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- From: weemba@sagi.wistar.upenn.edu (Matthew P Wiener)
- Newsgroups: talk.origins
- Subject: Re: Burgess Shale problematica again (was Re: SWAA Lecture)
- Message-ID: <106830@netnews.upenn.edu>
- Date: 27 Jan 93 16:40:51 GMT
- References: <1jelm6$ejh@agate.berkeley.edu> <1785@tdat.teradata.COM> <1993Jan26.230125.15462@s1.gov> <106720@netnews.upenn.edu>
- Sender: news@netnews.upenn.edu
- Reply-To: weemba@sagi.wistar.upenn.edu (Matthew P Wiener)
- Organization: The Wistar Institute of Anatomy and Biology
- Lines: 28
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- In-reply-to: rowe@pender.ee.upenn.edu (Mickey Rowe)
-
- In article <106720@netnews.upenn.edu>, rowe@pender (Mickey Rowe) writes:
- >> I know about the Hallucigenia identification (it had to be
- >>flipped over), but where does Wiwaxia go?
-
- >Look for a polychaete worm called a sea mouse. The resemblence is
- >quite striking.
-
- The general resemblance was noticed a long time ago--I think maybe as
- far back as Walcott. What's new is that there are also small details
- which correspond rather well.
-
- >>I've also heard of one for Opabinia, also, and even Anomalocaris,
- >>though I don't recall them offhand.
-
- There have been several modern suggestions, including aschelminths and
- even arthropods. The problem is, this is too easy. Nothing definitive
- stands out. In contrast, the reclassifications of Hallucigenia and
- Wiwaxia are probably definitive.
-
- Conway Morris has a new NATURE review article, "The fossil record and
- the early evolution of the Metazoa", v361, p219 (21 Jan 9), pp219-225.
- For what it's worth, in his phylogeny, he places the anomalocariids
- closer to the trilobites, chelicerates, and crustaceans than he does
- the uniramians, onychophorans and tardigrades. I do recall uniramian
- placement has been subject to recent molecular progress, but I don't
- recall the details.
- --
- -Matthew P Wiener (weemba@sagi.wistar.upenn.edu)
-