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Hexabranchus sandwichensis (Gray, 1850)
 
Hexabranchus sandwichensis: dark
 
dark
shows an 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 a 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, yellow submarginal band

Hexabranchus sandwichensis: dark, yellow submarginal band 
 
dark, yellow submarginal band

shows a dark animal with a yellow submarginal band (gill color confirms it as H. sandwichensis); animal stranded in intertidal when found

Photo:
  John LaBar: about 140 mm: Wawaloli Beach Park, Big Island; March 31, 2025.

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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