plural noun

Definition of Proteocephalidae 

: a family of tapeworms that are parasites of fishes, have scolices resembling those of members of the Cyclophyllidae and reproductive organs like those of members of the Tetraphyllidea, and are sometimes placed in either of these orders but now more usually isolated in a separate order

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History and Etymology for Proteocephalidae

New Latin, from Proteocephalus, type genus + -idae

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to move with a clumsy heavy tread

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