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 29, 2006 at 11:22:14:
In Reply to: Re: pic of the possible Anomalocarid posted by Inyo on December 29, 2006 at 09:23:29:
Would you be leaning more toward the arthropod hypothesis then, Inyo? and what do you think of Robison's feeling that it is an anomalocaridid of some sort? To me it doesn't seem to fit the anomalocaridid bauplan well at all. On the other hand, none of the other Cambrian arthropod groups I know of would cleanly fit this beastie...
: : It seems I have two challenges here. First, to come up with a convincing picture of a comparable candidate and the other is how to post the pic.
: : The truth is out there somewhere.
: My research of numerous images of graptolites contained in my extensive, personal collection of reference books has disclosed that only two kinds of graptos bear even a faint resemblance to the fossil Joe Bauman donated to paleontologist Dr. Robison at Kansas University. Specifically, a few species of the elongated, tapering Ordovician-early Silurian genera Climacograptus and Orthograptus possess a distinctive elongated trident-like, three-pronged "tail" at the "bottom end" of their stipes, mildly reminiscent of what Mr. Bauman found. But, these are graptoloid kinds, a major group of graptos that of course first appear in the geologic record during the early Ordovician--plus, they're nowhere near the size of the fossil whose zoological affinity is under debate. Then, too, only dendroid graptolites (a second major group of graptos) have been recovered from the middle Cambrian, the precise geologic age from which Mr. Bauman's specimen was collected; no graptoloid graptos occur in such primeval rocks. Dendroid varieties, as might be recollected by folks with graptolite familiarity, grew roughly fan-shaped rhabdosomes that are conveniently easy to identify in the rocks. In no way do they resemble the mystery specimen under discussion. For example, over at http://members.aol.com/Waucoba7/tr/toquima.html take a look at a typical dendroid graptolite--genus Callograptus--I collected from the Ordovician Vinini Formation in Nevada. The image is about halfway down the Web Page, by the way.

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Message: : Would you be leaning more toward the arthropod hypothesis then, Inyo? and what do you think of Robison's feeling that it is an anomalocaridid of some sort? To me it doesn't seem to fit the anomalocaridid bauplan well at all. On the other hand, none of the other Cambrian arthropod groups I know of would cleanly fit this beastie... : : : It seems I have two challenges here. First, to come up with a convincing picture of a comparable candidate and the other is how to post the pic. : : : The truth is out there somewhere. : : My research of numerous images of graptolites contained in my extensive, personal collection of reference books has disclosed that only two kinds of graptos bear even a faint resemblance to the fossil Joe Bauman donated to paleontologist Dr. Robison at Kansas University. Specifically, a few species of the elongated, tapering Ordovician-early Silurian genera Climacograptus and Orthograptus possess a distinctive elongated trident-like, three-pronged "tail" at the "bottom end" of their stipes, mildly reminiscent of what Mr. Bauman found. But, these are graptoloid kinds, a major group of graptos that of course first appear in the geologic record during the early Ordovician--plus, they're nowhere near the size of the fossil whose zoological affinity is under debate. Then, too, only dendroid graptolites (a second major group of graptos) have been recovered from the middle Cambrian, the precise geologic age from which Mr. Bauman's specimen was collected; no graptoloid graptos occur in such primeval rocks. Dendroid varieties, as might be recollected by folks with graptolite familiarity, grew roughly fan-shaped rhabdosomes that are conveniently easy to identify in the rocks. In no way do they resemble the mystery specimen under discussion. For example, over at http://members.aol.com/Waucoba7/tr/toquima.html take a look at a typical dendroid graptolite--genus Callograptus--I collected from the Ordovician Vinini Formation in Nevada. The image is about halfway down the Web Page, by the way.

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Message:	: Would you be leaning more toward the arthropod hypothesis then, Inyo? and what do you think of Robison's feeling that it is an anomalocaridid of some sort? To me it doesn't seem to fit the anomalocaridid bauplan well at all. On the other hand, none of the other Cambrian arthropod groups I know of would cleanly fit this beastie... : : : It seems I have two challenges here. First, to come up with a convincing picture of a comparable candidate and the other is how to post the pic. : : : The truth is out there somewhere. : : My research of numerous images of graptolites contained in my extensive, personal collection of reference books has disclosed that only two kinds of graptos bear even a faint resemblance to the fossil Joe Bauman donated to paleontologist Dr. Robison at Kansas University. Specifically, a few species of the elongated, tapering Ordovician-early Silurian genera Climacograptus and Orthograptus possess a distinctive elongated trident-like, three-pronged "tail" at the "bottom end" of their stipes, mildly reminiscent of what Mr. Bauman found. But, these are graptoloid kinds, a major group of graptos that of course first appear in the geologic record during the early Ordovician--plus, they're nowhere near the size of the fossil whose zoological affinity is under debate. Then, too, only dendroid graptolites (a second major group of graptos) have been recovered from the middle Cambrian, the precise geologic age from which Mr. Bauman's specimen was collected; no graptoloid graptos occur in such primeval rocks. Dendroid varieties, as might be recollected by folks with graptolite familiarity, grew roughly fan-shaped rhabdosomes that are conveniently easy to identify in the rocks. In no way do they resemble the mystery specimen under discussion. For example, over at http://members.aol.com/Waucoba7/tr/toquima.html take a look at a typical dendroid graptolite--genus Callograptus--I collected from the Ordovician Vinini Formation in Nevada. The image is about halfway down the Web Page, by the way.
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