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Showing results for tags 'isurus'.
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From the album: Pleistocene and Miocene fossils
A 3.7 cm long Isurus Oxynchus from Hoevenen near Antwerp. -
From the album: Pleistocene and Miocene fossils
A beautiful 3.5 cm long Isurus desori from Hoevenen near Antwerp. -
From the album: Pisces
23mm. Shortfin Mako upper. From the Miocene at Calvert Cliffs, MD. Recieved on a trade with Fossil Hound. -
From the album: Pisces
23mm. Shortfin Mako lower. From the Miocene at Calvert Cliffs, MD. Recieved on a trade with Fossil Hound. -
Hey all, I have a tooth here, and I'm a bit confused. It comes from Hoevenen (BE), and dates from the Miocene. I'm pretty sure that it's a mako tooth, but I'm not sure what species: Isurus hastalis or Isurus oxirhynchus? Or perhaps another one? Also, how exactly can you distinguish I. hastalis from I. oxirhynchus? Best regards and have a nice Sunday! Max
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This shark tooth was found on the foreshore at Beaumaris in Victoria, Australia. It is 5-6 million years old. I am confident it is a mako shark tooth but i am trying to decide which species to label it. The following shark taxa are listed in the fauna found at this location: Heterodontus cainozoicus, Carcharias taurus, Carcharodon megalodon, Parotodus benedeni, Isurus desori, Isurus oxyrinchus, Isurus hastalis, Isurus retroflexus, Lamna?, Megascyliorhinus sp., Carcharhinus cf. brachyurus, Carcharhinus sp., Galeocerdo aduncus The majority of teeth at the site are from Carcharodon hastalis (or Isurus hastalis depending on who you believe). However i feel like my tooth is too narrow to be a C. hastalis tooth. Even the first lower anteriors of C. hastalis that i have seen are somewhat proportionally wider than my example, hence why i am leaning towards one of the other species of mako but i want to know what the shark tooth experts on this forum think. I had a look in the book 'Vertebrate Palaeontology of Australasia' (which has a nice section on fossil chondrichthyans) and the closest match i could see was a first lower anterior tooth from Isurus paucus (tooth A on page 552 if anyone has the book) but this species isn't listed in the fauna for Beaumaris. Might it instead be an Isurus oxyrinchus or desori tooth? Additionally my tooth is fairly straight, and most of the other mako specimens i am seeing are more curved. It measures 24 mm long and 11 mm wide.
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This shark tooth was found deep in a cave on an island which is off the Panamanian coast (Atlantic side). It appears to be a fossilized mako shark tooth; however, I haven't been able to identify the exact Isurus species. It doesn't appear to be either of the currently living mako shark species, Isurus Oxyrinchus or Isurus Paucus. That leaves eleven other extinct species. Any help would be very appreciated!
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Field collected in 2012.
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Self Collected in the Lee Creel Mine during my very first trip into it.
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A great friend and fellow collector asked me to commemorate her first large find in the form of a personal illustration (a tattoo). I was more than happy to oblige given that 1) it's my job and 2) we were both REALLY excited about her find. For those of you that do not like tattoos, my apologies. Please just think of it as an illustration carried about by an art collector.
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I have had this tooth for a while and i cannot positively place it as any species. Similar to I. Desori but it is so thick and heavy especially in the root that it defies reason. Also the shape of the roots does not look like any other desori i have ever seen. Is it just an unusually thick-rooted desori?
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From the album: Chesapeake Western Shore - Miocene
- At top and top left, extinct mako shark teeth - At right and upper right, upper and lower Hemipristis serra (snaggletooth shark) teeth - At left and center-left, sand tiger shark teeth - At bottom and bottom-left, ray dental crushing plates - At lower right, fish (sturgeon?) dermal scute© rpw/sew 2013
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