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Hexabranchus pulchellus Pease, 1860
 
Hexabranchus pulchellus: annal papilla
 
anal papilla
shows a close-up of the the anal papilla and nephridiopore (small opening on the right) in the center of the circle of gills (dark-phase animal)

Photo:
  Bruce W.: Maipoina Beach Park, Maui; Sept. 5, 2018.
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