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Hexabranchus sandwichensis (Gray, 1850)
 
Hexabranchus sandwichensis: dark
 
dark
shows an unusually dark animal that lacks mottling on the notum and white rings on the bases of the rhinophores (the lumpy surface, red rhinophore clubs and branchia confirm it as H. sandwichensis rather than a solid-red H. aureomarginatus)

Photo:
  Alex Dutcher: PK's Bay, Kauai; July 20, 2018.

Hexabranchus sandwichensis: dark, mantle spread
 
dark, mantle spread

shows an unusually dark animal with the mantle spread (gill color confirms it as H. sandwichensis)

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

Hexabranchus sandwichensis: dark, transitioning
 
dark, transitioning

shows an animal transitioning to the dark phase

Photo:
  PF: Wahikuli, Maui; Nov. 6, 2010.
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