How to Distinguish from Similar Species: The large dark rings make this dorid easy to distinguish. However, it is very similar to another species, Discodoris heathi, which has spots instead of rings. In my observations, spots seem to grade into rings. Geographical Range: Alaska south to Puerto Penasco, Mexico Depth Range: Low intertidal and subtidal to 35 m. Mostly intertidal in the north, subtidal in the south Habitat: Rocky intertidal, surge channels Biology/Natural History: Feeds on Halichondria, Haliclona, Myxilla, and Petrosia sponges. The egg ribbon is narrow, white, attached in an oval spiral under rock ledges by one margin. According to Baltzley et al., (2011), many gastropods, including this species, have a special network of pedal ganglia in their foot which assists in crawling. The two main neurons involved produce pedal peptides which elicit an increase in the rate of beating of cilia on the foot, resulting in crawling.
References:Dichotomous Keys:Kozloff 1987, 1996 Smith and Carlton, 1975 General References:
Scientific Articles:
General Notes and Observations: Locations, abundances, unusual behaviors:
A pair at Cape Flattery. Photo by Dave Cowles Authors and Editors of Page: Dave Cowles (2005): Created original page |