Seanet Subtidal

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Promartynia pulligo  (Gmelin, 1791)
Phylum Mollusca, Class Gastropoda, Subcl. Orthogastropoda, Superorder Vetigastropoda, Family Trochidae

Conical smooth shell to 30 mm; whorls & base more rounded than C. montereyi but not as rounded as C. brunnea. Inner edge of aperture a flange that separates it from open umbilicus (arrow); base of shell & inner lip of aperture smooth, lacking ridge, notch or tooth (inset). Side of foot black with faint pale lines & pale margin.

Very abundant, on rocks, low-lying algae, & giant kelp. Herbivorous.

Geo Range: Sitka Alaska to Baja
Synonyms: Tegula pulligo
Similar species: 
Chlorostoma brunnea is more round, lacks open umbilicus; Chlorostoma montereyi has fine spiral striations on shell & edge of open umbilicus spirals upward toward apex.

Image: Garnotia adunca (on shell).