Purple Octopus - using citizen science to discover marine interactions
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Hypselodoris saintvincentius

Burn, 1962

Chandy de Wit Came across these three on a dive today, wondering if there is any possible explanation?

Rahul Meh-unpronouncable Hypselodoris infucata and what are the other two?

Chandy de Wit More interested in the behaviour? The others are Mexichromis macropus...

Rahul Meh-unpronouncable Initial guess would be communal feeding, though a simple explanation, there are so many nudis with such specific food sources that this behaviour would be interesting to see food preferance choicing over interspecies behavioural patterns.

Chandy de Wit Perfect explanation, though not sure the contact would be necessary since there was quite a large patch of the substance they were on?

Rahul Meh-unpronouncable Perhaps slime trails would answer that bit as nudi that prey on other nudis use slime trails to lead them to their prey, so perhaps though it isnt a predator prey interaction, the hypselodoris is still gaining some information from the slime trail of the others. That this is just a guess, it may explain the close proximity.

Chandy de Wit Makes sense :) so many questions with Nudibranchs :)

Gary Cobb Groupings happen with the same food source. The Hypselodoris is to be questioned! If the animal is fm Australian waters it won't be H. Infucata it would be H. obscura. And if the gills are triangular it would be H. kanga

Chris Cunnold Hi all, what 's the chance that the Hypselodoris is H.saintvincentius? As this is from West Australia.

Chandy de Wit Sorry it's from SW Western Australia, have been calling it Hypselodoris Saintvincentius ??? Though apparently that is questionable?

Chris Cunnold Really? I'm interested in this development, do you know where to point me for the info? I found this http://web.archive.org/web/20130123090304/http://www.seaslugforum.net/find/hypssain

Chandy de Wit I've been calling it Hyp. saintvincentius forever but it's in "Nudibranchs of the World"....

Chandy de Wit And the pic in Neville Coleman's Encyclopaedia doesn't look like it has any yellow spots, so I'm confused......

Sue Myburgh Good to see they are all coming back.

Gary Cobb Yes after a little closer look you may be right the left animal is Hypselodoris saintvincentius the body and rhinophores match, it would be mic to see the gills. Good catch Chris!

Chandy de Wit

Chandy de Wit Hypselodoris saintvincentius, funny, wasn't woundering this at all at the beginning of this post but when Rahul said infucata I found that I have three publications that are saying the same......

Rahul Meh-unpronouncable The degree of difference is often so minute, its hard to see where one species stops and another begins

Gary Cobb For one thing Hypselodoris saintvincentius has red gills with white specks.

Gary Cobb Here are the gill differences between 3 species that look very similar. Hypselodoris infucata has gills with an outer edge has that has one red line, H. kanga has gills are triangular in cross-section (the outer edge has two red lines) and H. saintvincentius has gills similar to H. infucata but with white specks.

Chris Cunnold That's great Gary , a definitive way to ID them, I'm going to have to go back over my images to check.

Gary Cobb Hypselodoris obscura has the single outer red line too BUT is only found on the east coast of Australia (endemic)

Chandy de Wit Thanks Gary Cobb, pretty sure I've only ever seen saintvincentius, the markings and colours of the others also seem quite distinctively different.

Gary Cobb You're quite welcome!

Michael Lee I'm thinking a Hypselodoris saintvincentius but given the brown colours I'm not so sure. It was about 2 - 3cm taken at the Grain Terminal Rockingham Perth WA. Canon G12, Recsea Housing 2 x INON D2000 strobes, 6 x Macro Wet Lens 1/250, f4.0, ISO 100

Chandy de Wit Nice pic Mick, funny I was about to put up the same Nudi earlier today....

Chris Cunnold Hypselodoris for sure but given Gary's info about gill colouring and shape I will leave it at that (because in this shot they appear to have a triangular cross-section like H.kanga o.O ) - Hypselodoris sp.

Gary Cobb This looks like to me to be a very interesting colour-form of Hypselodoris kanga. I can see characteristics of of that species but an unusual colouration. A very nice find. Without scientific study done we can only ID this with what knowledge we know. I have seen many species with all kinds of weird and unusual colour-forms that stray away from the norm. H. kanga is one of them. I think many things contribute to a species (Opisthobranch) colouration, food and stress are a couple. But what is its name? Can we say it is significantly different from the main stream species? If so we could call it Hypselodoris cf. kanga (resembles or looks like). Or is it completely different looking in which we should call it Hypselodoris sp. I think not. I am happy to call this H. kanga

Michael Lee I have called him Sluggy :-) ... Thanks Chris and Gary for a little more of a scientific and expert approach. These have been seen a few times at the Grain Terminal so would be interesting as to how large the colony is.

Chandy de Wit And @ Ammo Jetty...

Chris Cunnold Also at Elizabeth Reef, Cottesloe.

Gary Cobb Nice to see feedback from WA

Animalia (Kingdom)
  Mollusca (Phylum)
    Gastropoda (Class)
      Heterobranchia (Subclass)
        Opisthobranchia (Infraclass)
          Nudibranchia (Order)
            Euctenidiacea (Suborder)
              Doridacea (Infraorder)
                Doridoidea (Superfamily)
                  Chromodorididae (Family)
                    Hypselodoris (Genus)
                      Hypselodoris saintvincentius (Species)
Associated Species