Nomeus gronovii
Date 1700-1880
Source/Photographer Iconographia Zoologica
Old Latin name Nomeus gronovii
New Latin name Nomeus gronovii
Common name Nederlands: Oorlogsschipvisje
Source: https://commons.wikimedia.org/wiki/File:Nomeus_gronovii_-_1700-1880_-_Print_-_Iconographia_Zoologica_-_Special_Collections_University_of_Amsterdam_-_UBA01_IZ13500267.tif

The man-of-war fish or bluebottle fish (Nomeus gronovii) is a species of fish in the family Nomeidae, the driftfish. It is native to the Atlantic, Pacific and Indian Oceans. It is notable for its ability to live within the deadly tentacles of a siphonophore, the Portuguese man o' war, upon whose tentacles and gonads it feeds.