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Showing results for tags 'transitional'.
Found 7 results
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From the album: Fossils
2.4 inch Otodus aksuaticus shark tooth from the Eocene Nanjemoy Formation of Maryland. This is a good example of the transition from obliquus to auriculatus, with serrations extending about halfway down the crown.-
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- aksuaticus
- eocene
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I'm finally getting around to posting pictures of this Moroccan shark tooth, which I believe is either a transitional Otodus obliquus or a transitional Palaeocarcharodon orientalis. My original thought was Otodus but @Al Dente flagged in the mailbox thread a few weeks ago that it might be Palaeocarcharodon instead. Any thoughts on this one? The tooth measures 49 mm on the slant and is 39 mm wide across the root.
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Recently I aquired this Carcharodon tooth from Sacaco, Peru whose serrate conditions seems a bit peculiar to me. I can't really decide whether or not this tooth is from a late-stage hubbelli or an early carcharias. The serrations seem to wear/taper off just short of the tip on one side and abruptly end near it on another, and some (although not all) of the serrations appears to be angled in a way, although I suspect some may be due to wear. My thoughts on the serrations keep seesawing in my head. Would this tooth better represent a late-stage hubbelli or a carcharias? Thanks for any and all answers. Lingual
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I was wondering what the general consensus is on what Palaeocarcharodon's ancestors are. Inwas also hoping some of you could share pics of your early or transitional palaeo teeth. cheers!
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I picked up this interesting Peruvian GW tooth. It looks like some minor damage, but upon closer inspection it appears to be part of its natural morphology. Looks like a transitional tooth, thoughts?
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One thing that it seems we do not take as seriously as we should is transitional shark teeth. Scientists have, for centuries attempted to condense specimens into individual species, calling those that do not fit in "odd" teeth and focusing on their neat little groupings. What we forget is that this only represents certain points on the graph, with an infinite amount of possible points in between each! This post was created to allow our community to commemorate and share their best transitional shark teeth specimens from any species, even if those are not confirmed. It is these seemingly extranneous teeth that hold the real answer to evolution. Show us the best transitionals and suspected transitionals you have!
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This fossil was inherited so unfortunatly I don't know the background on it. The creature within is approximatly three inches in length. It appears to have skin like an alligator with the tail of a fish, most resembling a coelocanth tail. My interest in the fossil was renewed after reading about the discovery of tiktaalik. Unlike other supposedly pre-tetrapod fishes, there is no sign of any anterior fins (besides caudal) or appendages. This has given pause to some professional paleontologists who will not even hazzard a guess as to whether what I have is, as I believe, even a vertibrate. (I can't help but wonder if it may be some sort of transitional species, possibly even one with growth stages likened to a modern amphibian.) The previous owner of this fossil was a long-time resident of Corpus Christi, Texas. He also once lived near Fayetteville Arkansas. My suspicion is that the fossil is from the Nueces River Basin. GoodLuck.
