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January 9, 2009

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Shark Teeth

Could A. Grandi...

Could A. Grandis be posterior Benedi's?

5/1/2004 10:46:09 PM

legacyForum

725 posts

Could A. Grandis be posterior Benedi's?

Ever notice how Benedis and Giant Threshers look a bit alike? Neither of these species are very well known. Could Big "threshers" be posterior Benedis? I know that a supposedly complete dentition of P. Benedi was found several years ago, but have been unable to find pictures to examine. This seemed like a neat discussion topic. What do you guys think? Drew

5/2/2004 8:20:52 PM

legacyForum

725 posts

Re: Could A. Grandis be posterior Benedi's?

Hello Drew, A topic was started by Kris months ago on this forum. I too had posted a reply. As I already said,you too mentioned, and most know!, little is known about this species which still has to be recognised and only Leriche 1942 and Case 1982 mentioned them. To answer your question. Although they look a little similar especially the smaller ones they are not P.benedeni. One that most stands out is the dental band (bourlet) which is present on P.benedeni and is missing on alopias g* teeth. besides, when both these teeth reaches the (aproxx)25mm up, the difference is very evident.other differences there are but I`m not a palaeontologist to explain them in words. If you want to see a reconstructed P.benedeni, buy Bretton W.Kent book. Fossil sharks of the Chesapeake Bay. Kent when on to suggest that alopias grandis* teeth are simply upper Lateral teeth of I.Hastalis. So you can see the confusion these teeth have generated. My believe is That they are a stand alone species which still has to be studied truly. Do you have some specimens of these species Drew? W

5/14/2004 1:29:57 AM

legacyForum

725 posts

Re: Could A. Grandis be posterior Benedi's?

Interesting theory. I have a posterior P. benedeni, but so far have been unable to get a giant thresher tooth. I doubt they are the same species. From the pics I've seen, aside from the bourlette difference the giant threshers are not as robust/thick as benedeni. I put some pics on my website if anyone is interested. The first is a posterior benedeni, the second is giant threshers, and the last two are super rare serrated giant threshers. http://bellsouthpwp.net/m/e/megtooth/bene3_0.jpg http://bellsouthpwp.net/m/e/megtooth/bigeyes.jpg http://bellsouthpwp.net/m/e/megtooth/thresh1.jpg http://bellsouthpwp.net/m/e/megtooth/thresh3.jpg

5/19/2004 7:53:26 PM

legacyForum

725 posts

Re: Could A. Grandis be posterior Benedi's?

Last week I found a very small Benedeni posterior. Some root similarity there is, but the chevron and as Eddie said, the crown is never robust. another indication of the difference is in pointed tip and a very and a very prominent D shape crown in the benedeni. interesting speciemens. Any info on them, example.. size,epoch,etc. Thanks W

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