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Three families inhabiting Korean waters AFerosagittarobusta (Sagittidae) BPterosagittadraco; CKrohnittasubtilis (Krohnittidae). Abbreviations: AF = anterior fin; CC = corona ciliata; COL = collarette; CF = caudal fin; E = eye; GS = grasping spine; LF = lateral fin; PF = posterior fin; SV = seminal vesicle; VG = ventral ganglion.
