Siphonognathus

Siphonognathus is a genus of ray-finned fish, weed whitings in the family Odacidae which are endemic to Southern Australian coastal waters. They are sometimes called tube-finned fish, thanks to their tubular appearance. These fish are characterized by their extremely elongate bodies and live primarily in seagrass beds.
Species.
There are currently six recognized species in this genus:
They were formerly placed in separate genera. They placed "S. attentuatus", "S. beddomei", "S. radiatus" and "S. tanyourus" in the separate genus "Sheardichthys" and "S. caninis" on the monospecific genus "Parodax", leaving "Siphonognathus" as a monospecific genus containing only the tubemouth ("S. argyrophanes").