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Corallina officinalis

Linnaeus, 1758

Erling Svensen I have heard there is a polychaete that lives on the Corallina officinalis. Do any know the name?

Andrew Mackie Spirorbis corallinae de Silva & Knight-Jones, 1962 is mostly restricted to Corallina officinalis

Erling Svensen Yes, always something to look for, and much more to learn. It is so nice......

Cynthia D. Trowbridge it has narrow larval settlement specificity :-)

Message posted on Seasearch Identifications on 21 Jun 2012
Andy Horton Isopod to look out for, or not to overlook

David Fenwick Snr The D. magnitorata was found on the side of a small Corallina covered rock, approx. 25cm dia; in a middleshore rockpool at Chimney Rocks, Penzance, Cornwall. The site is just west of Jubillee Pool. I was informed about this species by David Holdich about 12 months ago, so it has been one I've been looking for. From Hayward and Ryland, adults live in Balanus crenatus, and juveniles can be found on Chrondus crispus and Corallina. So lots of suitable habitat for it in Mounts Bay. Apparently we're right on the edge of it's range; it's known from the Channel Islands, France, and all the way down the Atlantic coast to Africa.

Andy Horton http://www.aphotomarine.com/isopoda_dynamene_magnitorata.html At the time of writing, I am not sure of its size. Is it very small?

David Fenwick Snr Sorry Andy forgot to add that, it was about 6-7mm, books say 6mm; females are smaller.

David Fenwick Snr Having mentioned the site here, I would add that this is one of the best pooling sites in the area, with almost perfect access, it also has quite a diverse range of fauna ''and'' flora. It's therefore incredibly important that any rocks that are turned over are carefully put back the right way after. That said, it remains popular with local children, there are problems there but we continue to try and educate when we're down there. Cracking site for algae.

Andy Horton Perhaps (if you have time) it is worth a special web page? I have not visited it. On my list now, with Looe. I have been to Marazion but that is on the list to go there again. http://www.glaucus.org.uk/Rockpool.htm#Rockpooling%20Venues

Andy Horton There is a close species, the dull white Dynamene bidentata found amongst barnacles on the lower shore, mostly on the western coasts of the British Isles. Hayward (red book) page 68, this one mentioned only (2004).

David Fenwick Snr Yes we regularly find Dynamene bidentata on the middle and lowershore amongst wracks and in crevices close-by, adults are usually an olive-green colour but they can be marked white, juvenile females are usually white or a dull white as you say.

Jade Berman I think I have seen these before maybe even up here in Northern Ireland... thats not a confirmed sighting its more that I have seen similar and next time I will have a proper look!

Andy Horton Jade Berman: what beaches in Northern Ireland? Just curious on what beaches you visit?

Andy Horton The small olive green isopd seems familiar. I have just forgotten now.

Jade Berman I go allthe way around the coast but in particular I was surveying up around Rathilin Island at the time looking for invasives. We didn't record the isopods but I will check iwth some of the others over here if they have seen it

Andy Horton Jade Berman; what are your favourite spots? Have you been to Kinnagoe Bay (over the border in Donegal). We feature coasts on out Coastal Topography section of Torpedo. See also: http://www.facebook.com/groups/BritishCoast/ for general views of the coast although some views are slipping from the original idea to map the coast in pictures.

Andy Horton Rathlin Island: I have heard this is a good spot. I would like to more sometime.

Andy Horton Geography reminder to myself (and others): http://en.wikipedia.org/wiki/Rathlin_Island

Jade Berman It is a lovely spot with great diving, there is some stunning coastline generally up here in Northern Ireland

David Fenwick Snr Sadly I have to report the species in question here is Dyname bidentata as David Holdich has just revised his original opinion. The identity was made certain after I sent some of the Penzance examples to David for microscopic examination as I pointed out that there were a number of red / reddish Dynamene of similar markings in the area. David Holdich is sure that Malcolm Storey's find from Dorset is D. magnitorata so it is certainly here. David went on to say that the best place to look for the species is on the extreme lowershore on mainland Britain and amongst Corallina officinalis, Chrondus crispus or in channels of sponges; of course it's also possible to find D. bidentata in these habitats. At least I'll be able to use the images to be able to display how diverse D. bidentata is in colour and how it may at times be confused with D. magnitorata. Also sent to David was a stage 7 female D. bidentata that was extremely dark with fluorescent blue spots on its sides and top. The animal in the image above is of what is called a stage 8 male.

Stuart Pearce This species of fish is compulsory in algae shots Ron LOL, soon as you get focused, up he pops :D

Ron Silver Apparently so! :-D

Cameron Easton Corallina elongata maybe?

Stuart Pearce Either elongata or officinalis Cameron, we mainly get Corallina officinalis in the UK, but elongata is more abundant in the Med, apparently main difference is coarser articulations in officinalis :)

Tom Hobock Looks like bait fish to me Stuart,lol I better stop these smart a-- remarks before I'm thrown out.lol Seriously it's quite a handsome little guy great shot,exceptionally clear and crisp.I'm not familiar with this species only know that it's a great shot.Ron I'm as alway very impressed.The beauty of it is knowing you where not looking for it but it found you.Thats the best part of all. Tanks Tom

Message posted on The Global Diving Community on 23 Aug 2013
Plantae (Kingdom)
  Biliphyta (Subkingdom)
    Rhodophyta (Phylum)
      Eurhodophytina (Subphylum)
        Florideophyceae (Class)
          Corallinophycidae (Subclass)
            Corallinales (Order)
              Corallinaceae (Family)
                Corallinoideae (Subfamily)
                  Corallina (Genus)
                    Corallina officinalis (Species)
Associated Species