Talk:Trilobita

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:::::Arachnomorpha is a larger clade, containing chelicerates and all taxa closer to them than other living arthropods. The phylogeny of the Cambrian arthropods tends to shift a fair bit, so Fortey may be avoiding anything too fine-tuned.--[[User:Christopher|Christopher Taylor]] 09:34, 26 February 2007 (Perth)
:::::Arachnomorpha is a larger clade, containing chelicerates and all taxa closer to them than other living arthropods. The phylogeny of the Cambrian arthropods tends to shift a fair bit, so Fortey may be avoiding anything too fine-tuned.--[[User:Christopher|Christopher Taylor]] 09:34, 26 February 2007 (Perth)
::I've just put up phylogenies for [[Arthropoda]] and [[Arachnomorpha]] to hopefully help a little--[[User:Christopher|Christopher Taylor]] 09:56, 26 February 2007 (Perth)
::I've just put up phylogenies for [[Arthropoda]] and [[Arachnomorpha]] to hopefully help a little--[[User:Christopher|Christopher Taylor]] 09:56, 26 February 2007 (Perth)
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:::Where do these come from Christopher - I've wondered for quite awhile now? I just went back and read:  Fortey RA A. 2001. Trilobite systematics: The last 75 years. Journal of Paleontology 75:1141ā€“1151.; it had been a few years. What I like about Fortey is that he delineates between fact, fiction and speculation; apparently, when you reach his level of stature, you can adhere to the scientific cautionary principle. All his statements have appropriate caveats. I recommend we collectively use this 2001 paper as the trilobite / arthropoda guiding light. Iā€™m unaware of any startling cladistics studies that would render his review dated. Also note his differentiation between trilobites and soft-bodied trilobites, i.e., the lack of a calcareous exoskeleton in the latter. Given the many other lower Cambrian arthropods with cuticles, I vote for not making the softies a 10th Order.  [[User:RogerPerkins|RogerPerkins]] 08:46, 26 February 2007 (PST)

Revision as of 16:46, 26 February 2007

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