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Family Eulimidae

HAWAII

Stilifer linckiae

Gall below, Palea Point, Oahu, 30 feet

LINCKIA GALL SHELL

Swollen galls on Spotted sea stars are inhabited by several white snails.  They suck bodily fluids from the host and release gametes through tiny pores.  Attains 8mm.  Hawaii & the Indo-Pacific.  The white lump on the sea star's crawling surface (topside in photo) is the Parasitic Cap Shell, Thyca crystallina.