Ancula pacifica MacFarland, 1905

While putting together the new Nudibranchs and Sea Slugs of the Eastern Pacific, coauthor Karin Fletcher tripped over an interesting find - what we have been calling Ancula gibbosa isn't.

The following are excerpts from the new book. Nudibranchs and Sea Slugs of the Eastern Pacific which is available from Mola Marine at

This is how MacFarland described and illustrated it. No mention of white specks

Genetical analysis shows distinct separation between the animal here in the north Pacific and those in the north Atlantic. It also suggests 2 undescribed species.

The Barcode of Life Data System (BOLD) is an informatics workbench aiding the acquisition, storage, analysis and publication of DNA.)

Okay - that said - who are these guys? We won't know until we have completed genetic analysis.

This is the kind of science we need to truly understand the relationships of species.

Karin Fletcher
Rich Passage, Washington
August, 2022

Send Karin email at

Photo courtesy of Doug Miller

Karin Fletcher and her husband, Doug Miller, have been scuba diving in Puget Sound since 2006. In 2009, they moved to a house on Rich Passage near Bremerton, WA where they dive at least once a week, sometimes while dodging boat traffic. Karin has been tracking nudibranch abundance and diversity in Rich Passage since then and Doug tracks fish and invertebrates for

Karin uses an Olympus TG-5 in an Olympus housing.

Send Karin email at

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