Dirona albolineata Mac Farland in Cockerell & Eliot, 1905 (or Eliot, 1905)
Common name(s): White-lined Dirona, Frosted nudibranch, Alabaster nudibranch, Chalk-lined dirona
|Dirona albolineata from Coffin Rocks, depth about 12 m.|
|(Photo by: Kirt Onthank, summer 2007)|
How to Distinguish from Similar Species: The cerata on many Arminaceans such as this species often make them look a lot like Eolid nudibranchs, but they can be distinguished from Eolids because Arminaceans have the anus on a papilla on the rear third of the body (right side) while Eolids have it on the anterior third of the body (right side). Dirona aurantia has similar-shaped cerata but the overall color is orange, it has no white line on its frontal veil, on its tail, or between its cerata, and it has scattered white spots.
Geographical Range: Kachemak Bay, Alaska to San Diego, CA; Japan, East Russia
Depth Range: Intertidal to 37 m.
Habitat: Usually on rocks, occasionally on mud
Biology/Natural History: The cerata
fall off easily. Feeds on small snails such as Margarites
pupillus and Lacuna carinatus
by cracking the shells with its jaws. Also feeds on sea anemones,
and bryozoans (photo). Their egg
mass contains about 350,000 eggs.
|Main Page||Alphabetic Index||Systematic Index||Glossary|
Brusca and Brusca, 1978
McDonald and Nybakken, 1980
Morris et al., 1980
Ricketts et al., 1985
General Notes and Observations: Locations,
abundances, unusual behaviors:
This individual is grazing on a bryozoan. Photo by Kirt Onthank, summer 2007
|This nudibranch exists in several color variations. For example, the two nudibranchs below were found at a minus tide on Sares Head in late October, 2007. Although Kozloff's key says this species is not orange, these two individuals are marked just like D. albolineata and NOT like D. aurantia yet they have orange on them. Perhaps the orange comes from something they have been eating (note that one is orange mainly in the cerata in one individual) or could they be eggs? Photos by Dave Cowles, October 2007|
This individual is crawling along the edge of a tide pool at low tide, Cape Flattery. Photo by Dave Cowles, July 2008