Summary description from Wikipedia:

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Parent Taxon

• Unionidae

Sibling Taxa

• Actinonaias
• Arotonaias
• Atlanticoncha
• Cambarunio
• Cyprogenia
• Cyrtonaias
• Delphinonaias
• Disconaias
• Dromus
• Ellipsaria
• Epioblasma
• Friersonia
• Glebula
• Hamiota
• Lampsilis
• Leaunio
• Lemiox
• Ligumia
• Medionidus
• Obliquaria
• Obovaria
• Ortmanniana
• Pachynaias
• Paetulunio
• Potamilus
• Ptychobranchus
• Sagittunio
• Toxolasma
• Truncilla
• Venustaconcha
• Villosa

Child Taxa

• Toxolasma corvunculus
• Toxolasma cylindrellum
• Toxolasma lividum
• Toxolasma parvum
• Toxolasma paulum
• Toxolasma pullum
• Toxolasma texasiense

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