[Annelida] Fwd: Late Ordovician "worm"

Sergio Salazar via annelida%40net.bio.net (by savs551216 from hotmail.com)
Wed Nov 1 11:57:27 EST 2006


Dear Geoff, Markus and colleagues,

I think the fossil is a nematod, probably allied to the Chromadoridae. A 
nice recent paper in Hydrobiologia by Verschelde et al. (2006, 571:17-40), 
includes some SEM and drawing emphasizing the longitudinal keel.

Have fun,

Sergio


>From: Geoff Read <g.read from niwa.co.nz>
>Reply-To: g.read from niwa.co.nz
>To: annelida from magpie.bio.indiana.edu
>Subject: [Annelida] Fwd: Late Ordovician "worm"
>Date: Wed, 01 Nov 2006 08:19:22 +1300
>
>Replies with taxa id suggestions to the list and to Markus Martin would be 
>good.
>
>Geoff
>
>-------- Original Message --------
>Subject: 	Late Ordovician "worm"
>Date: 	Sun, 29 Oct 2006 22:48:19 -0500
>From: 	markus martin <brge.com from hotmail.com>
>To: 	<g.read from niwa.co.nz>
>
>
>
>Dear Geoff,
>
>My name is Markus Martin.  I'm a vocational paleontologist currently
>excavating a conservation deposit of Late Ordovician shale in Northern
>New York.  Most of my work centers on arthropods(trilobites) which are
>pyritized with preserved soft tissues and internal organs.  However,
>I've come across several of these little "worms", for lack of better
>terminology.  These specimens are incredibly preserved with fantastic
>detail, but all in all, no idea what they are!  I do some joint
>research with Yale University and have passed specimens along.  Everyone
>is at a loss of where to place these pesky little worms.  I'm going to
>do a micro-ct scan if I ever get time which may shed some light.
>
>I'm hoping you, or someone you know may be able to help!  All specimens
>are 9mm-20mm and coiled.  In the attached photo, note the stiff chord
>running the length of the specimen, as well as what appears to be the
>fanning out of the presumed tail region, and a strange attachment
>resembling a tube which sticks out a bit.  The environment was benthic,
>90-180 meters depth, nearly anoxic and sulfur rich.  I'm great with
>arthropods, not so good in this category!
>
>Sincerely,
>Markus Martin
>brge.com from hotmail.com
>
>Markus later added:
>This 3D pyritized fossil of a soft tissue organism is about as good as it 
>gets for 443 million years old.  I don't expect anyone to shout a species 
>name, but a few ideas would be a huge help.  The deep water, nearly anoxic, 
>benthic environment is a presumed one based on classically accepted 
>theories of similar conservation deposits. However, the fauna coming out of 
>these new shale beds suggest a much shallower higher energy ecosystem.  
>There is the possibility that organisms such as this "worm" were 
>transported from a shallower region during a massive storm surge.
>
>The nature of the pyrite crystals themselves are framboidal(like little 
>raspberries), which may suggest that there were sulfate reducing bacteria 
>living in or on the organism and were active upon burial.  This 
>relationship could be chemoautotrophic in nature, if that occurs with 
>annelids or nematodes as it does in some arthropods it could help in 
>identification.  This was an unexpected find and probably the most 
>important one this year for us!  Thanks for your help!
>
>


><< IMG_1043.JPG >>


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