Anna's Chromodoris. Lembeh Strait, Indonesia. Yap, Micronesia. Dumaguete, Philippines.
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Inset showing dark pitted surface in blue areas of mantle. E Picton. This is another of the Chromodoris quadricolor colour group of species characterised by black longitudinal lines, bluish backgrounds and orange borders.
This species has similarities to Chromodoris elisabethina but C. The only other chromodorid with similar pitted blue regions is Chromodoris westraliensis.
The animals illustrated here show the colour range within the species. The bottom animals matches best Bergh's original paintings. The orange border is just submarginal and in some specimens it is particularly faint. Zoological Journal of the Linnean Society 76 : Are Chromodoris annae known to feed on sea squirts?
It seems to me that these three nudibranchs are feasting on this Golden Sea Squirt. I was also impressed by how good they were camouflaged with their yellow and blue on that sea squirt with the same colors. Photographer: Franca Wermuth. Thanks for this curious observation. All I can say is that as with Robert Sozzani's earlier message, which you refer to, chromodorids are not known to feed on ascidians.
Of course if you find one actually biting into one then we will need to think again. Why they are aggregated on this sea squirt I have no idea. Certainly all the existing evidence shows that they are very specific feeders on particular sponges. Your animals also raise an identification problem which you first drew my attention to a couple of years ago [see message ]. At that time I suggested your animals were possibly a colour form of C.
There is also the possibility that they are C. I am not convinced they are C. I think we need to do more work on this group of species - including of course C.
Hi Bill and everyone! Finding a beautiful species is always a treat for us at Nudibranch. A tropical species we don't see often but have seen about a dozen times is Chromodoris annae. The first time we found it was at Old Woman Island in February According to Richard Willan it was a new record for southern Queensland. Last weekend we dived Shellacey Reef off Mooloolaba Queensland and found 2 animals posed ready for a photo session. We collected the animals to see if it would lay eggs and it did!
Photo attached. The egg mass is 28 mm in diameter and only 1. Length: mm. Photographer: Gary Cobb. It is always good to get photos of egg masses, I hope these photos are valuable for the Forum. Cheers Gary. Thanks for the great photo of the egg ribbon. Chromodoris annae is one of the the similarly coloured ' C. Just thought it would be nice to share these pictures of Chromodoris willani [upper], C. This is a very valuable photo as it is another example of similarly coloured species aggregating together on the same sponge which they are almost certainly feeding on.
It is a thorectid sponge of the genus Petrosaspongia. Interestingly, many of the black-lined chromodorids in the Pacific feed on this group of sponges, and the chromodorids are quite often found in multispecies groupings like this.
As they all store distasteful chemicals from their prey sponges in their mantles, I suspect that fish have learned to avoid black-lined slugs - a case of safety in numbers. Dear Bill, Five Chromodoris annae on- and around a white sponge. Although, also the red sponge in the background seems to have their interest. Locality: Anilao, 15 meter, Philippines, 30 December Length: max 5 cm. Photographer: Marcel Tanke. This is a nice find. There are not many white sponges and this reminds me of a species of thorectid sponge that Glossodoris sp.
If so, it will be a further confirmation that C. I will need to get the sponge identified. Dear Bill, We found this interesting Chromodoris annae feeding on a brown sponge.
Its mantle is split into 2 full rings. So I suppose it is a developmental abnormality. Locality: Anilao, meters, Philippines, 13 July Length: 4 cm. It is an interesting find, and I would agree that it a developmental abnormality.
I apologize if I've already sent you this one. I was looking through my pics from Vietnam and haven't been able to ID this nudi. Your thoughts? Photographer: Mike Krampf. Dear Mike, I am beginning to wonder if the South China Sea region is one of those geographic regions which have a particular colour pattern, likre the red-spotted chromodorids in south-eastern Australia and the 'blue chromodorids' of the Mediterranean.
In the South China Sea there seem to be quite few species with multiple black lines. I think the clue to its identity is the punctate colour pattern on the mantle - that is the scattering of small darker pits all over the blue region. A number of similarly coloured species have this punctate pattern including C.
I am beginnng to wonder if they are all colour variants of one species. Certainly C. I think at this stage I will consider your animal to be a variant of C. While I am travelling, perhaps you could see if you have other photos which might linke this animal with these other species.
For example see messages , , Best wishes, Bill Rudman. Hello Bill! Found this nudi perching on what seem like a sponge coral or ascidian. Not sure if the nudi is eating it or not because when I found it, it was very still Maybe sleeping?
Locality: Mabul Is. Muck diving.. Photographer: Asther M. Please help me confirm is this is a color variation of Chromodoris magnifica. Dear Asther, This is Chromodoris annae. If you look carefully at the blue part of the volour pattern you will see it is not a uniform colour but has many darker blue specks - which we call a punctate pattern.
This is one obvious way that C. The animal in your photo. Unless it is being very adventurous, I sure it won't be eating it. Chromodorids are very specialised sponge feeders. Following the other two feeding examples I sent recently, here is another which might be of interest. This one is of a Chromodoris annae tucking into a white sponge which was quite firm but elastic to the touch. The C. Unfortunately I couldn't get in that close to get a good clear close-up as it was tucked away upside down under an overhang.
Depth: 49 ft. Length: 25 mm. Photographer: Lindsay Warren. Other than the sponge, another interesting thing about this C. Similar to the one found when Bernard Picton was on Pulau Hoga in which you have posted on the Forum. Incidentally, it is interesting to know the origin of 'fundi' [message ]- just an expression I picked up on trips to South Africa!
Perhaps your sponge 'fundi' will know which sponge this C. Dear Lindsay, Another interesting observation. It looks like a species of Darwinella , but I will check it out.
Inset showing dark pitted surface in blue areas of mantle. E Picton. This is another of the Chromodoris quadricolor colour group of species characterised by black longitudinal lines, bluish backgrounds and orange borders. This species has similarities to Chromodoris elisabethina but C. The only other chromodorid with similar pitted blue regions is Chromodoris westraliensis. The animals illustrated here show the colour range within the species.
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