Dermatobranchus sp.

Image courtesy of Lindsay Warren
Kalabahi Bay, Pulau Alor, East Nusa Tenggara, Indonesia
Photo taken using a Nikon D300s with a 105 mm lens in an Aquatica housing plus
a Macromate 2:1 wet diopter and with 1 x Inon Z-240 strobe
Length: 15-30 mm, Depth: 4-10 m

This species of Dermatobranchus seems to be undescribed and to have only been found, so far, in Kalabahi Bay, Pulau Alor, East Nusa Tenggara, Indonesia. With similar mantle ridges giving a feather or leaf-like appearance it does have a passing resemblance to Dermatobranchus diagonalis Gosliner & Fahey, 2011 but there the similarities end.

The mantle seems relatively thin when compared to other species of Dermatobranchus. The underlying colour of the mantle is pale rufous beige with a darker area medially starting behind the rhinophores. On the mantle are widely spaced ridges which start from the medial line of the body and separate out further as they run to the mantle edge - the overall appearance is reminiscent of a feather or leaf. One central ridge starts between the rhinophores where the mantle edge blends into the head. Along each narrow ridge is a dark broken line and small speckles of white. The mantle edge is of a similar thickness and colour to the ridges and in some specimens has tinges of green. The elongate rhinophores are close together behind the oral veil, just in front of the beginning of the mantle; the rhinophore stalks are white with a thin yellow line down the posterior face; the vertically laminate slightly bulbous clubs have three bands - dark brown - cream - dark brown with white-tipped apices; the lamellae are edged in white. The foot does not extend beyond the mantle edge; the sides of the foot are white and covered in tiny dots of purple/red creating an overall pink tone and the edge features a thin yellow line; the oral veil has a denser covering of purple/red spots with yellow edge.

Species measured were found at night on or close to Clavularia sp. soft coral.

Lindsay Warren
Bali, Indonesia
Jan., 2018
Send Lindsay email at

Photo by Iain Fraser

As regulars to the Slug Site will already know from seeing her previous contributions, Lindsay's fascination with all things aquatic began as a small child and this has carried on throughout her life. However, it was only when at university that she discovered that diving was not just the prerogative of the elite. Beginning in 1974 with her first OW dive in 1975 near Marseilles, France, she noted in her logbook finding a nudibranch but had no idea what it was at the time. However many years later she was happily able to identify it.

On the photographic front, the only reason she ever took it up was purely to document what she saw when diving. She started with a second-hand Nikonos II, then a Nikonos III and later progressed to a Nikon F3 in an Aquatica housing. However, she became an accomplished photographer of land & air wildlife as well as human life events, capturing special moments. And yet still her first love remains with molluscs.

Having dived in many areas of the world including the UK, the Mediterranean, (Spain, France, Corsica), Red Sea (Israel & Egypt), Bahamas, USA (Florida, California, Hawaii), St Lucia, Montserrat, South Africa, Madagascar, Brazil, Fiji, Tonga, French Polynesia, the Tukang Besi Archipelago (SE Sulawesi, Indonesia), Lindsay now spends most of her time in Indonesia diving in places such as Bali, Alor, Lembeh as well as Sangeang, Komodo, Flores, Sumbawa, but also in the species rich Philippines.

As some of you probably already know, Lindsay spent several seasons in the mid 1990s to 2000 in the Wakatobi National Park islands (Tukang Besi Archipelago, SE Sulawesi, Indonesia) with Operation Wallacea. I am sure it is there that she perfected her technique of non-invasive underwater photography, something I will never master. Lindsay is able to photograph with a 105 mm lens and Macromate wet diopter while hovering about the subject without actually settling down on the seascape. Once more, she is able to do this with macro and super macro subjects. The results are amazing as the reader can see.

Lindsay was a prolific contributor to Bill Rudman's Sea Slug Forum when it was still an active site but she continues to look for and photograph opisthobranchs of all kinds sharing her finds with us via facebook, contributions to ebooks and id apps as well as direct with taxonomists around the world.

Michael Miller
San Diego, Calif
Jan., 2018
Send Mike email at

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