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 24, 2006 at 18:16:55:
In Reply to: pic of the possible Anomalocarid posted by Joe Bauman on December 24, 2006 at 13:39:01:
With great interest I would like to point out something about this large arthropod. Anomalocaridids are typically characterized by poor sclerotization, and by possession of large lateral swimming lobes. I know of none with spinose segment endings such as this creature possesses. Thus, I rather think that this is no anomalocaridid, but some other very interesting Cambrian arthropod, perhaps a helmetiid of some sort, for example, see the spinose nature of Rhombicalvaria among the figured Helmetiidae here:
http://www.trilobites.info/triloclass.htm#orders
Or perhaps it is some sort of megacheiran, as several of those also have the kind of segmentation and spines as depicted. One thing is certain, I have not seen anything quite like the serrated tri-pronged ending that this beastie has! The furcae of Chengjiang anomalocaridids are simple antennaeform or whiplike affairs, and in a pair, not a triplet. The fantail array of anomalocaridids is likewise more like dorsal extensions of the lateral swimming lobes, not these elaborate sawtooth projections! Very very interesting! and are those fragile walking limbs near the anterior end?
Call it what you like, for me it is quite different in several ways from your standard anomalocaridid. At least we are quite agreed it is no graptolite! ;)
a problematic arthropod almost certainly.
: Guide is kindly assisting me in hosting this pic of the possible Anomalocarid fossil I found in 1991, a fossil which I gave to Dr. Richard Robison of the University of Kansas to donate to a collection. Through discussions in this forum, I understand now that it may be described by the chief of paleontology at that university. I began to suspect that it might be an Anomalocarid when I saw some illustrations of these wonderful creatures posted by Dr. Gon, and contacted him. He placed my first view on the forum. Now I would like to post a photo that I created by combining the two halves of the impression, that is, both sides of the split rock. I used photos of the specimen that Dr. Robison sent me. You can see where a small ridge of rock was taken off by Dr. Robison or someone else at Kansas to show the middle tail better; compare that with the view I took earlier, which is in the "Unknown beastie!" thread. To combine them I employed astronomy software that normally is used to stack photos and eliminate noise. It allows one to designate two points in each view that will be superimposed, assuring that other parts of the photo will be superimposed also. I purchsed the MaxImDL software for my astronomy photos, and found it works well with fossils too. I found this specimen not too far from Marjum Pass, Millard County, Utah. I contacted the scientist and donated it because I believe rare specimens should be in museums and studied. Best wishes, Joe Bauman, Salt Lake City.

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Message: : With great interest I would like to point out something about this large arthropod. Anomalocaridids are typically characterized by poor sclerotization, and by possession of large lateral swimming lobes. I know of none with spinose segment endings such as this creature possesses. Thus, I rather think that this is no anomalocaridid, but some other very interesting Cambrian arthropod, perhaps a helmetiid of some sort, for example, see the spinose nature of Rhombicalvaria among the figured Helmetiidae here: : http://www.trilobites.info/triloclass.htm#orders : Or perhaps it is some sort of megacheiran, as several of those also have the kind of segmentation and spines as depicted. One thing is certain, I have not seen anything quite like the serrated tri-pronged ending that this beastie has! The furcae of Chengjiang anomalocaridids are simple antennaeform or whiplike affairs, and in a pair, not a triplet. The fantail array of anomalocaridids is likewise more like dorsal extensions of the lateral swimming lobes, not these elaborate sawtooth projections! Very very interesting! and are those fragile walking limbs near the anterior end? : Call it what you like, for me it is quite different in several ways from your standard anomalocaridid. At least we are quite agreed it is no graptolite! ;) : a problematic arthropod almost certainly. : : Guide is kindly assisting me in hosting this pic of the possible Anomalocarid fossil I found in 1991, a fossil which I gave to Dr. Richard Robison of the University of Kansas to donate to a collection. Through discussions in this forum, I understand now that it may be described by the chief of paleontology at that university. I began to suspect that it might be an Anomalocarid when I saw some illustrations of these wonderful creatures posted by Dr. Gon, and contacted him. He placed my first view on the forum. Now I would like to post a photo that I created by combining the two halves of the impression, that is, both sides of the split rock. I used photos of the specimen that Dr. Robison sent me. You can see where a small ridge of rock was taken off by Dr. Robison or someone else at Kansas to show the middle tail better; compare that with the view I took earlier, which is in the "Unknown beastie!" thread. To combine them I employed astronomy software that normally is used to stack photos and eliminate noise. It allows one to designate two points in each view that will be superimposed, assuring that other parts of the photo will be superimposed also. I purchsed the MaxImDL software for my astronomy photos, and found it works well with fossils too. I found this specimen not too far from Marjum Pass, Millard County, Utah. I contacted the scientist and donated it because I believe rare specimens should be in museums and studied. Best wishes, Joe Bauman, Salt Lake City.

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Message:	: With great interest I would like to point out something about this large arthropod. Anomalocaridids are typically characterized by poor sclerotization, and by possession of large lateral swimming lobes. I know of none with spinose segment endings such as this creature possesses. Thus, I rather think that this is no anomalocaridid, but some other very interesting Cambrian arthropod, perhaps a helmetiid of some sort, for example, see the spinose nature of Rhombicalvaria among the figured Helmetiidae here: : http://www.trilobites.info/triloclass.htm#orders : Or perhaps it is some sort of megacheiran, as several of those also have the kind of segmentation and spines as depicted. One thing is certain, I have not seen anything quite like the serrated tri-pronged ending that this beastie has! The furcae of Chengjiang anomalocaridids are simple antennaeform or whiplike affairs, and in a pair, not a triplet. The fantail array of anomalocaridids is likewise more like dorsal extensions of the lateral swimming lobes, not these elaborate sawtooth projections! Very very interesting! and are those fragile walking limbs near the anterior end? : Call it what you like, for me it is quite different in several ways from your standard anomalocaridid. At least we are quite agreed it is no graptolite! ;) : a problematic arthropod almost certainly. : : Guide is kindly assisting me in hosting this pic of the possible Anomalocarid fossil I found in 1991, a fossil which I gave to Dr. Richard Robison of the University of Kansas to donate to a collection. Through discussions in this forum, I understand now that it may be described by the chief of paleontology at that university. I began to suspect that it might be an Anomalocarid when I saw some illustrations of these wonderful creatures posted by Dr. Gon, and contacted him. He placed my first view on the forum. Now I would like to post a photo that I created by combining the two halves of the impression, that is, both sides of the split rock. I used photos of the specimen that Dr. Robison sent me. You can see where a small ridge of rock was taken off by Dr. Robison or someone else at Kansas to show the middle tail better; compare that with the view I took earlier, which is in the "Unknown beastie!" thread. To combine them I employed astronomy software that normally is used to stack photos and eliminate noise. It allows one to designate two points in each view that will be superimposed, assuring that other parts of the photo will be superimposed also. I purchsed the MaxImDL software for my astronomy photos, and found it works well with fossils too. I found this specimen not too far from Marjum Pass, Millard County, Utah. I contacted the scientist and donated it because I believe rare specimens should be in museums and studied. Best wishes, Joe Bauman, Salt Lake City.
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