Barentsia robusta Osburn, 1955
Common name(s): Nodding heads
|Barentsia robusta, about 1 mm tall, growing on the plate of a subtidal barnacle. The stalks and base are partly covered by attached diatoms and other debris.|
|(Photo by: Dave Cowles, July 2008 )|
How to Distinguish from Similar Species: Other local entoproct species are not connected by stolons, or thick or have branching stalks, or have several bendable enlargements along the stalk.
The muscular enlargements at the base of Barentsia entoprocts allow the
stalks to bend at that point, and they seem to frequently "flick" themselves
by bending at the base. Unlike bryozoans, their tentacles cannot
retract back into the calyx. Instead, they fold down horizontally
across the center of the calyx like the petals of a flower when it closes.
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General Notes and Observations: Locations, abundances, unusual behaviors: