Pristiformes Posted July 1, 2009 Share Posted July 1, 2009 Okay, I have no idea what species these things came from. I think Del mentioned what species they came from but I forgot since I arrived back from Alabama. The rostral frags in the photo come from the Tallahatta Formation (early to mid-Eocene) in SW Alabama (near the Town of Andalusia). The longest one measures around 2 inches. Looking at a book by G. Case (Pictorial Guide to Fossils), he shows a figure of what he's calling Cylindracanthus acus from the Eocene of Georgia, which I believe currently resides in the swordfish family Xiphiidae. The figure looks very similar to these specimens. Any ideas? Link to comment Share on other sites More sharing options...
Pristiformes Posted July 1, 2009 Author Share Posted July 1, 2009 Hybodus just alerted me to their identity (Cylindracanthus acus). I still wouldn't mind any additional comments on these. Link to comment Share on other sites More sharing options...
Xiphactinus Posted July 1, 2009 Share Posted July 1, 2009 Anyone have an idea of what this fish looked like? I've collected some of these from Point A as well. They are so small...I'm having trouble envisioning the entire fish. Link to comment Share on other sites More sharing options...
mommabetts Posted July 1, 2009 Share Posted July 1, 2009 Nice finds Link to comment Share on other sites More sharing options...
Coco Posted July 1, 2009 Share Posted July 1, 2009 I don't think it is rostral frags. Perhaps Hybodus, and if it is really this species, it is a "dorsal prickle". Here is one of Hybodus : http://www.buriedtreasurefossils.com/image...ks6/M1185-P.jpg And here a Jurassic Hybodus : http://www.elasmo-research.org/education/e...age/hybodus.gif You can see the prickles on the dorsal fins. Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Pareidolia : here Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
Harry Pristis Posted July 1, 2009 Share Posted July 1, 2009 Hybodus just alerted me to their identity (Cylindracanthus acus). I still wouldn't mind any additional comments on these. These rostral fragments are fairly common fossils in the Late Eocene Ocala Group Limestone. I've never found a complete example, though there is one illustrated in Hulbert's THE FOSSIL VERTEBRATES OF FLORIDA. http://pristis.wix.com/the-demijohn-page What seest thou else In the dark backward and abysm of time? ---Shakespeare, The Tempest Link to comment Share on other sites More sharing options...
Pristiformes Posted July 1, 2009 Author Share Posted July 1, 2009 I don't think it is rostral frags. Perhaps Hybodus, and if it is really this species, it is a "dorsal prickle". Here is one of Hybodus : http://www.buriedtreasurefossils.com/image...ks6/M1185-P.jpg And here a Jurassic Hybodus : http://www.elasmo-research.org/education/e...age/hybodus.gif You can see the prickles on the dorsal fins. Coco Coco, I'm not sure these are dorsal spines from Hybodus. The Point A Dam specimens are completely cylindrical and have only the slightest taper to them. They do not seem to be similar to the ones shown in the images you linked above, as the Hybodus specimens do not appear to be completely round in cross section and seem to taper much more than the Alabama specimens. Thanks for everyones comments so far. Link to comment Share on other sites More sharing options...
hybodus Posted July 1, 2009 Share Posted July 1, 2009 I don't think it is rostral frags. Perhaps Hybodus, and if it is really this species, it is a "dorsal prickle". Here is one of Hybodus : http://www.buriedtreasurefossils.com/image...ks6/M1185-P.jpg And here a Jurassic Hybodus : http://www.elasmo-research.org/education/e...age/hybodus.gif You can see the prickles on the dorsal fins. Coco Hi Coco, The specimens are from the Eocene.... Hybodus sp. became extinct in the cretaceous.... Link to comment Share on other sites More sharing options...
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