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From: Webster's Revised Unabridged Dictionary (1913)

 Si·pho·no·stom·a·ta n. pl.  Zool. (a) A tribe of parasitic copepod Crustacea including a large number of species that are parasites of fishes, as the lerneans. They have a mouth adapted to suck blood. (b) An artificial division of gastropods including those that have siphonostomatous shells.