Purple Octopus - using citizen science to discover marine interactions
This is the entity page showing aggregated messages and images for the named entity.


Tritonia hombergii

Cuvier, 1803


David Kipling This comes into the "cute" category as opposed to needing ID! Tritonia hombergii discussing housing issues with a painted top shell... Photo taken N Wales.

David Kipling For camera nerds, this is the new Olympus 60mm u4/3 macro lens on a Pen EPL-1 with a couple of Inon S2000 strobes. My first "grown up" lens and one I'm starting to rather like!

Richard Yorke Didn't I see you were using an Inon Wet Diopter as well.

David Kipling Nope - that was on Sarah's XZ-1 compact. I've tried the Inon on the 60mm but the shallow DOF is too much of a PITA for general use, especially for a macro lens newbie!

Message posted on NE Atlantic Nudibranchs on 18 Jun 2013
Erling Svensen I send in a picture from 16. of January. I saw this tiny litle nudy on a Alcyonium in Egersund harbour (South West Norway). Could it be a small Dentronotus frondosus, or what do you think? It was only 1,5 cm long.

David Kipling Baby Tritonia hombergii perhaps? Right food source.

Erling Svensen May be. I did not think of this one but I am quite sure this is correct.

Christian Skauge This looks like a Tritonia plebeia. You can tell them apart by the mouth part - T. hombergi has two broad veils, and not the tentacles dispolayed by the T. plebeia. Food is the same in both species - Alcyonium digitatum, dead men's fingers.

David Kipling Thanks Christian. I was looking at those distinct oral processes and it seemed a bit wrong for T. hombergii, didn't know about this other species.

Christian Skauge Although it is distibuted from western med to Norway, this a quite small (max 30mm) and inconspicuous species. Not many people see it at all, and when they do it is commonly percieved as a baby hombergi - have done it myself for years :-)

Bernard Picton I think young T. hombergi might have only a few tentacles on the oral veil. For me the colour of T. plebeia is quite different. http://www.habitas.org.uk/marinelife/species.asp?item=W12460

Marco Faasse Maybe Rob Maller has a photo of a white Tritinia plebeia from the Netherlands?

Message posted on NE Atlantic Nudibranchs on 03 Feb 2012
João Pedro Silva Lots of these eggs masses around today, mostly associated with Alcyonium glomeratum (I think...). Don't recall seeing them at this place before. Any idea on the "parents'" ID? Also found Tritonia hombergii for the first time today, rolling on the sandy bottom. No Alcyonium digitatum in sight, though.

Peter H van Bragt Where these spawn big and fat??? Could very well be T hombergii

João Pedro Silva Not sure how to handle "big" and "fat". They were rather big but the diameter was ~5-6cm. Some were slightly pink. http://www.flickr.com/photos/jpsilva1971/8448904534/ The single T. hombergii I found there was ~4-5cm long.

João Pedro Silva The size reminded me of the spawn of Dondice banyulensis but these are thinner and very different in shape: http://www.flickr.com/photos/jpsilva1971/5190093660

Peter H van Bragt Pink is often seen in T hombergii spawn. One can never be sure but it seems to be a candidate.

Jim Anderson These look like Tritonia hombergii spawn to me. I have a few examples here

Jim Anderson http://www.nudibranch.org/Scottish%20Nudibranchs/tritonia-hombergii.html

João Pedro Silva Thanks! I hope they're still around next week :)

Tony Gilbert Check out Tritonia plebia's spawn, if there are any piks for that. There maybe a subtle difference between the two. T. plebia likes A. digtatum, not so sure about A. glomeratum though.

Jim Anderson T. plebeia spawn is quite different and considerably smaller - see here http://www.nudibranch.org/Scottish%20Nudibranchs/html/tritonia-plebeia-spawn.html

Tony Gilbert Thanks Jim, always good to discount what is not.

Message posted on NE Atlantic Nudibranchs on 05 Feb 2013
Taxonomy
Animalia (Kingdom)
  Mollusca (Phylum)
    Gastropoda (Class)
      Heterobranchia (Subclass)
        Opisthobranchia (Infraclass)
          Nudibranchia (Order)
            Dexiarchia (Suborder)
              Dendronotida (Infraorder)
                Tritonioidea (Superfamily)
                  Tritoniidae (Family)
                    Tritonia (Genus)
                      Tritonia hombergii (Species)
Associated Species