Parent: Laridae (Gulls)

└─ Onychoprion

└─── Onychoprion aleuticus (Aleutian tern)

└─── Onychoprion anaethetus (Bridled tern)

└─── Onychoprion fuscatus (Sooty tern)

└─── Onychoprion lunatus (Spectacled tern)