch shortly after. 2 hours after the last find, I decided to go back to the cabin we had rented not far from the beach, and once again I was super lucky, and then stumbled upon a large bone-piece! A plesiosaur paddlebone, measuring about 4x4x1 cm! The fourth day, the other guys wanted to get back in the game after showing them the paddlebone. The next day we found a couple of odd pieces, mostly shells, but also another tooth, this time it was a chimaera tooth. On the fifth day, we went to a slightly different location, about 4 km further south of Hasle Beach, at a place called "The Pyrite Lake", where there's an abundance of plant-fossils, but there has also been found a couple of plesiosaur teeth there, as well as large dinosaur tracks. These tracks, as shown at the museum, are not negatives however, but a "positive". As in, when the creature made the track, the track was filled up with mud or another sediment later, basically making a 'positive' "sculpt" of the foot so to speak. At the Pyrite Lake, we found some huge chunks of fossil wood. Some a tad too heavy to carry around in a rucksack. We did however also spot a very interesting-looking rock, that shared a big resemblance to the dinosaur-tracks at the museum. We sent the coordinates of this rock to the people at the museum, and they're gonna send a paleontologist out to take a look at it at some point, to try and determine, if it is indeed a dinosaur track. So it's going to be interesting to see, if this truly was made by a prehistoric animal, or if this is just a very funny looking rock. On the sixth, and last day of digging, we found a lot of odd looking fossils by Hasle Beach again, which we could not identify. One may have been a bigger, but crushed, hybodont tooth, trapped within a lump of sandstone. And another could be a rib or just some plant-material. Either way, we left a lot of the fossils at the museum, for them to take a look at, if any of it should hold any interest to them, or to the people of the Geological Institute of Copenhagen.
  8. sjaak

    Chimaera dental plate?

    Could this be a chimaera or rather Ischyodus dental plate? Upper Jurassic of Boulonnais, North of France.
  9. From the album: Vertebrates

    Elasmodectes avitus VON MEYER, 1862 a Rhinochimaeridae - a long-nosed chimaera Late Jurassic Tithonian Painten Bavaria Germany Elasmodectes reconstruction
  10. Anomotodon

    Chimaeras

  11. Taken from Lund, Richard, and Grogan, E.D., 2005, Bear Gulch web site, www.sju.edu/research/bear_gulch, 14/11/2016, page last updated 2/1/2006: "Heteropetalus elegantulus is an elegantly slim little euchondrocephalan with many different tooth shapes along its jaws. It ranges to only about 4 inches in length. Skull, jaws, and dentition place it close to Debeerius. It is common in the weedier shallow water areas. http://people.sju.edu/~egrogan/BearGulch/images_fish_art/Hetelegantulus_duo.jpg Male (top) and female (bottom). There are no scales, except for a small patch at the rear of the dorsal fin of males. Lateral line canals of the head are supported by rather large highly modified scales. Heteropetalus has an almost eel-like body, a protocercal tail, rounded and very flexible pectoral fins midway up the sides of the body, and a single long flexible undulatory dorsal fin (preceded by a small fin spine). All these features indicate a maneuverer in weedy or reef-like environments as well as along the bottom. Mature males have a distinctly strengthened, hooked and denticulated posterior end of the dorsal fin; the dorsal fin of males was significantly higher than that of females. This dorsal fin dimorphism is similar to that seen in the Gouramies, modern bony tropical fish available in any pet store. http://people.sju.edu/~egrogan/BearGulch/fossils_fish/Helegantulus_head_640.jpg Dorsal view of Heteropetalus elegantulus head They have a very small mouth, with the teeth crowded to the front of the jaws, and a variety of plucking, nipping, and crunching teeth. The jaw suspension itself is rather flexible to give it a certain amount of both lateral and fore-and-aft motion. The bright yellow spots in the dorsal view of a head are the inner ears, and the yellow is from iron oxide particles that were bio-concentrated during the life of this fish. H. elegantulus was originally described as a petalodont, but subsequent discoveries proved it to be otherwise; it is closely related to Debeerius ellefseni." Lit.: Lund, R. 1977 - A new petalodont (Chondrichthyes, Bradyodonti) from the Upper Mississippian of Montana. Annals of Carnegie Museum, 46 (19): 129-155. Grogan E.D. & Lund, R. (2000): Debeerius ellefseni (Fam. Nov., Gen. Nov., Spec. Nov.), an autodiastylic chondrichthyan from the Mississippian Bear Gulch Limestone of Montana (USA), the relationships of the Chondrichthyes, and comments on gnathostome evolution. Journal of Morphology, 243 (3): 219-245.
  12. A modern Ratfish, Bischoff Island, British Columbia, Canada (from Wikipedia: Clark Anderson/Aquaimages) Lit.: Grogan, E. Lund, R. 2002: The geological and biological environment of the Bear Gulch Limestone (Mississippian of Montana, USA) and a model for its deposition. Geodiversitas 2002, 24 (2): 296-315 Lund, R. 1977 - Echinochimaera meltoni new genus and species (Chimaeriformes), from the Mississippian of Montana. Annals of Carnegie Museum, 46 (13): 195-221. Hagadorn, J.: Bear Gulch: An exceptional Upper Carboniferous Plattenkalk
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