Cool Marine Tubificid

Whole worm, notice change in cuticle over what I
assume is the clitellum.
















Anterior end of same worm.















Prostomium, which is evidently retracted. Also,
notice condition of the anterior setae.















Posterior region; this image shows condition of the posterior
setae, but not that well. One of the teeth (upper?)
seems to be reduced more in the posterior setae than
in the anterior setae.