bony fish synbranchiform fish Synbranchiformes is an order of ray-finned fishes that are eel-like but have spiny rays, indicating that they belong to the superorder *Acanthopterygii*. There are two suborders: *Synbranchoidei* and *Mastacembeloidei*, or *Opisthomi*. The *Synbranchoidei* has one family, the *Synbranchidae*, four genera, and 17 species. The *Mastacembeloidei* has two families: *Chaudhuriidae*, with four genera and five species, and *Mastacembelidae*, with three genera and about 26 species. chaudhuriidae mastacembelidae swamp eel synbranchidae requires discussion