Great the spawn of the old one's in our sewers!
But seriously those are sum nasty critters. The whole thing has the feel of a horror movie
waiting to happen. If we are real lucky they have come to conquer us and take our feces!! 

But seriously those are sum nasty critters. The whole thing has the feel of a horror movie
waiting to happen. If we are real lucky they have come to conquer us and take our feces!! 
Thanks for the video – I had not see it before. No, these are not bryozoans! They are clumps of annelid worms, almost certainly tubificids (Naididae, probably genus Tubifex). Normally these occur in soil and sediment, especially at the bottom and edges of polluted streams. In the photo they have apparently entered a pipeline somehow, and in the absence of soil they are coiling around each other. The contractions you see are the result of a single worm contracting and then stimulating all the others to do the same almost simultaneously, so it looks like a single big muscle contracting. Interesting video.
Thanks for the video – I had not see it before. No, these are not bryozoans! They are clumps of annelid worms, almost certainly tubificids (Naididae, probably genus Tubifex). Normally these occur in soil and sediment, especially at the bottom and edges of polluted streams. In the photo they have apparently entered a pipeline somehow, and in the absence of soil they are coiling around each other. The contractions you see are the result of a single worm contracting and then stimulating all the others to do the same almost simultaneously, so it looks like a single big muscle contracting. Interesting video.
Originally posted by PowerSlave
Just noticed this video of these guys taking a shot gun to a couple of those Bryozoa
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