Photo & copyright by: Gary McDonald, Aromas, California, USA

Hermissenda crassicornis (Eschscholtz, 1831) [Cavolina]
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Photo details:
size: ~20 mm
depth: 0 m, intertidal 
date: 23 November 2007
country: USA, California 
location: Monterey County
divesite: Carmel Point,
photo made in the lab
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Hermissenda crassicornis
 
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Hermissenda crassicornis