Clownfish, Philippines. Photo by Stephane Rochon.

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Molluscs (mollusks, Mollusca) including cowries, sea slugs (in particular, nudibranchs) and giant clams. Part 14 of my DVD, "Reef Life of the Andaman", available at

The first category of molluscs we look at is cowries in the family Cypraeidae, which is in the class gastropods (Gastropoda). Cowries have a pretty, glossy shell which can be covered by their bilobed mantle. The mole cowry (Talparia talpa) and tiger cowrie (Cypraea tigris) are two common species that feature from the Mergui Archipelago in Burma (Myanmar).

We then take a look at some of the sea slugs (opisthobranchs, Opisthobranchia) to be found in the Andaman Sea. The area has many pretty nudibranchs (Nudibranchia) and amongst others we find a Chromodoris geminus at Richelieu Rock, north of the Similan Islands in Thailand, and a group of 3 Chromodoris annulata at Black Rock in the Mergui Archipelago. Wart slugs in the family Phyllidiidae are also represented, particularly those of the Phyllidia genus such as Phyllidia varicosa.

Finally we take a look at the fluted giant clam, Trdacna squamosa, which is a large bivalve (bivalvia) found on many Thailand dive sites.

The full narration is available as English, German or Spanish subtitles by turning on the closed captions (CC). There are also closed captions available showing scientific and common names of the molluscs in English, German or Dutch, along with dive site names.

Thanks to Mark Ellison for the first music track, "Hidden Depths", and to Kevin MacCleod ( for the second music track, "Deliberate Thought".

"Reef Life of the Andaman" is being serialised weekly on YouTube. Please subscribe to my channel to receive notifications of new episodes as I release them. The series features descriptions of 213 different marine species including more than 100 tropical fish, along with sharks, rays, moray eels, crabs, lobsters, shrimps, sea slugs, cuttlefish, squid, octopus, turtles, sea snakes, starfish, sea cucumbers, corals, worms etc..

I have more scuba diving videos and underwater footage on my website at:

I post updates about my videos, and interesting underwater videos from other filmmakers here:

The video was shot by Nick Hope with a Sony VX2000 DV camera in a Gates housing. It was edited in Sony Vegas Pro then deinterlaced with QTGMC and upscaled to 720p HD in AviSynth.

Thanks to Santana Diving of Phuket (, to Elfi and Uli Erfort for help with the German translation, and to Frank Nelissen for the Dutch subtitles.

Full list of molluscs and dive sites featured in this video:

00:00 Red-Legged Swimming Crab, Portunus (Portunus) convexus, Nurse Bank
00:05 Mole Cowry, Talparia talpa, Western Rocky Island
00:47 Tiger Cowrie, Cypraea tigris, Shark Cave
00:56 Tiger Cowrie, Cypraea tigris, Pinnacle Arch
01:06 Arabian Cowrie, Mauritia arabica, Moving Wall
01:37 Black-Margined Glossodoris, Glossodoris atromarginata, King Cruiser
01:42 Strickland's Halgerda, Halgerda stricklandi, Shark Cave
01:47 Ornate Sap-Sucking Slug, Elysia ornata, Staghorn Reef, Black Rock
01:54 Twin Chromodoris, Chromodoris geminus, Richelieu Rock
02:00 Girdled Glossodoris, Glossodoris cincta, Shark Cave
02:05 Ringed Chromodoris, Chromodoris annulata, Black Rock
02:15 Ridged Dermatobranchus, Dermatobranchus gonatophorus, Richelieu Rock
02:21 Indian Phidiana, Phidiana indica, Black Rock
02:32 Beautiful Risbecia, Risbecia pulchella, Black Rock
02:46 Ringed Chromodoris, Chromodoris annulata, Black Rock
02:51 Hikueru Glossodoris, Glossodoris hikuerensis, Western Rocky Island
02:55 Spanish Dancer Egg Mass, Koh Tachai
02:59 Nudibranch Egg Mass, Fan Forest Pinnacle
03:04 Gemma's Phyllidiopsis, Phyllidiopsis gemmata, Staghorn Reef, Racha Yai
03:08 Krempf's Phyllidiopsis, Phyllidiopsis krempfi, Banana Bay, Racha Noi
03:12 Black Phyllidiella, Phyllidiella nigra, Shark Cave
03:16 Pustulose Phyllidiella, Phyllidiella pustulosa, Shark Point
03:20 Pustulose Phyllidiella, Phyllidiella pustulosa, Koh Ha
03:24 Ocellate Phyllidia, Phyllidia ocellata, Staghorn Reef, Racha Yai
03:29 Ocellate Phyllidia, Phyllidia ocellata, Phi Phi Island
03:33 Varicose Phyllidia, Phyllidia varicosa, Black Rock
03:37 Varicose Phyllidia, Phyllidia varicosa, Rocky Point
03:42 Varicose Phyllidia, Phyllidia varicosa, Angel's Finger
03:47 Fluted Giant Clam, Tridacna squamosa, Home Run, Racha Yai
03:56 Fluted Giant Clam, Tridacna squamosa, South Reef, Racha Noi
04:10 Fluted Giant Clam, Tridacna squamosa, Snapper Alley, Similans
04:25 Tuna Wreck, Similans 04:54

Black Rock


Sveta Marina Wall

Moray eels in the Hurghada Area (Carless Reef and Umm Gamar)
Interviewer : Pierre  Music : Amon Tobin, "Sordid" Filmed in summer 2007 with a sony HC44 in a Nimar housing. Wide angle, red filter, no artificial light. 03:36

Carless Reef


Althäuser See

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