Attempted Nudibranch ID - am I right?

[The Escaped Ape]

Well, it will be difficult to ID from the photos I'm able to post, so apologies in advance for that. I tried taking pics under the actinics and with a compact camera that I bought a few years back for the macro function and now I've finally got a tank, I've found out it doesn't work great on small critters not immediately next to the glass. Plus the camera's now draining perfectly good batteries almost instantaneously, so it doesn't stay on for long enough for me to get any more shots now the halide has come on (why it chooses now to fail, after I've just spent so much on a reef tank, I don't know...).

I think I've narrowed this down to a Thuridilla flavomaculata, order Sacoglossa. It came in with some live rock I ordered from Ishigaki Island in Okinawa (I'm in Japan). If I'm right, it's a harmless herbivore. Let's hope I'm right...

 

[The Escaped Ape]

Hmm, I've been doing some more reading and apparently if it were from the order Saoglossa, it would be a Sacoglossan Sea Slug, not a nudibranch. I'm not sure what the difference is between a nudibranch and a sea slug now...

 

[greenbean36191]

Yep, your slug is Thuradilla and is a harmless sacoglossan.

Nudibranchs are just the sea slugs that are in the order Nudibranchia. All nudibranchs are sea slugs, but not all sea slugs are nudibranchs.

 

[The Escaped Ape]

I guess Nudibranch is that a cool a word people like me want to use for everything. Sea slug doesn't quite have the same romance of the reefs about it. :lol:

But actually that explanation really helped! Also thanks for the confirmation of the ID. It's the coolest hitchhiker to have come in with the rock (not bad considering it's aquacultured, it's also got what looks to be a transparent tunicate on it).

Here's a blurry picture of the assumed tunicate. Hard to focus on something that's almost transparent, particularly with a not great camera...

Thanks again.

 

[Bongo Shrimp]

All nudibranchs are sea slugs, but not all sea slugs are nudibranchs.

:crazy1::crazy1::crazy1: