Re: pic of the possible Anomalocarid

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Re: pic of the possible Anomalocarid

Posted by Sam Gon III ( 66.91.223.XXX ) on December 28, 2006 at 00:04:32:
In Reply to: Re: pic of the possible Anomalocarid posted by Fossilcrazy on December 27, 2006 at 22:23:19:
Hi John!
I remember starting this process with the thought "I don't know enough about graptolites." I'm intrigued by your description of sclerites. Can you post up an example image out of Palmer & Richards or any other source that gives the combination of size, volume, and segmented structure in a graptolite that roughly parallels Joe's 4" specimen? That would be an eye opener for me, certainly. My searches for images of graptolites on Google have come up with nothing even close, so I look to you for the "aha!" image.
I also admit to much puzzlement over the three-branched almost plant-like arrangement of the extensions out of the presumed posterior end. If your graptolite argument helps there as well, that would count for much.
Thanks! I point out a problem in thought-process here though: You rejected an arthropod hypothesis on the basis of not detecting clear segments, but when the segments were pointed out, you indicate this doesn't exclude graptolites. Seems to me you shouldnt have your cake and eat it too. The thick part of the thing looks strongly arthropodan to me... I probably look at too many arachnomorphs to be purely objective... still, an arthropodan sclerite is not equivalent of a sclerotized tube. Arthropodan sclerites are sequential pieces of a metameric exoskeletal structure. A sclerotized tube need not be segmented at all, just hardened, by basic definition.
: Gentlemen, I'd like nothing better than for you to have in your possesion the tail of an Anomalocaris.
: I must stress that Dendroidic graptolites were indeed alive and well in the Middle Cambrian. Funny you should use the term "sclerites" because Graptolites are scleritized tubes. After viewing many plates in Palmer and Richards book on "Graptolites";I must insist that graptolite still seems valid. If Stephen Gould was still alive, I know he would be calling it "key holing". Instead of making a jellyfish out of a Peytoia; we'd be making a telson out of a graptolite. Isn't fossil identifying a lot of fun?

Replies:

Re: pic of the possible Anomalocarid Fossilcrazy 20:20:08 12/28/06 (5)
- Re: pic of the possible Anomalocarid Inyo 09:23:29 12/29/06 (1)
  - Re: pic of the possible Anomalocarid Sam Gon III 11:22:14 12/29/06 (0)
- Re: pic of the possible Anomalocarid Sam Gon III 01:25:54 12/29/06 (0)
- Re: pic of the possible Anomalocarid Roz 20:34:25 12/28/06 (1)
  - Re: pic of the possible Anomalocarid Roz 20:37:00 12/28/06 (0)

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Message: : Hi John! : I remember starting this process with the thought "I don't know enough about graptolites." I'm intrigued by your description of sclerites. Can you post up an example image out of Palmer & Richards or any other source that gives the combination of size, volume, and segmented structure in a graptolite that roughly parallels Joe's 4" specimen? That would be an eye opener for me, certainly. My searches for images of graptolites on Google have come up with nothing even close, so I look to you for the "aha!" image. : I also admit to much puzzlement over the three-branched almost plant-like arrangement of the extensions out of the presumed posterior end. If your graptolite argument helps there as well, that would count for much. : Thanks! I point out a problem in thought-process here though: You rejected an arthropod hypothesis on the basis of not detecting clear segments, but when the segments were pointed out, you indicate this doesn't exclude graptolites. Seems to me you shouldnt have your cake and eat it too. The thick part of the thing looks strongly arthropodan to me... I probably look at too many arachnomorphs to be purely objective... still, an arthropodan sclerite is not equivalent of a sclerotized tube. Arthropodan sclerites are sequential pieces of a metameric exoskeletal structure. A sclerotized tube need not be segmented at all, just hardened, by basic definition. : : Gentlemen, I'd like nothing better than for you to have in your possesion the tail of an Anomalocaris. : : I must stress that Dendroidic graptolites were indeed alive and well in the Middle Cambrian. Funny you should use the term "sclerites" because Graptolites are scleritized tubes. After viewing many plates in Palmer and Richards book on "Graptolites";I must insist that graptolite still seems valid. If Stephen Gould was still alive, I know he would be calling it "key holing". Instead of making a jellyfish out of a Peytoia; we'd be making a telson out of a graptolite. Isn't fossil identifying a lot of fun?

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Message:	: Hi John! : I remember starting this process with the thought "I don't know enough about graptolites." I'm intrigued by your description of sclerites. Can you post up an example image out of Palmer & Richards or any other source that gives the combination of size, volume, and segmented structure in a graptolite that roughly parallels Joe's 4" specimen? That would be an eye opener for me, certainly. My searches for images of graptolites on Google have come up with nothing even close, so I look to you for the "aha!" image. : I also admit to much puzzlement over the three-branched almost plant-like arrangement of the extensions out of the presumed posterior end. If your graptolite argument helps there as well, that would count for much. : Thanks! I point out a problem in thought-process here though: You rejected an arthropod hypothesis on the basis of not detecting clear segments, but when the segments were pointed out, you indicate this doesn't exclude graptolites. Seems to me you shouldnt have your cake and eat it too. The thick part of the thing looks strongly arthropodan to me... I probably look at too many arachnomorphs to be purely objective... still, an arthropodan sclerite is not equivalent of a sclerotized tube. Arthropodan sclerites are sequential pieces of a metameric exoskeletal structure. A sclerotized tube need not be segmented at all, just hardened, by basic definition. : : Gentlemen, I'd like nothing better than for you to have in your possesion the tail of an Anomalocaris. : : I must stress that Dendroidic graptolites were indeed alive and well in the Middle Cambrian. Funny you should use the term "sclerites" because Graptolites are scleritized tubes. After viewing many plates in Palmer and Richards book on "Graptolites";I must insist that graptolite still seems valid. If Stephen Gould was still alive, I know he would be calling it "key holing". Instead of making a jellyfish out of a Peytoia; we'd be making a telson out of a graptolite. Isn't fossil identifying a lot of fun?
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