hitchiker ID

[kilroy217]

anybody know what this is?

 

[docklink]

Specifically, no. Based on the ridge and thickening centrally and what appears to be eye stalks at the left end of the thing, I'd guess some type of nudibranch though it could be a flat worm. I'd leave it alone unless you see it attacking something more desirable.

 

[kilroy217]

I was thinking possibly lettuce nudibranch? It does have what appear to be eyes on the left side. For scale, it's about an inch long and maybe a quarter of an inch wide. Thanks for the help

 

[divemonster]

it doesn't look like a lettuce nudibranch. here is a pic of the lettuce nudibranch in my tank

I think is a polyclad flatworm.

 

[kilroy217]

If it is a polyclad flatworm, is that good or bad?

 

[noahm]

The nudis generally will have some kind of defined 'head' and 'tail' ends. If you can see a head or structure at one end and a tuft, bump, or permanent structure about 3/4 toward the tail, you probably have a nudi or sea slug of some sort (there are too many kinds). The flatworms generally have a very loosely defined shape, sometimes a recognizable head and tail, and lack near as much of a raised central area though that is not definite. Long story short, get a better pic

Here are some Carribean flattys

http://www.rzuser.uni-heidelberg.de/~bu6/car_gall01.html

Some can be mollusk predatory i.e. clam killers, but just keep an eye on it. catch it w/a credit card and net or your hand if you need to.

 

[Guygettnby]

anybody find out what this is? i just found an extremely large one of these in my live rock.

 

[noahm]

it is going to be a nudibranch or large flatworm. Very difficult to ID specifically unless it is one of the very obvious types. How large... pic? Some are harmless, others not. Most eat a specific thing. I would catch it, take a pic, and post it on the inverts forum if you really want ID. There is also a Sea Slug Forum that covers all of these critters.

http://www.seaslugforum.net/

 

[JJP161]

I found something along these lines in my tank too. It would only come out at night and could move very fast. You could almost see through the thing. We never found out what is was for sure so I finally removed it to be on the safe side.

 

[noahm]

<a href=showthread.php?s=&postid=14819957#post14819957 target=_blank>Originally posted</a> by JJP161
I found something along these lines in my tank too. It would only come out at night and could move very fast. You could almost see through the thing. We never found out what is was for sure so I finally removed it to be on the safe side.

Fast moving....most likely polyclad flatworm. Nudis tend to stick like a slug to the surface. The flattys can undulate/swim over it quite easily.