A sexually parasitized female of the deep-sea ceratioid anglerfish Centrophryne spinulosa is described for the first time, bringing the number of ceratioid species known to exhibit sexual parasitism to 24 and the number of ceratioid families to six. The attached pair represents the largest known individuals of both sexes. The extreme and puzzling rarity of parasitized females in some of the best known ceratioid species is discussed. While it has been hypothesized that some ceratioid taxa reproduce solely by temporary male–female attachment, it now seems reasonable to expect the eventual discovery of parasitized females in any of the remaining ceratioid taxa.

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