[Annelida] RE: Oligochaete with anal cirri?

Jennifer Davenport via annelida%40net.bio.net (by jdavenport from terraenv.com)
Thu Feb 2 09:29:25 EST 2012


Opistocytidae oligochaetes have 3 pygidial appendages, but wouldn't have capillary chaetae in the both rami as Christer indicated.  From your pictures, it reminds me of the new Raphidrilus species that Wagner Magalhaes, Dr. Julie Bailey-Brock and I published last year.  Maybe it could be a Raricirrus species in the family Ctendodrilidae?  Do the thicker S-shaped chaetae have any serrations or are they smooth?  The only problem with this identification is the presence of the anal cirri in your specimens and the lack of branchiae.  I don't believe any Raricirrus species have anal cirri.  Good luck!

Jennifer Davenport, M. Sc.
Terra Environmental Services, Inc.
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jdavenport from terraenv.com
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-----Original Message-----
From: annelida-bounces from oat.bio.indiana.edu [mailto:annelida-bounces from oat.bio.indiana.edu] On Behalf Of Geoff Read
Sent: Thursday, February 02, 2012 12:34 AM
To: Polychaete mailing list
Subject: [Annelida] RE: Oligochaete with anal cirri?

And here is a couple of small images, one of either end.  Magnification x200 or so.

Geoff

> -----Original Message-----
> From: annelida-bounces from oat.bio.indiana.edu [mailto:annelida- 
> bounces from oat.bio.indiana.edu] On Behalf Of Geoff Read
> Sent: Thursday, 2 February 2012 2:58 p.m.
> To: Polychaete mailing list
> Subject: [Annelida] Oligochaete with anal cirri?
>
> Dear all,
>
> Quick question? Do oligochaetes ever have a pair of anal cirri?  I 
> have been looking at offshore samples from mobile coarse sands with 
> some interesting small worms in them, and there is this apparent 
> oligochaete (or not) which has a lovely pair of delicate anal cirri.  
> It has a long prostomium, or perhaps it's the pygidium if I've 
> oriented it wrong way round (it's hard to say), is exceedingly thin
> (0.15 mm w, & TL 10 mm) like a marine oligochaete, has mixed 
> capillaries and slightly thicker shorter unifid S-shaped single 
> chaetae.  What do you reckon it could be if not an oligochaete?  There 
> are no tentacles along the body (as in cirratulids and affiliates). 
> There is a polygordiid genus which has chaetae, but apparently not along the whole body as this worm has.
>
> Thanks in advance for your ideas to enlighten me.

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