Arctonoe pulchra

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Red commensal scaleworm:
Red commensal scaleworm (Arctonoe pulchra): Much less common than Red-banded commensal scaleworm (Arctonoe vittata), but still quite a normal sight on the California sea cucumber (Parastichopus californicus), and an unusual find on other hosts. This species is most easily recognized when it is brick-red and living on California sea cucumber (Parastichopus californicus), but when it is paler and living on other hosts, it can still be identified by the absence of the dark band of Red-banded commensal scaleworm (Arctonoe vittata), or of the ruffled elytra margins of Arctonoe fragilis.

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