Opihis are Limpets or Marine snails found on rocky shores throughout the world. Hawaii's species are endemic, found here and no where else! The 3 most common species of Opihis are; the "blackfoot" ‘opihi (Cellana exarata) which occurs on basalt shorelines, from the splash zone high on the shore, seaward. The "green foot" (Cellena Sandwicences) located to the level of low tide where crust-like pink calcareous algae forms a band on the rocks. And the yellow foot (Cellena Talcosa) found just below the water level at low tide.
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