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Hexabranchus sandwichensis (Gray, 1850)

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.
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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.
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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.
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dark, transitioning
shows an animal transitioning to the dark phase
Photo: PF: Wahikuli, Maui; Nov. 6, 2010.
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