Trinchesia sp.
Image courtesy of Jim Anderson
China Strait, Milne Bay, PNG

We found these in Nov/Dec 2017 and 2019 at the same channel but separate sites around 15 metres. They are approx. 5 mm long. On both occasions we found these two colour variations together but also single black and orange specimens on hydroids or below on the substrate. We are not 100% convinced they are the same species or even that they are Trinchesia/Tenellia (maybe Eubranchus?). The black specimens vary in body colour with some having a white body with black pigment patches while others were dark. The orange specimens were more consistent with opaque white body with orange pigment patches.

So far we have found 14 undescribed and not similar to NSSI 2 species in the Milne Bay area - 11 are included in 'Milne Bay Nudibranchs Vol: 2'.

For an overview of my present camera equipment and in the past, please go to camera gear .

Jim Anderson
Linlithgow, Scotland
Aug. 2022
Send Jim email at

Hi Nudibranch fans,

We have just published 2 splendid volumes with over 480 species in each.
Links to the available book stores are below

Apple iBooks Vol: 1
Apple iBooks Vol: 2
Kindle - Vol: 1
Kindle - Vol: 2

Jim Anderson

WEBMASTER'S NOTES: Jim's Milne Bay offering certainly belongs in your library of nudibranch ID compendia! The photography is spectacular with the added bonus of updated taxonomic placements!

An architect who retired from practice in 2011, Jim Anderson is fascinated by the incredibly colourful world that lies just a short distance from the shore around the coast of his home in Scotland. He learned to dive there and very quickly discovered the diversity and extravagance of life that the grey sea does well to disguise. Photography started as a means of recording these sights - to try in some way to let others into this wonderful new world that was opening up.

He commenced diving in 1987 and has recorded over 5000 dives, over 2400 around Scotland, mostly with a camera in hand and has developed special skills in capturing images that have been widely published in national diving publications and identification guides. He is the proprietor of the portal to his extensive nudibranch and other web sites covering his home country and the destinations he has visited in the Philippines, Indonesia, Maldives, Red Sea, Kenya, Ireland and in the Caribbean. He is a 1st Class Examiner with the Scottish Sub Aqua Club and delivers Nudibranch Identification courses on behalf of the UK Marine Conservation Society." Jim also has several e-book identification guides available at a very reasonable price! Check it out!

Send Jim mail at

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