Seanet High Intertidal

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Littorina scutulata Gould,1849
Phylum Mollusca, Cl. Gastropoda, Subcl. Orthogastropoda, Superorder Caenogastropoda, O.Sorbeoconcha, F. Littorinidae

Periwinkle; shell smooth 13-18 mm, brown, olive, or black overlaid with white checkerboard pattern; aperture less than half length of shell & lacks white stripe on interior; columella narrow & not polished; cephalic tentacles with transverse black bands.

Abundant, high & mid-intertidal zones among algae & barnacles, exposed & protected outer coast; browses on microalgae, lichens, macroalgae, & drift.

Geo Range: Sitka Alaska to Baja
Similar species: Littorina plena has longitudinal black stripe on cephalic tentacles, fine spiral grooves on shell & light stripe on interior of aperture; Littorina keenae is larger, has a white stripe on inside of aperture & has a wider columella w. a flattened parietal area.  Must examine reproductive structures to distinguish species.