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Found 17 results

  1. izak_

    Placoderm Trip

    A few weeks ago some friends and I visited a site near Braidwood in southern NSW (3 hours south of Sydney) for middle-late Devonian fish. The site was first published in Ritchie (1984) with the description of Placolepis budawangensis, a phyllolepid known only from this locality. This species is one of the two most common here, with the other being Bothriolepis longi (see Johanson 1999). So far, only these two species have been described from this locality but acanthodian spines and sarcopterygian scales are also known. All fish fossils from this locality occur in within a 75cm band of red siltsone and are mostly just disarticulated plates, but the P. budawangensis holotype is still fairly well articulated. The plates of both species are very recognisable, the Placolepis usually have lovely parallel ridges whereas the Bothriolepis are covered in tiny bumps. Some photos of the siltsone band with some fish plates exposed on top. Peter did a great job on this hole, it's not easy work! The specimens from this locality are quite weathered, so the bone is usually quite poor and doesn't split well. They still look nice, but I chose to dissolve away the bone in hydrochloric acid to latex the cavity for photography. Here are some as found: Placolepis: Bothriolepis: Some bone in cross section (the horizontal black dotted lines): Here are some latex casts of specimens after acid preparation. The latex is blackened with ink, then whitened with ammonium chloride for high contrast photos. Much easier to make out features in these than the unprepared specimens! Bothriolepis longi plates and pectoral fins (compare with figures in Johanson 1999): Placolepis budawangensis: Sarcopterygian scale(?): No idea on this one! After the fish site, we quickly stopped in at a road cutting which yields occasional Devonian plant fossils. Nothing too exciting, but still nice to find some Devonian plants! That's all for now, I might post more ammonium chloride photos when I take the next batch. Hope you enjoyed!
  2. SharkySarah

    Devonian fish finds

    Looking for some experts on these attached images. These are just ones I can’t figure out. Scale in metric. I had a successful hunt at the end of 2023. Soon I’ll be adding a photo album of this and some of my other finds from various locations. Overall, I found Ageleodus pectinatus teeth, Hyneria lindae teeth and scales, Megalichthys mullisoni scales, Langlieria radiatus scales, Holoptychius sp. scale, acanthodian fish spine, Phyllolepis rossimontina armor, Turrisaspis elektor armor, and plant leaves and stems. EDIT: Location - Clinton County, PA.
  3. Ammonit

    Bothriolepis

    It was received by exchange. Place of finding: Leningrad region
  4. This is the prep I just finished of Bothriolepis canadensis (Placodermi; Upper Devonian). The concretion was collected in 1966 and never prepped. Because there was not much surrounding matrix, I prepped the whole thing (dorsal and ventral surfaces). I made a formed cradle out of paleosculp for prep and for storage, as the skull is compressed and potentially susceptible to breakage while handling. This is how the concretion looked prior to prep (left is dorsal, right is ventral): I started prepping the ventral side first (I didn't know when I started which side was which). Here is a series of photos showing the prep of the ventral side: Here is a series of photos showing the prep of the dorsal side. A portion of the left pectoral fin, complete with marginal spines, is present. The anterior part of the orbital is intact. I think the large raised piece toward the rear of the skull is the nucal plate that has been dislodged. If one were to spin that around and place it towards the front of the skull, it would make up the posterior of the orbital. I think the mouth opening is also intact on the ventral side. Here is a composite photo showing before and after prep of both sides.
  5. Fossildude19

    Bothriolepis body cast double

    From the album: Fossildude's Upper Devonian Fish Fossils

    Bothriolepis sp. body casts Upper Devonian Catskill Formation Metzgers' Quarry, Canton, PA.

    © 2022 Tim Jones

  6. Misha

    Bothriolepis sp.

    From the album: Misha's Late Devonian Fossils

    My most complete Bothriolepis fossil from the Catskill Fm. This preserves much of the head of the small fish. Late Devonian, Catskill Fm., PA.
  7. Fossildude19

    Bothriolepis shield and pectoral spines

    From the album: Fossildude's Upper Devonian Fish Fossils

    Bothriolepis sp. body armor and pectoral fin spines Upper Devonian Catskill Formation Metzgers' Quarry, Canton, PA.

    © 2022 Tim Jones

  8. Fossildude19

    Bothriolepis body cast

    From the album: Fossildude's Upper Devonian Fish Fossils

    Bothriolepis sp. body cast Upper Devonian, Catskill Formation Metzgers' Quarry, Canton, PA.

    © 2022 Tim Jones

  9. Fossildude19

    Baby Bothriolepis fin spine

    From the album: Fossildude's Upper Devonian Fish Fossils

    Bothriolepis fin spine - close up. Upper Devonian Catskill Formation Upper Steam Valley Route 15 Road cut. Pennsylvania

    © 2022 T. Jones

  10. Misha

    Bothriolepis flipper 2

    From the album: Misha's Late Devonian Fossils

    My second Bothriolepis sp. flipper partial. This one is smaller but also nicely preserved. Found at the same roadcut Late Devonian, Catskill Fm., PA.
  11. Misha

    Bothriolepis flipper

    From the album: Misha's Late Devonian Fossils

    Plate of small mixed fish bits from the late Devonian with a difficult to see but large piece of Bothriolepis sp. flipper in the middle of the block. Rte 15, Late Devonian, Catskill Fm., PA.
  12. Bringing Fossils to Life

    Hyneria scale or Bothriolepis plate?

    Hey everyone! I'm not the best with fossil fish; I need some help with ID. My friend told me this was a Bothriolepis plate, but I second guessed when I saw the frilling on the edge, as well as the overall shape. I know there are many fossil fish experts here...does anyone know what it is?
  13. Fossildude19

    Unidentified Sarcopterygian? skull plate.

    From the album: Fossildude's Upper Devonian Fish Fossils

    I believe this is a partial skull plate of an unidentified sarcopterygian fish. Upper Devonian, Catskill Fm. There is a chance that it is actually a Bothriolepis skull plate.

    © 2021 Tim Jones

  14. Fossildude19

    Bothriolepis hash plate

    From the album: Fossildude's Upper Devonian Fish Fossils

    Bits of Bothriolepis sp. Catskill Formation, Upper Devonian. Metzgers' Quarry, Canton, PA.

    © 2021 Tim Jones

  15. Fossildude19

    Bothriolepis partial head shield

    From the album: Fossildude's Upper Devonian Fish Fossils

    Metzgers' Quarry, Canton, PA. Bothriolepis sp. head shield partial Catskill Formation

    © 2021 T. Jones

  16. oilshale

    Bothriolepis canadensis Whiteaves 1880

    Bothriolepis ("pitted scale" or "trench scale") was the most successful genus of antiarch placoderms with over 100 species found on every continent, including Antarctica . The extinct armored fishes known as placoderms make up what is considered to be the earliest branch of the gnathostome family tree -- the earliest branch of the jawed fishes. Antiarchs are characterized by the fact that their pectoral fins are enclosed in bony tubes (pectoral appendages). Instead of typical fish-like pectoral fins, it bears a pair of rigid arms that are joined at two points. These arms, like the limbs of an arthropod, are articulated by interior muscles. Bothriolepis is a placoderm with a heavily armoured head fused with the thoracic shield. The body was encased in a bony box that had flat sides and bottom and an angled roof. There are two openings through its solidly armoured head -- a keyhole opening along the midline on the upper side for both eyes and nostrils and a mouth on the lower side near the front. The discovey of some undeformed, three-dimensionally preserved specimens led to a review of this fish's morphology. It appears that Bothriolepis had a much more rounded shape than previously thought, and as a direct consequence of the latest reconstructions, it is now believed that its eyes faced forward instead of upward. Bothriolepis does have a slender fish-like tail that extends behind the heavily armored portion but, because it is almost naked with few scales, it is rarely preserved. Placoderms bore heavy bony armor on the head and neck; in the past it has been suspected that there is an unusual joint in the dorsal armor between the head and neck regions; this joint apparently allowed the head to move upwards as the jaw dropped downwards, creating a larger gape. But one of the new discoveries shows there is no indication of mobility between the cephalic and thoracic armors. Bothriolepis had a peculiar spiral, sediment-filled gut and probably grubbed in the mud. It may also have used its pectoral fins to throw sediment (mud, sand or otherwise) over itself. Bothriolepis probably fed on invertebrates such as crustaceans and molluscs or even was a mud-grubber that ingested organic-rich mud for its food. Bothriolepis is the most common fish fossil in the shales and sandstones of the Escuminac Formation (Late Devonian, 380 Ma) on the south shore of the Gaspé Peninsula at Miguasha. Abraham Gesner (1797-1864), the provincial geologist of New Brunswick who discovered the site in 1842, referred to this fossil as "a small species of tortoise with foot-marks". It seems to be certain that there are at least two, with the second species discovered and described in 1924. Named B. traquairi (after the Scottish paleontologist Ramsey Heatly Traquair) the one and only specimen officially assigned to this species has a more slender body than B. canadensis. Because the fossils are found in freshwater sediments, Bothriolepis was originally presumed to have spent most of its life in freshwater rivers and lakes. This idea is now abandoned; many paleontologists now hypothesize that they lived most of their lives in saltwater, and returned to freshwater only to breed. References: Thomson, K. S., & Thomas, B. (2001) On the Status of Species of Bothriolepis (Placodermi, Antiarchi) in North America. Journal of Vertebrate Paleontology, 21(4), 679–686. http://www.jstor.org/stable/20062008. Béchard, I., Arsenault, F., Cloutier, R., & Kerr, J. (2014) The Devonian placoderm fish Bothriolepis canadensis revisited with three-dimensional digital imagery. Palaeontologia Electronica, 17(1):1-19.
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