More on Scyllaea photos

November 29, 1998
From: Jim Needham

Dear Bill,

Again I want to thank you for your interest and time.

More info:
In image "nudi-5" although it is just visible, there is a light blue spot just above, to the right in the pix, and about half way along the  line of "white elongated
spots".  Also there are some brownish spots above the white spots.  These brown spots were, at times, a very intense, bright, light blue.  They stood out more than the white.  Also the tips or spikes on the cerata, the protrusions on each side of the top back ??,  were at times an intense white.

I looked at the pix that you referenced, and although similar in form, I never noted any transparentness in the 6 that I had. Would this indicate a different species ?  Or a different adaptation ?

I have also seen a couple of other pixs which referenced this critter, but looked nothing like these. I guess it is like you said, "What one person calls 'x'. another person will call 'y'. It is unfortunate that I do not have a good camera, the one I used was barrowed and was one of those point and click automatic things, don't even know the make.

Another observation:
Quite often, I would find these guys on the sides of the refugia that I had them in.  It did have a brown algae on it.  I was hoping that they were feeding, but I guess not.

I failed to mention that the pix posting to, as well as the digitizing, was done by my friend. His name is Ron Cadby, owner of  He is a "web presence provider"  It was his camera also.  I am in a quandary as to the appropriatness/method of giving him credit for his efforts in this endeavor.  I would like to, but I will leave that up to your expetise.

In reference to Hydroids:
Could you point me to some more references, on line if possible.  I am thinking of trying to establish a species specific tank for these nudis.  I am new to aquaria and have little to zero background in zoo, bio or chem, my background is ee & me.  Also art.

Again, thank you for your time.


P.S.  I am thinking of send e-mail to Dee Owens, the person who asked the original    question about these guys, it was dated 21 Mar, 98.  Just incase they had given up on your site.  March to November is a long time.....  Is that OK by you ?

Needham, J., 1998 (Nov 29) More on Scyllaea photos. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Jim,
Thanks for the further information. I thought I could see a trace of blue in one of your photos. I remember reading somewhere that it has blue markings as you describe. The other differences in colour between your specimen and the photo I linked to probably represent intraspecific variation. Often there can be a range in a species between those with heavy skin pigmentation and those with very sparse pigmentation and so a translucent - transparent appearance.

I think leaving in your mention of Ron Cadby is probably the best way to acknowledge his help. Concerning information on growing hydroids. I'm afraid apart from suggesting a continuous running seawater system I can't really help. There are a lot of sites for aquarium care and maintenance etc on the web. I don't search them often but I'm sure if you use one of the main search engines you should soon see if there is something relevant on the site.

Your last question: can you contact Dee Owens? Of course you can. That is the whole point of the Sea Slug provide information and to provide a point of contact between people with similar interests. My understanding is that most people who send messages to the Forum get useful direct correspondence from other readers / participants. All I ask is that if any interesting information arises from this "behind the scenes" chatting, you let us all know.

Best wishes,
Bill Rudman.

Rudman, W.B., 1998 (Nov 29). Comment on More on Scyllaea photos by Jim Needham. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


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