היומן של anudibranchmom

You don't have to do anything! I changed it automatically for you based on range. ;-)

Catriona spadix is now its own species; it was most recently called the southern form of Catriona columbiana. A reproduction of the lovely 1905 color illustration by Olive MacFarland (finally published 61 years later, in 1966) of 'Cratena spadix' appears on the acknowledgments page of Behrens et al, "Nudibranchs and Sea Slugs of the Eastern Pacific," 2022. Photographs of both species are on page 146.

To quote Dave Behrens in a 2002 SlugSite post: "C. columbiana has had a bouncy taxonomic past."

Mercifully, it's relatively easy to distinguish these two species, both by appearance and range. Catriona spadix has red-orange oral tentacles, whereas Catriona columbiana has white oral tentacles. (Both have red-orange rhinophores.) Range also helps, although they may overlap in Oregon. Catriona columbiana occurs from the Sea of Japan to Alaska to Cape Arago, Oregon, and Catriona spadix occurs from Cape Arago, Oregon to San Diego, California.

Here's a link to the paper: https://onlinelibrary.wiley.com/doi/10.1111/eva.13468

Thank you @jeffgoddard for pointing out that WoRMS has accepted Ancula pacifica:

"I just noticed that WoRMS now accepts Ancula pacifica, following Behrens et al. (2022), who I know considered morphological and molecular genetic evidence, including Ian Smith's extensive account of A. gibbosa: https://www.flickr.com/photos/56388191@N08/51782089511. Ancula pacifica MacFarland, 1905 applies only to Ancula in the NE Pacific with three orange lines on the body between the rhinophores and gills, so this change on iNaturalist will not apply to all observations from the region currently referred to as A. gibbosa. Ancula pacifica usually ranges north to northern California, but in warm water years can be found as far north as Oregon and Washington, where it overlaps in distribution with A. gibbosa."

You may want to take a look at your Ancula observations to make sure they're IDd correctly, but there's a good chance Jeff and others already tidied up the names for you.

Softcover edition of Behrens et al, Nudibranchs and Sea Slugs of the Eastern Pacific, 2022 is available now at MolaMarine.com or Amazon.
Link: https://www.molamarine.com/