A Conus californicus Reeve, 1844 is reported killing and attempting to feed on the nudibranch Triopha catalinae (Cooper, 1863). This is the first documented case of a predatory cone killing a nudibranch. The impact of cone attacks on nudibranchs populations is unknown, but this note may lead to further research on this topic. Because conotoxins appear to have an effect on the nudibranch nervous system further research on the interaction between conotoxins and nudibranchs could be a source of important discoveries.
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