Proteocephalus pinguis parasitizes pike (how about them P's??). These are tapeworms (cestodes) that alternate between their fish hosts and copepod intermediate hosts. They have extremely simple scoleces and are small even as adults. The genus contains many other species that have similar life cycles, alternating between vertebrates and copepods. If the first vertebrate host gets gobbled up by a bigger one, then the tapeworms simply infect this host instead.
The photo is from this website.
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