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Favorinus japonicus

Baba, 1949


Connie Chen ID please....

James Loyola are those eggs of another nudi in between the egg ribbon?

揭維邦 Favorinus japonicus

Mike Bartick such a beautiful Nudi!...probably feeding on the top eggs...maybe i should come to taiwan huh...for a couple days...?

Gary Cobb This egg eating nudibranch is Favorinus japonicus Bab, 1949 the colour of the cerata is dictated by the colour of the eggs it eat.

Gary Cobb Yes that small egg mass is that of this species.

Patrik Good Gold Coast Seaway (Australia); Favorinus japonicus; 19/4/2013; nightdive; size 9mm fully stretched; depth 2 metres; 24 degrees water temperature; 2 metres visibility. Favorinus japonicus was - along with Gymnodoris - a surprise find for the Seaway two weeks ago. I think they are feeding on nudi spawn and there didn't seem too many nudis around yet. I have found a big 22mm, fully grown, shining red adult F. japonicus on the same dive. They are just outstandingly beautiful and it presented itself like an oasis in the desert, sitting in the middle of an algae overgrown rock, wiggling along. So surprising that fish can resist a temptation like that. A bit later I found this totally white critter, only 9mm fully extended. I couldn't ID it under water and was surprised that it might actually be F. japonicus when I took photos. I know that this species has a few colour variations. Based on size I assume this one is a juvenile (that's at least what I hear all the time about my tiny critters). So, my question to the experts would be if juvenile always come in white. I like this side view showing some interesting features but am happy to upload the top view too.

Patrik Good Chelidonura fulvipuctata, size 15mm, depth 3 metres, nightdive Seaway SW Wall, 7/4/2012 on Padina gymnospora. It looked like the Chelidonura was eating the padina as it crawled over the edge several times. The Seaway has some opisthobranch life again after all. Chelidonura's are abundant at the moment. A new species for the dive site was found, to my surprise a nudi spawn eating species and certainly one of the most beautiful species I have ever encountered: Favorinus japonicus in a nice red colour form.

Alvaro Borba Hi Patrik Good you always find this species over Padina? Or you look at specific times? For example sunrise or sunset. Thanks

Patrik Good The Ch. fulvipunctata we have found at the Seaway are normally on the ground and not on the Padina. Happy to be corrected if I am wrong. This individual showed an unusual behaviour as it crawled quite quickly from the front to the back of the Padina, then to the front and back again. I don't think it was fleeing my torch light. Although it might appear that the Ch. fulvipunctata had eaten a big chunk out of the Padina I think the eating mark is from a different critter. Maybe there was an interesting smell or even some spawn or other food on the Padina, especially the Padina bite mark. This individual - one of countless Ch. fulvipunctatas that night - was a only about 15mm where as some got up to 40mm. This guy's colouration is also slightly brighter than that of other and bigger ones. Your second question, Alvaro Borba: I think all of the Chelidonura we normally find were on night dives. We find a few Aglajidae members here, and the one's I remember out of my head right now were night time finds. If this is of a particular interest to you I can doublecheck in my records. I can say little about sunrise dives. Most nudis we find on full moon nights, but there are also some species that we find mainly during the day and some both during the day and at night. Sunset in my experience is not as good as early to middle of the night (night nudis are not out yet, and day nudis disappearing). But that might probably vary with time zone and hemisphere that you are living in. Having said that most of our dives used to be happening around high tide and a factor to consider also is that Seaway at the moment is finding it's equilibrium again after a rough time, with most food sources and nudis vanished for weeks and weeks, only starting to come back now after the flooding in January. Sorry it's probably not the Padina that you have to look out in order to find the Chelidonura but you might be lucky. Padinas host other spectacular nudis too.

Alvaro Borba Wonder! That's what I wanted to know. Actually this species must be more active at night then. A long time I am looking for individuals of Aglajidae but still could not find them. Will increase the night dives to try to observe them. Best regards

Patrik Good Favorinus japonicus, Southport Seaway Nightdive, 7/4/2012, size 15mm, depth 3 metres, visibility 15 metres. Found two individuals in two different locations. They are eating nudi spawn (not sure if the ball to the left is nudi spawn). Maybe an explanation why the population of the Goniodoridella sp. 1 has declined and there are only a few individuals to be found? Chelidonura fulvipunctata is abundant at the moment, in different sizes and mating. Also, Plocamopherus ceylonicus seems quite abundant.

Deb Aston Okenia pellucida Burn, 1967 - No 99 for the Gold Coast

Patrik Good Congrats. That was quick. How big?

Deb Aston 10mm, at 3m depth. Do you have no 100?

Patrik Good I have two that I can't ID.

Deb Aston 100 & 101?

Patrik Good Nope, don't think so. Probably just strange looking Favorinus japonicus and Plocamopherus ceylonicus or imperialis. Can you doublecheck please?

Patrik Good 12/5/2012 Nightdive Southport Seaway, 3 metres, 23 degree, size about 10mm. Is this Noumea simplex? Am a bit confused with the yellow border. Found one similar on nudibranch.com.au but would appreciate a confirmation or the proper ID.

Deb Aston Looks like Noumea simplex to me.

Gary Cobb I would say this very well could be Glossodoris carlsoni Rudman, 1986

Patrik Good Thanks, Deb.

Patrik Good Hmm, need to investigate then as it might be No. 99 for the Seaway if I am not mistaken. Thanks, Gary.

Gary Cobb Nice work!

Patrik Good Due to the lack of regular white specks in the mantle (and of me collecting this critter) we have decided that the hunt for No. 99 is still open at the Seaway.

Patrik Good 6 Opisthobranchs found that dive: Chromodoris cf. reticulata (1), Hydatina physis (3), Glossodoris carlsoni without official status (1), Discodoris palma (2), Goniodoridella sp. 1 (1), Favorinus japonicus (1). The beautiful nudi spawn eating Favorinus japonicus looked very healthy, big and was crawling fast. Didn't find the usual abundancy of Goniodoridellas.

Taxonomy
Animalia (Kingdom)
  Mollusca (Phylum)
    Gastropoda (Class)
      Heterobranchia (Subclass)
        Opisthobranchia (Infraclass)
          Nudibranchia (Order)
            Dexiarchia (Suborder)
              Aeolidida (Infraorder)
                Aeolidioidea (Superfamily)
                  Facelinidae (Family)
                    Favorinus (Genus)
                      Favorinus japonicus (Species)
Associated Species