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Thuridilla gracilis

(Risbec, 1928)


Loren Mariani Nudi - Camiguin, Philippines

Sarah Williamson Thuridilla gracilis?

Lindz Warren Yes, T. gracilis

Christopher Thorn Solar-powered slug? Sand Island, Taiwan. 5 m. 10 mm.

Jeff Rosenfeld Thuridilla gracilis (Risbec, 1928) See http://www.nudipixel.net/photo/00015026/

Christopher Thorn thanks for the link

Wm.Allen Oikle

Ron Silver Slender Sapsucking Slug, Thuridilla gracilis

Message posted on Wetpixel Underwater Photography on 18 Nov 2013
Gary Cobb Photos and species list from our 2 dives yesterday. 38 Species found at Flinders Reef Moreton Island, 10m viz, beautiful diving day, no swell and no surge, 25C water temp. 1st dive/2nd dive. *most species found this outing. Aegires flores 1 Ardeadoris pullata /1 *Chromodoris elisabethina 2/8 Chromodoris kuiteri 1/1 Chromodoris lochi /1 Costasiella kuroshimae Cratena cf. affinis 1 Cratena simba 2 Dermatobranchus cf. primus /1 Dermatobranchus rodmani /2 Elysia cf. furvacauda /1 Found at 1m on the mooring rope! Flabellina bicolor 1 Flabellina sp. 1 5 Found at 5m on the mooring rope! Glossodoris cincta 1 Goniobranchus geometricus 1 Halgerda cf. willeyi 1 Halgerda sp. 1 1 Our 540th species! I have never seen this species, ever. Hypselodoris godeffroyana /1 Hypselodoris maculosa 1 Jorunna sp. 3 /1 Marianina rosea /1 Micromelo undata /1 Noumea simplex /1 Phyllidia elegans 1 Phyllidia ocellata 1 Phyllidia picta 1 Phyllidiella lizae /2 Phyllidiella pustulosa 1/2 Protaeolidiella juliae /2 Thorunna daniellae 1 Thuridilla carlsoni 7/1 Thuridilla gracilis 1/1 Thuridilla neona 1 Thuridilla splendens 1 Trinchesia ornata 1/4 Trinchesia ornata 3/2 Trinchesia sp. 16 /1 Our 539th species! Trinchesia sp. 6 /1

Gary Cobb Correction: Halgerda sp. 2 is correct.

Gary Cobb We had a surgy couple of dives at Flinders Reef Moreton Island yesterday and found 26 species. Here is David Mullins, me and Jo posing at the surface interval in our new H1 Hybrid Waterproof drysuits, very warm aboard Mischief.

Gary Cobb Here the list of species we found: Berthellina citrina Chromodoris aspersa Chromodoris elisabethina Chromodoris lochi Cratena lineata Cratena simba Chromodoris burni Costasiella kuroshimae Doriprismatica atromarginata Elysia sp. 1 Goniobranchus collingwoodi Goniobranchus cf. verrieri Goniodoridella sp. 2 Hypselodoris whitei Plocamopherus imperialis Phyllidiopsis burni Phyllidiella pustulosa Phyllidiella lizae Risbecia godeffroyana Roboastra gracilis Thuridilla livida Thuridilla neona Thuridilla carlsoni Thuridilla gracilis Thuridilla splendens Trinchesia sp. 8

Patrik Good Congrats, good work. The variety of Thuridilla is exciting. With a few of the species I was not sure if they have just changed their names or if I just haven't come across them yet (eg. had to look Dori-S-prismatica atromarginata up).

Gary Cobb Sorry these suits are D1 species not H1!

Gary Cobb Patrik where did you find the spelling with an 's'? I had a re-look at the paper and it is spelled Doriprismatica, -> no 's'. Thanks! Yes we find quite a few Thuridilla at Flinders Reef.

Jim Anderson Your new suits are the business - I've been diving in one for 10 months, even down to 6 deg C. Not a problem your likely to have.

Gary Cobb Patrik the spelling of Doriprismatica is correct according to the paper.

Gary Cobb Hey Jim so you have a Di Hybrid?? Nice work. I love the suit!

Patrik Good Sorry Gary Cobb. Here the link I got it from: http://clade.ansp.org/obis/search.php/3587

Gary Cobb Patrik I think this site is old. It is saying Dorisprismatica is a synonym.

Gary Cobb I have written to Richard to get verification.

Ashley Missen Is there an email version coming out

Gary Cobb See thread above!

Gary Cobb 27 species actually!

Jim Anderson On 22 May, the following paper was published: Yonow, N. Opisthobranchs from the western Indian Ocean, with descriptions of two new species and ten new records (Mollusca, Gastropoda). Zookeys 197: 1"129. The new species are Cyerce borbonica (Polybranchiidae) and Doriopsilla nigrocera (Dendrodorididae). There are several important name changes in this publication and they should be adopted henceforth as they are proposed formally with adequate justification: Philinopsis cyanea (Martens) becomes a junior synonym of Philinopsis speciosa Pilsbry, 1860; Dolabella gigas (Rang) becomes a junior synonym of Dolabella auricularia (Lightfoot, 1786); Stylocheilus striatus (Quoy & Gaimard, 1832) becomes, once more, a junior synonym of Stylocheilus longicauda (Quoy & Gaimard, 1824); Thuridilla bayeri Er. Marcus, 1965 and Thuridilla ratna Er. Marcus, 1965 both become junior synonyms of Thuridilla gracilis (Risbec, 1928); The correct original spelling of the species name for Thuridilla vatae is vataae, so it now becomes Thuridilla vataae (Risbec, 1928); Chromodoris cavae Eliot, 1904 is removed from synonymy under C. tennentana (Kelaart, 1859). Twenty species of Chromodorididae are included in this work under established genera. Since Yonow did not review genera in this work (except that for bullockii), my recommendation is that the changes in generic names suggested by R. Johnson & Gosliner (2012) for the chromodorids covered by Yonow be adopted even though Johnson & Gosliner predate Yonow’s by one month.

Jim Anderson The above courtesy of Dr. Richard Willan

Message posted on NE Atlantic Nudibranchs on 19 Jun 2012
Blogie Robillo Having a hard time determining its species: is it Thuridilla splendens or Thuridilla gracilis? Length abt 3cm; depth 23m @ San Juan Reef

Gary Cobb This is a colour form of Thuridilla gracilis. The Forum has photos of this colour form. T. gracilis usually has lines on the sides of the body where as T. splendens has spots and sometimes those spots inter twine with a reticulate pattern with larger blue spots. These guide lines are a general way to guess the difference between the two species. Having a look inside will determine species. How this helps! :)

Blogie Robillo Thanks for the helpful info, Gary, as always! :)

Gary Cobb You're very welcome Blogie! Nice hunting.

Jim Anderson On 22 May, the following paper was published: Yonow, N. Opisthobranchs from the western Indian Ocean, with descriptions of two new species and ten new records (Mollusca, Gastropoda). Zookeys 197: 1"129. The new species are Cyerce borbonica (Polybranchiidae) and Doriopsilla nigrocera (Dendrodorididae). There are several important name changes in this publication and they should be adopted henceforth as they are proposed formally with adequate justification: Philinopsis cyanea (Martens) becomes a junior synonym of Philinopsis speciosa Pilsbry, 1860; Dolabella gigas (Rang) becomes a junior synonym of Dolabella auricularia (Lightfoot, 1786); Stylocheilus striatus (Quoy & Gaimard, 1832) becomes, once more, a junior synonym of Stylocheilus longicauda (Quoy & Gaimard, 1824); Thuridilla bayeri Er. Marcus, 1965 and Thuridilla ratna Er. Marcus, 1965 both become junior synonyms of Thuridilla gracilis (Risbec, 1928); The correct original spelling of the species name for Thuridilla vatae is vataae, so it now becomes Thuridilla vataae (Risbec, 1928); Chromodoris cavae Eliot, 1904 is removed from synonymy under C. tennentana (Kelaart, 1859). Twenty species of Chromodorididae are included in this work under established genera. Since Yonow did not review genera in this work (except that for bullockii), my recommendation is that the changes in generic names suggested by R. Johnson & Gosliner (2012) for the chromodorids covered by Yonow be adopted even though Johnson & Gosliner predate Yonow’s by one month.

Jim Anderson The above courtesy of Dr. Richard Willan

Deb Aston Jim can you explain in laymans terms why the name changes, is it lumpers and splitters at work or is dna the key? I am struggling to get a handle on this all.

Jim Anderson #Deb. Aren't we all! It seems to me to be all part of life's gay pageant (that's gay in the happy/gleeful sense) - science at work - changes happen.

Deb Aston Wish they would focus on naming the unnamed branchs for a while and not changing the ones we have already.

Thomas Philipp Thuridilla gracilis Photo taken backn in 2008 on Bali / Tulamben Area with Canon Powershot A620

Ron Silver :-D

Message posted on NUDIBRANCH LOVERS on 03 Nov 2013
Jim Anderson On 22 May, the following paper was published: Yonow, N. Opisthobranchs from the western Indian Ocean, with descriptions of two new species and ten new records (Mollusca, Gastropoda). Zookeys 197: 1"129. The new species are Cyerce borbonica (Polybranchiidae) and Doriopsilla nigrocera (Dendrodorididae). There are several important name changes in this publication and they should be adopted henceforth as they are proposed formally with adequate justification: Philinopsis cyanea (Martens) becomes a junior synonym of Philinopsis speciosa Pilsbry, 1860; Dolabella gigas (Rang) becomes a junior synonym of Dolabella auricularia (Lightfoot, 1786); Stylocheilus striatus (Quoy & Gaimard, 1832) becomes, once more, a junior synonym of Stylocheilus longicauda (Quoy & Gaimard, 1824); Thuridilla bayeri Er. Marcus, 1965 and Thuridilla ratna Er. Marcus, 1965 both become junior synonyms of Thuridilla gracilis (Risbec, 1928); The correct original spelling of the species name for Thuridilla vatae is vataae, so it now becomes Thuridilla vataae (Risbec, 1928); Chromodoris cavae Eliot, 1904 is removed from synonymy under C. tennentana (Kelaart, 1859). Twenty species of Chromodorididae are included in this work under established genera. Since Yonow did not review genera in this work (except that for bullockii), my recommendation is that the changes in generic names suggested by R. Johnson & Gosliner (2012) for the chromodorids covered by Yonow be adopted even though Johnson & Gosliner predate Yonow’s by one month.

Jim Anderson Courtesy of Dr. Richard Willan

Message posted on NUDIBRANCH LOVERS on 19 Jun 2012
Jim Anderson On 22 May, the following paper was published: Yonow, N. Opisthobranchs from the western Indian Ocean, with descriptions of two new species and ten new records (Mollusca, Gastropoda). Zookeys 197: 1"129. The new species are Cyerce borbonica (Polybranchiidae) and Doriopsilla nigrocera (Dendrodorididae). There are several important name changes in this publication and they should be adopted henceforth as they are proposed formally with adequate justification: Philinopsis cyanea (Martens) becomes a junior synonym of Philinopsis speciosa Pilsbry, 1860; Dolabella gigas (Rang) becomes a junior synonym of Dolabella auricularia (Lightfoot, 1786); Stylocheilus striatus (Quoy & Gaimard, 1832) becomes, once more, a junior synonym of Stylocheilus longicauda (Quoy & Gaimard, 1824); Thuridilla bayeri Er. Marcus, 1965 and Thuridilla ratna Er. Marcus, 1965 both become junior synonyms of Thuridilla gracilis (Risbec, 1928); The correct original spelling of the species name for Thuridilla vatae is vataae, so it now becomes Thuridilla vataae (Risbec, 1928); Chromodoris cavae Eliot, 1904 is removed from synonymy under C. tennentana (Kelaart, 1859). Twenty species of Chromodorididae are included in this work under established genera. Since Yonow did not review genera in this work (except that for bullockii), my recommendation is that the changes in generic names suggested by R. Johnson & Gosliner (2012) for the chromodorids covered by Yonow be adopted even though Johnson & Gosliner predate Yonow’s by one month.

Jim Anderson Courtesy Dr. Richard Willan.

Erwin Koehler online at http://www.pensoft.net/journals/zookeys/issue/197/

Erwin Koehler please note the correct spelling is Cyerce bourbonica

Erwin Koehler Pictures of the new Cyerce bourbonica Yonow 2012 are online at the sea slug forum as Cyerce sp. 3 www.seaslugforum.net/find/cyersp3 and at http://seaslugs.free.fr/nudibranche/a_cyerce_sp3.htm or at http://www.umiushi.info/kanri/photo_sql_eng.php?act=PSP&gakumei1=Cyerce&gakumei2=sp.+3&location_code=0000

Message posted on EPAM Nudibranchs on 19 Jun 2012
Sylvie Omnès

Gary Cobb This is Thuridilla gracilis

Blogie Robillo Having a hard time determining its species: is it Thuridilla splendens or Thuridilla gracilis? Length abt 3cm; depth 23m @ San Juan Reef

Gary Cobb This is a colour form of Thuridilla gracilis. The Forum has photos of this colour form. T. gracilis usually has lines on the sides of the body where as T. splendens has spots and sometimes those spots inter twine with a reticulate pattern with larger blue spots. These guide lines are a general way to guess the difference between the two species. Having a look inside will determine species. How this helps! :)

Blogie Robillo Thanks for the helpful info, Gary, as always! :)

Gary Cobb You're very welcome Blogie! Nice hunting.

Timothy Nguyen Thuridilla splendens? Flinders Reef, Moreton Island @13m, 30-40mm https://www.facebook.com/photo.php?fbid=10150596096851334&set=a.10150596089821334.377975.562001333&type=3&theater

Gary Cobb Can't see the photo!:(

Timothy Nguyen Changed the privacy setting on the album Gary Cobb, can you see it now?

Patrik Good Yep and yep from me.

Gary Cobb Yes I can see the most common Species of Sacoglossan here. Thuridilla splendida (Baba, 1949)

Patrik Good Even if you spot 50 of them on a dive, still check them out as one of them might turn out to be a Thuridilla gracilis which I would like to see again soon.

Taxonomy
Animalia (Kingdom)
  Mollusca (Phylum)
    Gastropoda (Class)
      Heterobranchia (Subclass)
        Opisthobranchia (Infraclass)
          Sacoglossa (Order)
            Plakobranchacea (Suborder)
              Plakobranchoidea (Superfamily)
                Plakobranchidae (Family)
                  Thuridilla (Genus)
                    Thuridilla gracilis (Species)
Associated Species