Parent: Alcidae (Auks)

└─ Synthliboramphus (Ancient murrelets)

└─── Synthliboramphus antiquus (Ancient murrelet)

└─── Synthliboramphus craveri (Craveri's murrelet)

└─── Synthliboramphus hypoleucus (Xantus' murrelet)

└─── Synthliboramphus wumizusume (Japanese murrelet)