Olfactores

Olfactores Temporal range: Cambrian Stage 3–Present, 518–0 Ma[1] PreꞒ Ꞓ O S D C P T J K Pg N (Possible Ediacaran record, 557 Ma[2])
Example of Olfactores
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Subkingdom:	Eumetazoa
Clade:	ParaHoxozoa
Clade:	Bilateria
Clade:	Nephrozoa
Superphylum:	Deuterostomia
Phylum:	Chordata
Clade:	Olfactores Jefferies, 1991
Subphyla
Tunicata Vertebrata (Craniata)

Olfactores is a clade within the Chordata that comprises the Tunicata (Urochordata) and the Vertebrata (sometimes referred to as Craniata). Olfactores represent the overwhelming majority of the phylum Chordata, as the Cephalochordata are the only chordates not included in the clade. This clade is defined by a more advanced olfactory system which, in the immediate vertebrate generation, gave rise to nostrils.