Nudibranch? Good or bad?

[wmv]

Today I found this little white slug on my glass and if you look closely you can see its antenna. Anyone know if this is a nudibranch or something else? And if it’s good or a pest?

 

[fishguy242]

hi, looks like type of sea hare "bunny"
@EeyoreIsMySpiritAnimal @Goaway ,ID ?

 

[EeyoreIsMySpiritAnimal]

hi, looks like type of sea hare "bunny"
@EeyoreIsMySpiritAnimal @Goaway ,ID ?

I'd need a few more pics, maybe from the top...

 

[EeyoreIsMySpiritAnimal]

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[Goaway]

Today I found this little white slug on my glass and if you look closely you can see its antenna. Anyone know if this is a nudibranch or something else? And if it’s good or a pest?

Take a search on jorunna parva and see what you think. I see black speckles on the body, but could be from the glass.

 

[ISpeakForTheSeas]

I agree that more white light pics of various angles (particularly of the top) would be helpful. That said, I’m pretty confident it’s not Jorunna parva, as it lacks the gill structure that would be the “tail” of the sea bunny (though I agree the spots in the pic definitely make it look similar).

 

[wmv]

Thanks for the input everyone. Not long after I took that picture it disappeared into the rocks and finally today came back out. And it’s much bigger. Here’s some new pictures I was able to get under whiter lights. Any new ideas what it might be?

 

[ISpeakForTheSeas]

Thanks for the input everyone. Not long after I took that picture it disappeared into the rocks and finally today came back out. And it’s much bigger. Here’s some new pictures I was able to get under whiter lights. Any new ideas what it might be?

Sorry for the slow response; it seems to be an Arminid (taxonomic family Arminidae) nudibranch, possibly a Dermatobranchus sp., though top-down pics of the back would be needed for a solid ID.

If it is an Arminid, then it's not reef safe - they prey on Octocorals (soft corals, gorgonians, GSP, etc.) - so I'd remove it and check any octocorals you have for more.

 

[wmv]

Sorry for the slow response; it seems to be an Arminid (taxonomic family Arminidae) nudibranch, possibly a Dermatobranchus sp., though top-down pics of the back would be needed for a solid ID.

If it is an Arminid, then it's not reef safe - they prey on Octocorals (soft corals, gorgonians, GSP, etc.) - so I'd remove it and check any octocorals you have for more.

Thanks for the input. I haven’t seen it for a couple of days but next time I do I’ll be sure to catch it. From some quick research it looks to me like a dermatobranchus semilunus, what are your thoughts on that?

Dermatobranchus semilunus | Nudibranch Domain

nudibranchdomain.org

 

[ISpeakForTheSeas]

Thanks for the input. I haven’t seen it for a couple of days but next time I do I’ll be sure to catch it. From some quick research it looks to me like a dermatobranchus semilunus, what are your thoughts on that?

Dermatobranchus semilunus | Nudibranch Domain

nudibranchdomain.org

There are quite a few species in the genus (including several undescribed species), and a number of them look similar enough that I don't feel confident in giving an ID without a top-down shot under white light; either way, though, if it's in the genus, you want it out.