Seanet High Intertidal

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Chlorostoma funebralis S (A.Adams, 1855)
Phylum Mollusca, Class Gastropoda, Subcl. Orthogastropoda, Superorder Vetigastropoda, Family Trochidae

Black turban snail. Conical rounded shell to 30 mm, charcoal to purplish-black; apex usually eroded to gold & white. Umbilicus closed (arrow); low spiral ridge around center of base ends in a notch & tooth on inner edge of aperture (inset). Foot & head black.

Abundant throughout mid-intertidal zone and lower portion of high zone, protected outer coast; large aggregations shelter in crevices at low tide; herbivorous.

Geo Range: Vancouver Island to Baja
Synonyms: Tegula funebralis
Similar species: Chlorostoma brunnea is similar but has light brown shell (usually covered with dark red non-coralline algal crust) & it occurs lower on the shore down into the subtidal.

Image: dark crust is Petrocelis phase of Mastocarpus.