[Annelida] RE: Oligochaete with anal cirri?

Fauchald, Kristian via annelida%40net.bio.net (by FAUCHALD from si.edu)
Thu Feb 2 09:57:17 EST 2012


At one end, something like  5 chaetigers back there seems tom be some break in the body, just an accident or is that a real structure?  Just asking, Kristian

________________________________________
From: annelida-bounces from oat.bio.indiana.edu [annelida-bounces from oat.bio.indiana.edu] On Behalf Of Andy Mackie [Andy.Mackie from museumwales.ac.uk]
Sent: Thursday, February 02, 2012 8:04 AM
To: Geoff Read; annelida from net.bio.net
Subject: Re: [Annelida] RE: Oligochaete with anal cirri?

Paraonid? Questid?


On 02/02/2012 05:34, "Geoff Read" <Geoffrey.Read from niwa.co.nz> wrote:

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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