Catriona columbiana, the British Columbia aeolid, is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Trinchesiidae.Gofas, S. (2016). Tenellia columbiana (O'Donoghue, 1922). In: MolluscaBase eds. (2026). MolluscaBase. Tenellia columbiana (O'Donoghue, 1922). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=890620 on 2026-03-03Korshunova T.; Fletcher K.; Martynov A. (2025). The endless forms are the most differentiated—how taxonomic pseudo-optimization masked natural diversity and evolution: the nudibranch case Zoological Journal of the Linnean Society, Volume 204, Issue 4, August 2025, zlaf057,
Distribution This species was described from Gabriola Pass, Nanaimo, Vancouver Island, British Columbia, Canada. has been recorded along the Eastern Pacific coastline of North America from Cutter Rock, Ketchikan, Alaska, to San Diego, California.McDonald, G. (2015). Catriona columbiana (O'Donoghue, 1922) Intertidal Invertebrates of the Monterey Bay Area, California.Rudman, W.B., 2000 (June 11) Cuthona columbiana (O'Donoghue, 1922). [In] Sea Slug Forum. Australian Museum, Sydney.
Ecology Catriona columbiana feeds on the athecate hydroids Tubularia and Syncoryne.
References