Fish suborders

Macrouroidei is a suborder of deep sea fish, a diverse and ecologically important group, which are part of the order of cod-like fish, the Gadiformes. The species in the Macrouroidei are characterised by their large heads which normally have a single barbel on the chin, projecting snouts, and slender bodies that taper to whip-like tails, without an obvious caudal fin but what there is of the caudal fin is often confluent with the posterior dorsal and anal fins. There are normally two dorsal fins, the anterior dorsal fin is quite high, the posterior quite low but is longer and takes up a greate

Callionymoidei is a suborder of syngnathiform fish containing two families, the dragonets Callionymidae and the Draconettidae. In the past, this group was treated as either the suborder Callionymoidei of the wider Perciformes (now known to be a paraphyletic treatment), or as a distinct order Callionymiformes. Nelson (2016) recognised it as a distinct oder but subsequent workers have suggested that if Callionymiformes is recognised as an order then the order Syngnathiformes is rendered paraphyletic and include Callionmyoidei within that taxon. It is presently considered a suborder of Syngnathif

Brachythoraci is an extinct suborder of arthrodire placoderms, armored fish most diverse during the Devonian.

Ceratioidei, the pelagic anglerfishes or deep-sea anglerfishes, is a suborder of marine ray-finned fishes, one of five suborders in the order Lophiiformes, the anglerfishes. These fishes are found in tropical and temperate seas throughout the world, living above the bottom of the deep sea, in the pelagic zone. The esca, the defining feature of all anglerfish groups, are bioluminescent in the deep-sea anglerfishes, attracting prey in the vast darkness of the bathypelagic zone which they inhabit.

Sclerorhynchoidei is an extinct suborder of rajiform rays that had long rostra with large denticles similar to sawfishes and sawsharks. This feature was convergently evolved, recently proposed as 'pristification', and their closest living relatives are actually skates. While they are often called "sawfishes", sawskates is a more accurate common name proposed in 2021 for sclerorhynchoids, which has been subsequently used by other researchers.

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