Ocenebra lurida (Middenforff, 1849)
Common Name: Lurid Rock Snail
|(Ocenebra lurida found at Northwest Island)|
|(Photo by: Nathaniel Charbonnsau June 25, 02)|
How to Distinguish from Similar Species:
Geographical Range: Ranges from Sitka (Alaska) to Punta Santo Tomas (Baja California).
Depth Range: Low intertidal zones, but in southern California they are found sublittorally.
Habitat: Commonly found on and under rocks and in crevices.
Biology/Natural History: This species is commonly found clinging to rocks. It has been observed feeding on gumboot chitons, where it uses its radula to cut through the dark outer layers on the dorsal surface of the chiton's girdle in order to eat the yellow tissue beneath. It does not kill the chitons, but it is common to see chitons with large grooves eaten out of their girdles. "Growth records are sparse, but indicate mean growth rates of 0.5-0.7 mm per month in the field.
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Kozloff, 1987 Marine Invertebrates of the Pacific Northwest. University of Washingtion Press.
Morris et al., 1980. Intertidal Invertebrates of California. Stanford University Press.