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Ghianis D wreck, Egypt. Photo by Stephane Rochon.

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Big eye, Philippines. Photo by Stephane Rochon.

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Best videos

Music: Blank and Jones "Beyond Time" 07:36

Cala Gran
Spain

10:05

Angarosh Reef
Sudan

Stiliger sp.. A new species of sea slug?

I was in the Lembeh Strait in Indonesia recently, shooting macro video of tiny skeleton shrimps on a green algae stalk, when my dive guide Mamang and I noticed a small sea slug next to them.

This is a sacoglossan, a herbivorous animal commonly known as a sap-sucking slug. It pierces the algae and sucks out the sap from the cells.

Those large, clear appendages on the back are called the cerata, or kerata, and the green ducts are branches of its digestive gland. If you look closely you can see material travelling up and down those green ducts.

It's possible this is a solar-powered slug. Some sacoglossans keep chloroplasts from the algae alive in their body, where they continue to photosynthesize the sun's energy into sugars, a phenomenon known as kleptoplasty.

On the head you can see two black primitive eye spots, and a long pair of sensory stalks known as rhinophores. It looks like it's lost part of one of them. You can even see branches of the digestive gland in the head.

At first I expected this would be a known species of sea slug, but I've been unable to find any match, and I'm now told that it's probably a new species in the Stiliger genus. There are a few other species of Stiliger that have been observed in the field but not described and named.

It wouldn't be possible for scientists to officially designate this as a new species without examining samples. The form of the radular teeth for example is important in differentiating between species, and DNA testing is becoming increasingly important.

This specimen was at the dive site Jahir at a depth of 10 metres. It was just a few millimetres long. I'd love to hear from you if you believe this is a known species.

I shot this footage at while diving with YOS Dive Lembeh - Eco Beach Resort (http://yosdivelembeh.com/). Thanks to my dive guide and critter spotter Mamang.

The video was shot by Nick Hope with a Panasonic GH4 in a Nauticam NA-GH4 housing. I used an Olympus M.Zuiko ED 60mm f2.8 macro lens and a Nauticam CMC.

I have more scuba diving videos and underwater footage on my website at:
http://www.bubblevision.com

I post updates about my videos here:
http://www.facebook.com/bubblevision
http://google.com/+bubblevision
http://www.twitter.com/nicholashope
http://bubblevision.tumblr.com 02:50

Jahir
Indonesia

04:45

Jellyfish Lake
Republic of Palau


Best photos

scuba diving photo

Turtle Rock
Colombia

scuba diving photo

Coral Beach
Israel


  What's up

  • Oct 16 
    [ Dive site ] Viking Cave Thailand, Andaman Sea, Koh Phi Phi
  • Oct 16 
    [ Dive site ] Om Halhalla Egypt, Marsa Alam
  • Oct 16 
    [ Dive site ] Tauchplatz Alte Donau Austria, Wien
  • Oct 16 
    [ Dive site ] Arakababesang Island Palau
  • Oct 16 
    [ Dive site ] Ras Nasrani Egypt, Sharm el Sheikh
  • Oct 16 
    [ Dive site ] Soto Trader Wreck Cayman, Little Cayman
  • Oct 16 
    [ Dive site ] HMCS Saskatchewan Canada, British Columbia, Vancouver Island
  • Oct 16 
    [ Dive site ] Los Islotes Mexico, Baja California, La Paz Isla Partida
  • Oct 16 
    [ Dive site ] Dolini Roncsok Croatia, North adriatic, Rab
  • Oct 16 
    [ Dive site ] The Paquita Wreck South Africa, Western Cape, Knysna
  • Oct 16 
    [ Dive site ] Sea Star II Wreck Bahamas, Grand Bahama
  • Oct 16 
    [ Photo ] Kudah Rah Thila Maldives, Ari, South Ari Atoll.
  • Oct 16 
    [ Dive site ] Sha'ab Sabina Egypt, Hurghada
  • Oct 16 
    [ Dive site ] Erg Sabina Egypt, Hurghada
  • Oct 16 
    [ Dive site ] Finger Point Maldives, Male Atoll, North Male Atoll
  • Oct 16 
    [ Dive site ] Barracuda point Maldives, Male Atoll, North Male Atoll
  • Oct 16 
    [ Dive site ] Bat reef Maldives, Male Atoll, North Male Atoll
  • Oct 16 
    [ Dive site ] Lucky rock Maldives, Male Atoll, North Male Atoll
  • Oct 15 
    [ Dive site ] Bajo de la Morra Spain, Costa Calida, La Manga
  • Oct 15 
    [ Dive site ] Proco 1 Indonesia, Maluku Islands
  • Oct 15 
    [ Dive site ] Proco 2 Indonesia, Maluku Islands
  • Oct 15 
    [ Dive site ] Proco Island North Indonesia, Maluku Islands
  • Oct 15 
    [ Dive site ] Tanjung Duva Duva Indonesia, Maluku Islands
  • Oct 15 
    [ Dive site ] Nanas island Indonesia, Maluku Islands
  • Oct 15 
    [ Dive site ] Tanjung Dehibira Indonesia, Maluku Islands

  New site infos

  • Jan 25 
    [ Info ] Secured navigation Wannadive is now only available thru secured (SSL/HTTPs) navigation. Feel free to report any bugs or wired behavior while browsing/contributing to the dive site atlas and/or thru the Android application.
  • Jul 08 
    [ Info ] Phishing pages Hackers succeeded into injecting some scripts into our server file system; mainly phishing pages (fake Dropbox and/or Email client login page; asking you to login with your Gmail/Yahoo account). We are pretty sure these phishing pages were NOT linked/used within this website; probably used in phishing email campaigns. Your community information (email, password, personal information) from this website were not compromised; but if you have been redirected to these pages it is strongly recommended that you change your email password. Sorry for the inconvenience
  • Dec 20 
    [ Info ] Wannadive è avaiable in italiano! Hi, Wannadive è avaiable in italiano! Today we are very happy to announce that Wannadive interface is available in Italian. We would like to thanks the following translators for their help and great Christmas gift! * Dave Noise (from Wannasurf) * Riccardo Ghetti (from Wannadive) * Lorenzo Facchin (from Wannadive) All Italian divers can now switch to Italian language by using the language selector at the top of Wannadive pages. Enjoy! We wish you a merry Christmas. WD Team

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