Kaup's arrowtooth eel
The Kaup's arrowtooth eel ( "Synaphobranchus kaupii" , also known as the Kaup's cut-throat eel , the Gray's cutthroat , the Longnosed eel , the Northern cutthroat eel , or the Slatjaw cutthroat eel ) is an eel in the family Synaphobranchidae ( cutthroat eels ) . 
<triplet> Synaphobranchidae <subj> eel <obj> parent taxon