Synbranchiformes

Macrognathus aculeatus

Synbranchiformes: Body elongate; pelvic fins absent; gill openings confined to lower half of body; ectopterygoid enlarged; mesopterygoid reduced or absent; premaxillary nonprotrusible and without ascending process. All species except three occur in freshwater.

• See Fishbase.

Families in this order:

• Chaudhuriidae
• Mastacembelidae
• Synbranchidae