Parent: Onychoprion

└─ Onychoprion fuscatus (Sooty tern)

└─── Onychoprion fuscatus crissalis

└─── Onychoprion fuscatus fuscatus

└─── Onychoprion fuscatus kermadeci

└─── Onychoprion fuscatus luctuosus

└─── Onychoprion fuscatus nubilosus

└─── Onychoprion fuscatus oahuensis

└─── Onychoprion fuscatus serratus