Toward an atlas of Salish Sea biodiversity: the flora and fauna of Galiano Island, British Columbia, Canada. Part I. Marine zoology Author Simon, Andrew D. F. https://orcid.org/0000-0002-5358-8974 Institute for Multidisciplinary Ecological Research in the Salish Sea, Galiano Island, Canada adfsimon@imerss.org Author Adamczyk, Emily M. Institute for Multidisciplinary Ecological Research in the Salish Sea, Galiano Island, Canada & University of British Columbia, Vancouver, Canada Author Basman, Antranig Institute for Multidisciplinary Ecological Research in the Salish Sea, Galiano Island, Canada Author Chu, Jackson W. F. https://orcid.org/0000-0002-7776-9446 University of Victoria, Victoria, Canada Author Gartner, Heidi N. Royal British Columbia Museum, Victoria, Canada Author Fletcher, Karin Port Orchard 98366, Port Orchard, United States of America Author Gibbs, Charles J. Pacific Marine Life Surveys, Port Coquitlam, Canada Author Gibbs, Donna M. Pacific Marine Life Surveys, Port Coquitlam, Canada Author Gilmore, Scott R. 7494 Andrea Cres, Lantzville, Canada Author Harbo, Rick M. Royal British Columbia Museum, Victoria, Canada Author Harris, Leslie H. Natural History Museum of Los Angeles County, Los Angeles, United States of America Author Humphrey, Elaine Institute for Multidisciplinary Ecological Research in the Salish Sea, Galiano Island, Canada & University of Victoria, Victoria, Canada Author Lamb, Andy Pacific Marine Life Surveys, Port Coquitlam, Canada Author Lambert, Philip Royal British Columbia Museum, Victoria, Canada Author McDaniel, Neil McDaniel Photography, Vancouver, Canada Author Scott, Jessica Ocean Wise, Vancouver, Canada Author Starzomski, Brian M. University of Victoria, Victoria, Canada text Biodiversity Data Journal 2022 2022-03-10 10 76050 76050 http://dx.doi.org/10.3897/BDJ.10.e76050 journal article http://dx.doi.org/10.3897/BDJ.10.e76050 1314-2828-10-e76050 440282C625BD5D90A9623563DB6850F5 Entoprocta Nitsche, 1869 Notes [ 1 class: 1 order: 1 family: 1 genus: 1 species ] ' Entoprocta ' derives from the Greek ἐντός (entos), meaning "inside" , and πρωκτός (prōktos), meaning "anus." Entoprocta (nodding-heads) are a small phylum of mainly sessile marine invertebrates that comprises 253 described species worldwide ( WoRMS Editorial Board 2021 ). The phylum was traditionally divided into two orders: the Solitaria and Coloniales . Solitaria included solitary species that usually attach to larger organisms which produce feeding currents, such as sponges, bryozoans, polychaetes, sipunculans and ascidians, and are typically associated with just one or a few host species. Coloniales , by contrast, included colonial species that form crusts on various surfaces. However, the traditional system is no longer followed; instead four families are now recognised ( WoRMS Editorial Board 2021 ). Of the 11 species known to British Columbia ( Baldwin 2009e ), one species is reported for Galiano Island: Barentsia sp. (Hincks, 1880) (Fig. 14 ). Entoprocts are filter feeders, trapping small particles in the mucus secreted by their tentacles. An understudied group, they are easily overlooked because of their diminutive size (<1 mm) and the superficial similarities they share with the Cnidaria and Bryozoa ( Ruppert et al. 2004 ). With further search effort, others are likely to be detected locally. The body plan of entoprocts consists of a cup-like Heterochone calyx that bears a ring of ciliated tentacles called -the lophophore, which is attached on its dorsal surface to the substrate by a long, thin stalk or pedicel. Entoprocta have their anus inside their ring of tentacles, while bryozoans (formally known as the Ectoprocta ), have their anus outside of their ring of tentacles. Regionally occurring Entoprocta are treated by Kozloff (1996) , Lamb and Hanby (2005) , Carlton (2007) and Baldwin (2009e) . For annotated records of entroprocts reported for Galiano Island, see supplementary materials (Suppl. material 12).