It is sometimes reported that the lurid rocksnail is in fact the gumboot chiton's only predator, but others list such animals as the sea star " Pisaster ochraceus ", some octopus species,
12.
These two species have different aboral spines and coloration which allows one to distinguish between the species . " Evasterias troscheli " may be confused with " Pisaster ochraceus " at times as well.
13.
It can be distinguished by its smaller disk size and longer, tapering rays which are often thickest a short distance out from their base rather than at the base as in " Pisaster ochraceus ".
14.
This species of seastar is often considered a keystone species in many intertidal regions . " Pisaster ochraceus " is a predator of the California mussel, " Mytilus californianus " and reduces its abundance.
15.
Mussels hold their valves together very securely but " Pisaster ochraceus " can insert part of its everted stomach, or some digestive juices, through the narrow gap that exists where the byssal threads emerge from the shell.
16.
Two species that can be mistaken for " Pisaster ochraceus " are " Pisaster giganteus ", which has blue rings around white or purple spines, and " Pisaster brevispinus ", which is pink with small white spines.
17.
Snails displayed a flight response with movement rates up to 10 cm / min, often accompanied by shell twisting, between 70 % and 100 % of the time after contact with the following predatory seastars : " Leptasterias hexactis ", " Pycnopodia helianthoides ", " Pisaster ochraceus ", and " Evasterias troscheli ".
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