Summary description from Wikipedia:

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Parent Taxon

• Hydrophilidae

Sibling Taxa

• Adolopus
• Andotypus
• Anticura
• Austrotypus
• Borborophorus
• Coelostomopsis
• Cyloma
• Cylomissus
• Cylorygmus
• Enigmahydrus
• Eurygmus
• Exydrus
• Hydrostygnus
• Petasopsis
• Pseudohydrobius
• Relictorygmus
• Rygmodus
• Rygmostralia
• Saphydrus
• Tormissus

Child Taxa

• Rygmodus alienus
• Rygmodus antennatus
• Rygmodus cyaneus
• Rygmodus femoratus
• Rygmodus incertus
• Rygmodus longulus
• Rygmodus modestus
• Rygmodus oblongus
• Rygmodus opimus
• Rygmodus pedinoides
• Rygmodus tibialis

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