Big Worm video (Dero sp.) and a question

[billporter1456]

I had no idea what this was until carlos.uruguay identified it for me. Can someone explain the apparent tail to head direction of what looks to me like peristalsis of the digestive tract? It just looks like it's moving in the wrong direction and no, I didn't reverse the direction of the video playback.

https://www.youtube.com/watch?v=SPa99qopFB4

[Tom Jones]

I do believe that is the most dramatic soundtrack ever , for an Annelid worm!

Tom

[carlos.uruguay]

Perhaps related to the breathing bringing the oxygen coming from the gills
(It seems to be dying)

[Jacek]

Super

[Olympusman]

Dero limosa.
The peristalsis looks like what I commonly see in all aquatic worms. I think they "swallow" and then reform the muscles for the next gulp, so it may appear to be moving in reverse.

[billporter1456]

Perhaps related to the breathing bringing the oxygen coming from the gills
(It seems to be dying)

Yes, after watching it several times, I think it may be the blood being "pumped" that makes it appear that the gut is displaying reverse peristalsis.

[billporter1456]

Dero limosa.
The peristalsis looks like what I commonly see in all aquatic worms. I think they "swallow" and then reform the muscles for the next gulp, so it may appear to be moving in reverse.

Thanks, Olympusman, that helps to explain what I was seeing.

[billporter1456]

Super

Thanks, Jacek! I'm glad you liked it.

[carlos.uruguay]

Thanks Michael for the information