I love phylogenetics because you expect something like this (Tarpon)
To be related to this (Milkfish, or herring in general)
But turns out it’s more closely related to eels (due to a stroke of luck that most of their other relatives presumably died out, therefore their respective orders and only a handful of other make up the extant survivors). (Pic: European Eel)
And you’d expect these (Anthias: Hawk Anthias and Lyretail Anthias)
To be related to this (Chromis, or damselfish in general)
But they’re actually related to groupers (Goliath Grouper)