Pacific Coast of N. America, from Oregon to Monterey Bay, California.
In high intertidal pools on submerged tips of Cladophora columbiana, Seal Rock State park, Lincoln County, Oregon. June-July 1990. Photos: Cynthia Trowbridge.
Body dull yellowish brown with darker pigment in central region. Grows to approx 5mm in length.
See Cynthia Trowbridge's message below.
• Gosliner, T.M. (1991). Four new species and a new genus of opisthobranch gastropods from the Pacific coast of North America. The Veliger, 34(3): 272-290.
Rudman, W.B., 2001 (April 30) Runcina macfarlandi Gosliner, 1991. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/runcmacf