This is a new kind of worm for me

[Sharlow]

Found this little guy crawling about a bag of zoas on a small rock from my LFS. I'm normally pretty good at I.D.ing hitchhikers, and have several pest tanks, I'm just not sure what this guy would go in. Clear front section with a white line dividing the back half which is all black. No antenne or legs, it gets around like a flatworm, but it's plump. About the size and thickness of a grain of rice. It also zooms about.

I have a flatworm tank with Polyclads and ghosts, but this dude doesn't seem to be either of those, nor a nudi or AEFW. Any ideas on what I have?

 

[F i s h y]

Could it be the larval form of some unknown worm?

 

[Sharlow]

Could it be the larval form of some unknown worm?

I couldn't say. I've raised most common tank worms, and I've never seen one of these.

 

[Sharlow]

I made a small holding tank for it with some tank sand, a small rock, and a few Rissiod snails to see if it was predatory. It instantly started grazing the small rock and sand, feeding in the same way a Peanut worm would, extending it's front half in an arch and grabbing onto the surface area.