Thuridilla lineolata (Bergh, 1905) [Elysia]

On a divesite called “Pier” at Siquijor Island was a large field of that algae, identified by Bill Rudman as Caulerpa racemosa (approx. 5 square meters) and I discovered first this egg mass (3), then I looked for its producer and found the Lobiger viridis (2). The other speciemen (1) was found during a nightdive (5) on a divesite called “Lighthouse” at Cabilao Island hidden in a different kind of algae.

There was no more power in the batteries of my camera so I piched up a branch of that algae and collected the sea-slug. To my surprise there were 2 specimens (4) in my vessel! I did the shot during the next dive at “Busstop”. When I disturbanced the larger animial it rapidly unrolled the parapodial tentacles to display bright colour patches. 

A picture of this and more informations on Lobiger viridis are at Bill Rudman’s Sea-Slug Forum!

Size:	depth:	date:	island:	village:	divesite:
12 mm	8 m	27 October 2005	Malapascua	Logon	Lighthouse, nightdive

Class:  GASTROPODA
Subclass:  OPISTHOBRANCHIA

Order:  CEPHALASPIDEA
Superfamily:  ACTEONOIDEA
Family:  Hydatinidae  Pilsbry, 1893
Genus: Hydatina Schumacher, 1817
Hydatina physis (Linnaeus, 1758) [Bulla]
Hydatina zonata (Solander in Lightfoot, 1786) [Bulla]
Genus: Micromelo Pilsbry, 1895
Micromelo undata  (Bruguière, 1792) [Bulla]
Superfamily:  BULLOIDEA
Family:  Bullidae  Lamarck, 1801
Genus: Bulla Linnaeus, 1758
Bulla ampulla  Linnaeus, 1758
Superfamily:  DIAPHANOIDEA
Family: Diaphanidae  Odhner, 1914
Genus: Colpodaspis Sars, M., 1870
Colpodaspis thompsoni  Brown, 1979
Superfamily:  HAMINOIDEA
Family: Haminoeidae  Pilsbry, 1895
Genus: Atys Montfort, 1810
Atys cylindrica (Helbling, 1779) [Bulla]
Atys naucum (Linnaeus, 1758) [Bulla]
Genus: Haminoea Turton & Kingston, 1830
Haminoea cymbalum (Quoy & Gaimard, 1833) [Bulla]
Haminoea ovalis  Pease, 1868
Genus: Liloa Pilsbry, 1921
Liloa sp. A  Genus: Pilsbry, 1921
Superfamily:  PHILINOIDEA
Family: Aglajidae  Pilsbry, 1895 (1847)