Image courtesy of Jim Black
Goniobranchus lineolatus (van Hasselt, 1924)
Well this species is certainly a no brainer to identify. There is no other chromodorid that even comes close. Dark brown to black with closely spaced longitudinal white lines, hence the name "lineolatus." White specks occur on the rhinophores and gill. There is also an orange band on the notal margin.
In some specimens, like Jim's here, the white lines disappear leaving black regions on the dorsum.
This species ranges throughout the western Pacific where it feeds on Dysidea sponges. Jim adds that all of his observations of the species have been on fine, silt, muck bottoms.
Thanks for sharing Jim!
Jim on location at Anilao, Philippines, May 2013
Jim Black Retired from US Airways, and now after a merger, American Airlines with 37 years service as a pilot. Jim retired as Captain flying an A330 Airbus Internationally. Diving since 1970, with close to 8000 dives now. Currently shooting a NIkon D800E in a Subal Housing with Ikelite strobes.. Jim uses a Macro Mate, and a Nauticam SMC and its Multiplier for super macro work.
Jim's photography has been featured in a number of books and publications including Helmut Debelius' Nudibranchs and Sea Snails of Gosliner, Behrens and Williams Coral Reef Animals of the Indo-Pacific. A photo of Jim petting a shark in "Sleeping Shark Caves" off Isla Mujeres Island, Mexico, taken by Amy Foster his significant other, recently appeared in Dave Behrens' Diving Guide to Cozumel, Cancun & The Riviera Maja.
Jim has also been a major contributor to (1) the New Indo-Pacific Nudibranch and Sea Slug Identification book by Gosliner, Valdez, Behrens (NSSI),(2) Tropical Pacific Reef Creature Identification by Humann & DeLoach,(3) Nudibranchs Encyclopedia by Neville Coleman,(4) Reef Fishes of the East Indies by Gerald Allen and Mark Erdmann, And many other publications.
Jim has been a solid supporter of the Slug Site since day one. His countless contributions put him near the top of the list of photographers who have greatly expanded our knowledge of sea slugs. There are a lot of kids in the formative stage of their education who are getting their first introduction to our sea slug friends via the great photographs Jim and other contributors have made to the site. My hat is off to Jim for making this presentation possible!
Send Jim email at firstname.lastname@example.org