A generalist predator of small opisthobranchs, including nudi-branchs and other soft-bodied invertebrates. Attacks prey up to 5-6 times its body weight. Some of the prey species secrete toxins, which it can tolerate at low levels, including compounds found in sponges, cnidarians, bryozoans, and opisthobranchs. One of its main food sources, juvenile sea hares, secretes ink that contains toxins when attacked. If the sea spider comes into contact with the toxic deterrent, it will vigorously wave the affected limb.
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