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.
Please consider the environment before printing this email.
NIWA is the trading name of the National Institute of Water & Atmospheric Research Ltd.