Aplidium solidum (Ritter and Forsyth, 1917)
Common name(s): Red ascidian, Sea pork
|Synonyms: Amaroucium solidum|
|Aplidium solidum under an overhanging boulder at Cape Flattery. Diameter about 10 cm|
|(Photo by: Dave Cowles July 2008)|
How to Distinguish from Similar Species: Aplidium californicum also forms a gelatinous or fleshy colony with zooids in systems but the zooids are tan, yellowish, or orange-brown and usually have less stigmata on the pharynx. Archidistoma molle can be reddish or pink (with red dots) but the zooids are not in systems and the colony tends to be globular in form.
Geographical Range: Southern British Columbia to San Diego, CA
Depth Range: Intertidal to 40 m
Habitat: Rocks and pilings in areas with current.
Biology/Natural History: In California, colonies of this species can grow to 7 cm diameter in 3 months. The larvae are brooded in the atrial cavity in spring and summer.
The symbiotic copepod Arthurhumesia
canadensis may be present inside the zooids. The amphipod Polycheria
osborni is also a rare symbiont. The nudibranch Hermissenda
crassicornis often feeds on the zooids.
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Lamb and Hanby, 2005
Morris et al., 1980
General Notes and Observations: Locations,
abundances, unusual behaviors: