Contents: Introduction. Higher classification of Nepomorpha. Synoptic list of infraorder nepomorpha. 1. Superfamily: Nepoidea. i. Family: Nepidae. ii. Family: Belostomatidae. 2. Superfamily: Ochteroidea: i. Gelastocoridae. ii. Family: Ochteridae. 3. Superfamily: Corixoidea: i. Family: Corixidae. 4. Superfamily: Naucoroidea: i. Family: Aphelocheiridae. ii. Family: Naucoridae. 5. Superfamily: Notonectoidae: i. Family: Notonectidae. 6. Superfamily: Pleoidea: i. Family Pleidae. ii. Family: Helotrephidae. Discussion. Acknowledgements. References.