Spionid worm?

[ackshee]

I got some live rock the other day from a local fish store. I lifted it up today to move it across the aquarium, and noticed a little worm on the underside, camouflaging itself in gravel. It looks similar to photos of spionid worms, but are there other types of worms that look like this as well? It's very small, maybe 10 mm in length.

 

[Crabs McJones]

spionid worm would be my guess as well

 

[ackshee]

Cool, thanks. It seems like there are mixed opinions on spionid worms. Good, bad, or just meh?

 

[ISpeakForTheSeas]

I got some live rock the other day from a local fish store. I lifted it up today to move it across the aquarium, and noticed a little worm on the underside, camouflaging itself in gravel. It looks similar to photos of spionid worms, but are there other types of worms that look like this as well? It's very small, maybe 10 mm in length.

I'd guess Chaetopterid worm:

In this case, it's probably a Chaetopterid worm - they're very similar to Spionid worms, but they tend to prefer burrowing in the sand instead of in the rocks, and they reportedly tend to have longer palps.

That said, I say probably because to make a proper ID involves removing the worm from its tube and getting pics of the body out of the tube, which just isn't feasible.

Generally, these aren't a problem unless their numbers start getting out of hand.

 

[vetteguy53081]

Looks like a polychaeta worm which spends its time in self built tunnels and is a scavenger