Neoteleostei

The Neoteleostei is a large clade of bony fish mostly consisting of marine clades. Only three lineages have freshwater species: Percopsiformes (Troutperches), which lives exclusively in freshwater, Gadiformes (cods), which is largely marine except from burbot that live in freshwater and a few populations of cod in brackish water,  and the Percomorpha, which in addition to several marine groups also have many freshwater forms.

The remaining members of Neoteleostei are marine: The populous clade of the Acanthopterygii which consist of the Beryciformes, Holocentridae and the aforementioned Percomorpha (which include families such as the tuna, seahorses, gobies, cichlids, flatfish, wrasse, perches, anglerfish, pufferfish), the Ateleopodidae (jellynoses), the Lampriformes (oarfish, opah, ribbonfish), the Zeiformes (dories), the Polymixiiformes (beardfish), the Stylephorus, the Myctophiformes (lanternfish), and the Aulopiformes (lizardfish) which include some brackwater species (also the marine order Stomiiformes was once included in the Neoteleostei as part of the superorder Stenopterygii, but have since been placed in Stomiati outside the Neoteleostei).

The swim bladder, when present, is physoclistous, a trait also shared with the non-neoteleostei orders Argentiniformes and Stomiiformes.

Neoteleostei have also lost the enzymes NOS2 and NOS3, the latter a trait they share with the rest of the Clupeocephala and possibly the Latimeria (NOS2 and NOS3 have also yet to be detected in Elopomorpha).