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Alcyonidium diaphanum

(Hudson, 1778)

Erling Svensen Just want to check out this bryozoa. I have a feeling that I know this one, but would like to confirm it. Do you know it?

Andrea Waeschenbach Hi Erling. Looks like an Alcyonidium to me. Possibly diaphanum, but Joanne Porter is the expert on these.

Joanne Porter Without a doubt Alcyonidium diaphanum Erling, with its lophophores out. Nice photo!

Abigail Smith What a lovely photo!

Message posted on NE Atlantic Bryozoa on 12 Apr 2012
Chris Newton I feel I should know but can someone confirm what this is?

Wendy Northway finger bryozoan - alcyonidium diaphanum

Nicola Faulks Aye, that it is, there were loads of them on the second dive on Saturday. The give away is the light fuzz around the finger, which your photo has captured well.

Chris Newton thanks both

Message posted on Seasearch North East England on 05 Aug 2013
David Kipling Adult Goniodoris nodosa eating a Dendrodoa grossularia in Pembrokeshire. I'm used to seeing juveniles on the finger bryozoan Alcyonidium diaphanum, so it is nice to see one having moved on to "adult food" ;)

Kate Lock I am assuming this was also Linney Head??

David Kipling Yes, taken a few minutes before the Aegires. Habitas has them down as eating Dendrodoa.

Message posted on NE Atlantic Nudibranchs on 15 May 2012
Liz Morris Does anyone know, does Axinella dissimilis always have stellate grooves around the oscules? I looked and looked on the few potentials this weekend, and couldnt find any, but have no idea what this could be confused with. Any ideas?

Liz Morris sorry, I forgot the please word! I'd be most grateful as Seasearchers have been asking me. Thank you!

Jennifer Jones Hi Liz, it is Axinella dissimilis. If you look at the bunch of 'fingers' with the silt at the base, the oscule at the end of the right hand finger has grooves radiating out from it giving it a stellate appearance. It's not that the sponge has star shapes around the oscule as such. Hope that makes sense.

Liz Morris right, that clarifies things. But I still couldnt see many radiating grooves. I'm pleased that it is though, as was wondering if the records were correct!! Are the grooves to channel silt from the oscules or something? Thanks!

Claire Goodwin I think the colour (very bright yellow rather than brownish) and the smooth, velvety, non-silty texture might be more useful characters for Seasearchers. Had someone identify Alcyonidium diaphanum as this on our course this weekend though so it does make you wonder!

Bernard Picton The stellate grooves only become really apparent when the sponge is taken out of water. They are really exhalent channels which converge on the oscules and are roofed over by a thin layer of tissue when the sponge is pumping.

Message posted on NE Atlantic Porifera on 30 Jul 2012
Tony Gilbert Interesting colouration of Acanthodoris pilosa, usually white, this is the first brown/mixed one I've seen, and has white gills. Found this on Bryozoan: Alcyonidium diaphanum (thanks Jo). https://www.facebook.com/media/set/?set=a.173485702785521.38902.100003722780643&type=1#!/photo.php?fbid=190530867747671&set=a.173485702785521.38902.100003722780643&type=3&theater

Ian Smith That's a beauty!

Arne Kuilman Nice rhino's!

Tony Gilbert Thanks. And the A. pilosa next door was white, on the same bryo.

Message posted on NE Atlantic Nudibranchs on 22 Sep 2012
Paula Young Help, help? Any ideas? This was taken a couple of miles west of Dover, about 18m. Initial thought was a squirt of some sort (comments from Mr Kipling, Becky Hitchin welcome).....possibly Didemnum maculosum...but I'm not entirely convinced and am just not that good with blobby masses??

David Kipling Looks like star shaped holes, so squirt with closed siphons would be good start. But in the back some look to be raising themselves up a little, and actually I can't see inside any of the holes. I've been caught withnthi

David Kipling ... With this one before with and intertidal "squirt".

Paula Young Another thought - There were lots of Alcyonium d. around, and I did come across one earlier in the dive with nearly all the polyps retracted (got over excited and thought it was some interesting nudi at first, but no...). I just thought maybe this looked a bit too bumpy or irregular to be Alcyonium?

Becky Hitchin one or two of the polyps do look like they have 8-fold symmetry. but that's squinting very hard and hoping

Paula Young What's DMF...apart from something I can do a kitchen makeover with? Oh no...hang on!

David Kipling Alcyonidium digitatum, the finger dead man's finger ;)

David Kipling No I was making word play on finger bryozoan (Alcyonidium diaphanum versus Alcyonium digitatum).

Paula Young I think DMF it is then...there were loads around! Thanks all!

Message posted on Seasearch Identifications on 10 Jun 2013
Animalia (Kingdom)
  Bryozoa (Phylum)
    Gymnolaemata (Class)
      Ctenostomatida (Order)
        Alcyonidiidae (Family)
          Alcyonidium (Genus)
            Alcyonidium diaphanum (Species)
Associated Species