truceburner Posted February 24, 2016 Share Posted February 24, 2016 Recently I started looking a little more closely at the small gravels in the creek. This little Ptychodus tooth, the smallest I've found to date, is the fifth I've found in Austin. I've reviewed the pinned topic on Ptychodus, but can't nail down the ID from there. What do you think? 3 Link to comment Share on other sites More sharing options...
BobWill Posted February 24, 2016 Share Posted February 24, 2016 Wow Ptruceburner, I'm not sure what to pthink That's the smallest one I've seen though it makes sense they should come that small from juveniles. I'll let someone else help with the ID just couldn't help but add to the pun. Link to comment Share on other sites More sharing options...
PFOOLEY Posted February 24, 2016 Share Posted February 24, 2016 I would lean ptowards P. Anonymus...but I have not seen mammillaris in hand. "I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?" ~Aldo Leopold (1887-1948) New Mexico Museum of Natural History Bulletins Link to comment Share on other sites More sharing options...
Ramo Posted February 24, 2016 Share Posted February 24, 2016 I think I would go with P. anonymus as well. Those dang Ptychodus are second only to Squalicorax when it comes to difficulty in separating into species. (As to the small end of the spectrum for ptychodus teeth, I have found numerous ones that are on the micro side, only a few mm wide.) Ramo 1 For one species to mourn the death of another is a new thing under the sun. -Aldo Leopold Link to comment Share on other sites More sharing options...
mechanic mike Posted February 24, 2016 Share Posted February 24, 2016 (edited) I think I would go with P. anonymus as well. Those dang Ptychodus are second only to Squalicorax when it comes to difficulty in separating into species. (As to the small end of the spectrum for ptychodus teeth, I have found numerous ones that are on the micro side, only a few mm wide.) Ramo Seems to be a lot of small ones in the green horn limestone of Kansas...I picked a lot of small ptychodus teeth out of the side of bluffs west of Pfeifer Edited February 24, 2016 by mechanic mike Link to comment Share on other sites More sharing options...
Ridgehiker Posted February 24, 2016 Share Posted February 24, 2016 Nice find. Makes me think. I also have never found a really small ptychodus tooth. Link to comment Share on other sites More sharing options...
Fruitbat Posted February 25, 2016 Share Posted February 25, 2016 Here's another ptiny Ptychodus from the Eagle Ford of Dallas Co., Texas. -Joe 1 Illigitimati non carborundum Fruitbat's PDF Library Link to comment Share on other sites More sharing options...
Coelacanth Posted February 25, 2016 Share Posted February 25, 2016 Here's another ptiny Ptychodus from the Eagle Ford of Dallas Co., Texas. I think you mean Ptexas. Link to comment Share on other sites More sharing options...
BobWill Posted February 25, 2016 Share Posted February 25, 2016 (edited) Are these pteeth asymmetrical enough to be from along the outer anterolateral or posterior rows where size is diminished? Edited February 25, 2016 by BobWill Link to comment Share on other sites More sharing options...
siteseer Posted February 25, 2016 Share Posted February 25, 2016 I think so. Are these pteeth asymmetrical enough to be from along the outer anterolateral or posterior rows where size is diminished? Link to comment Share on other sites More sharing options...
truceburner Posted February 25, 2016 Author Share Posted February 25, 2016 (edited) Thanks all. So far, P. anonymus seems most likely among the choices I've seen. BobWill - Ptentially, but I'm not certain Seems more toward the midline from my limited understanding, but I'm not familiar with the full dentition. Here's another small Ptychodus tooth from my collection: Edited February 25, 2016 by truceburner Link to comment Share on other sites More sharing options...
truceburner Posted March 9, 2016 Author Share Posted March 9, 2016 Here's another very small ptychodus tooth from the Austin area, less than a cm in any dimension. Any thoughts as to the species on this one? These can be found in the gravel bars, but not while standing, because that isn't close enough. Link to comment Share on other sites More sharing options...
LSCHNELLE Posted February 12, 2019 Share Posted February 12, 2019 Shawn Hamm did not try to ID 70 smaller rice-sized (4 to 6 mm) Ptychodus I found in a pocket in a creek in Travis County. This was due to the immaturity of the sharks. They don't develop the adult characteristics until a certain size - maybe somewhere between 8 to 12 mm or larger. These smaller ones are too hard to ID correctly. Link to comment Share on other sites More sharing options...
caldigger Posted February 12, 2019 Share Posted February 12, 2019 Here is my contribution. Came off of a matrix plate from Blue Hill Shale of Kansas. Only 3mm at its widest. Sorry, couldn't begin to ID the species. Link to comment Share on other sites More sharing options...
erose Posted February 12, 2019 Share Posted February 12, 2019 You get in the right layer and you'll find lots of them that are only a few millimeters across. Link to comment Share on other sites More sharing options...
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