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Showing results for tags 'Albian'.
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I have come across another small bird fossil and am unsure what bone it actually is. this was found in the toolebuc formation in central Queensland Australia near Richmond. This makes it about 98 to 100 million years old. The bone at longest length is 17 mm so still quite small. Thanks for any input in advance. Mike D'Arcy
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Found this tooth at Waco site. Del Rio formation, Albian.
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From the album: Albian vertebrates of Ukraine
Elasmosaurid (?) tooth -
Here are several teeth from Late Albian of Ukraine (Kanev region). Help with identification will be very appreciated. Other fossils from this site 1. Tooth is fairly worn, but it should preserve the original shape (no cusplets). Root is poorly preserved, but is it possible to determine who it came from? I am thinking about an early Anacoracid or a Carcharhiniform (Triakidae)? By the way, Anacoracids are extremely rare there, so there is really nothing for comparison. 2. Most likely a tiny Synechodus crown, but the shape looks weird for Synechodus. Could it be a Scyliorhinid? 3. Anacoracid? It has some serrations on the distal side. Also thought about Squaliform, but the root looks more lamnoid-like. 4. Scyliorhinid or Lamnoid?? 5. Almost 100% sure it is a Hemiscylliidae, but is it possible to determine the genus? I am leaning towards Chilloscyllium, but not sure.
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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. ‘Heterodontus’ upnikensis 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.
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- albian
- heterodontus
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From the album: Albian vertebrates of Ukraine
Size 2 cm. -
From the album: Albian vertebrates of Ukraine
A - posterior B - lateral -
From the album: Albian vertebrates of Ukraine
Unusually large Synechodus tooth -
From the album: Albian vertebrates of Ukraine
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From the album: Albian vertebrates of Ukraine
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From the album: Albian vertebrates of Ukraine
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From the album: Albian vertebrates of Ukraine
Premaxillas of Aspidorhynchid jaw, possibly Belonostomus. -
From the album: Albian vertebrates of Ukraine
Unfortunately, Paraisurus teeth preserve very poorly. -
From the album: Albian vertebrates of Ukraine
D. woodwardi anterior. You can see a notch between lateral cusplet and the main crown typical of this species. -
From the album: Albian vertebrates of Ukraine
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From the album: Albian vertebrates of Ukraine
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From the album: Albian vertebrates of Ukraine
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From the album: Albian vertebrates of Ukraine
Various Cretoxyrhina vraconensis teeth -
From the album: Albian vertebrates of Ukraine
Three Cretoxyrhina vraconensis teeth - A - posterior B - lower lateral C- symphyseal (might also be Dwardius) -
From the album: Albian vertebrates of Ukraine
Various Ischyodus chimera dental plate fragments. -
From the album: Albian vertebrates of Ukraine
Strangely shaped bone. Typical porous structure is seen on the picture. -
From the album: Albian vertebrates of Ukraine
A. haigi with pathologicaly deformed crown - it is strongly curved labialy. -
From the album: Albian vertebrates of Ukraine
Various Archaeolamna haigi teeth. A - anterior B - symphyseal C, D - upper and lower laterals respectively, both have one weird denticles on both mesial and distal sides E - weird morphotype with large robust cusplets, looks like 'Cretalamna' F - posterior -
From the album: Albian vertebrates of Ukraine
A - lateral of H. upnikensis B, C, D - anteriors. They are characterized by absence of cusplets, compared to contemporary H. canaliculatus. -
From the album: Albian vertebrates of Ukraine
Partial ichthyosaur tooth, supposedly Platypterygius (however now it is a wastebasket taxon)
