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From: John Harshman <john.harshman@gmail.com>
Newsgroups: talk.origins
Subject: Re: Nematode fossils 15 million years older than the Cambrian
 explosion?
Date: Tue, 19 Nov 2024 20:28:06 -0800
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On 11/19/24 6:38 PM, RonO wrote:
> https://www.science.org/content/article/mother-son-team-s-fossil-find-shows-how-nematodes-and-all-arthropods-arose
> 
> It looks like they have found nematode fossils in the same area that 
> they are finding ediacaran fossils.  They think the fossils are in 
> sediments 15 million years older than the Cambrian explosion 
> diversification.
> 
> They think that they represent early members of ecdysozoans.  Nematodes 
> are protostomes, but are more closely related to arthropods than other 
> protostomes.  This would mean that animals like the phylum mollusca 
> existed or at least branched off as multicellular animals long before 
> their appearance and diversification during the Cambrian explosion.

First, of course they aren't nematodes, and the article actually 
suggests they're "nematode-like", i.e. stem-ecdysozoans.

Second, Kimberella is probably either a mollusk or a 
stem-lophotrochozoan, so no ecdysozoan fossils are needed for that.